95973811 GPS Tracking System Project Report

GPS TRACKING SYSTEM

(1)INTRODUCTION
(1.1) WHAT IS GPS TRACKING SYSTEM?
A GPS tracking unit is a device that uses the Global Positioning System to determine
the precise location of a vehicle, person, or other asset to which it is attached and to
record the position of the asset at regular intervals. The recorded location data can be
stored within the tracking unit, or it may be transmitted to a central location data
base, or internet-connected computer, using a cellular (GPRS), radio, or satellite
modem embedded in the unit. This allows the asset's location to be displayed against
a map backdrop either in real-time or when analysing the track later, using
customized software.
A GPS tracking system uses the GNSS (Global Navigation Satellite System)
network. This network incorporates a range of satellites that use microwave signals
which are transmitted to GPS devices to give information on location, vehicle speed,
time and direction. So, a GPS tracking system can potentially give both real-time and
historic navigation data on any kind of journey.
A GPS tracking system can work in various ways. From a commercial perspective,
GPS devices are generally used to record the position of vehicles as they make their
journeys. Some systems will store the data within the GPS tracking system itself
(known as passive tracking) and some send the information to a centralized database
or system via a modem within the GPS system unit on a regular basis (known as
active tracking).
 A PASSIVE GPS TRACKING SYSTEM will monitor location and
will store its data on journeys based on certain types of events. So, for
example, this kind of GPS system may log data such as turning the ignition
on or off or opening and closing doors. The data stored on this kind of GPS
tracking system is usually stored in internal memory or on a memory card
which can then be downloaded to a computer at a later date for analysis. In

GPS TRACKING SYSTEM

some cases the data can be sent automatically for wireless download at
predetermined points/times or can be requested at specific points during the
journey.
 AN ACTIVE GPS TRACKING SYSTEM is also known as a real-time
system as this method automatically sends the information on the GPS
system to a central computer or system in real-time as it happens. This kind
of system is usually a better option for commercial purposes such as fleet
tracking and individual vehicle tracking as it allows the company to know
exactly where their vehicles are, whether they are on time and whether they
are where they are supposed to be during a journey. This is also a useful way
of monitoring the behavior of employees as they carry out their work and of
streamlining internal processes and procedures for delivery fleets.

(1.2) WHAT IS GPS?
The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting
satellites (24 in operation and three extras in case one fails). The U.S. military
developed and implemented this satellite network as a military navigation system,
but soon opened it up to everybody else.
Each of these 3,000- to 4,000-pound solar-powered satellites circles the globe at
about 12,000 miles (19,300 km), making two complete rotations every day. The
orbits are arranged so that at any time, anywhere on Earth, there are at least four
satellites "visible" in the sky.
A GPS receiver's job is to locate four or more of these satellites, figure out the
distance to each, and use this information to deduce its own location. This operation
is based on a simple mathematical principle called trilateration.

GPS TRACKING SYSTEM

(Photo courtesy U.S. Department of Defense Artist's concept of the GPS satellite constellation)

Figure (1.2.1)
In order to make the simple calculation of the location, then, the GPS receiver has to
know two things:


The location of at least three satellites above you



The distance between you and each of those satellites

(Photo courtesy Garmin The Street Pilot II, a GPS receiver with built-in maps for drivers)

Figure (1.2.2)
The GPS receiver figures both of these things out by analyzing high-frequency, lowpower radio signals from the GPS satellites. Better units have multiple receivers, so
they can pick up signals from several satellites simultaneously.
You can use maps stored in the receiver's memory, connect the receiver to a
computer that can hold more detailed maps in its memory, or simply buy a detailed
map of your area and find your way using the receiver's latitude and longitude

GPS TRACKING SYSTEM

readouts. Some receivers let you download detailed maps into memory or supply
detailed maps with plug-in map cartridges.
A standard GPS receiver will not only place you on a map at any particular location,
but will also trace your path across a map as you move. If you leave your receiver
on, it can stay in constant communication with GPS satellites to see how your
location is changing. With this information and its built-in clock, the receiver can
give you several pieces of valuable information:
 How far you've traveled (odometer)
 How long you've been traveling
 Your current speed (speedometer)
 Your average speed
 A "bread crumb" trail showing you exactly where you have traveled on the
map
 The estimated time of arrival at your destination if you maintain your current
speed

(1.3) TYPES OF GPS TRACKING SYSTEM:
Three Types of GPS Tracking Units are there.
There are currently three categories of GPS tracking units. The categories are split
into how GPS data is logged and retrieved.

Data Loggers
Data loggers are usually the most basic type of GPS tracking; a GPS data logger
simply logs the position of the object at regular intervals and retains it in an internal
memory. Usually, GPS loggers have flash memory on board to record data that is
logged. The flash memory can then be transferred and accessed using USB or
accessed on the device itself. Usually data loggers are devices used for sports and
hobby activities. They might include devices that help log location for hikers, bikers
and joggers.

GPS TRACKING SYSTEM

Data Pushers
Data Pushers are GPS tracking units that are mainly used for security purposes. A
data pusher GPS tracking unit sends data from the device to a central database at
regular intervals, updating location, direction, speed and distance.
Data pushers are common in fleet control to manage trucks and other vehicles. For
instance, delivery vehicles can be located instantly and their progress can be tracked.
Other uses include the ability to track valuable assets. If valuable goods are being
transported or even if they reside in a specific location, they can constantly be
monitored to avoid theft.
Data pushers are also common for espionage type tasks. It is extremely easy to watch
the movements of an individual or valuable asset. This particular use of GPS tracking
has become an important issue in the field of GPS tracking, because of its potential
for abuse.

Data Pullers
The last category of GPS tracking units is the data pusher units. These types of units
push data or send data when the unit reach a specific location or at specific intervals.
These GPS units are usually always on and constantly monitoring their location.
Most, if not all data puller unit also allow data pushing (the ability to query a
location and other data from a GPS tracking unit).

(1.4) FEATURES OF THE GPS TRACKING SYSTEM:
Generally all of the GPS Tracking System has some of the common features that are
listed below:

GSM/Gprs Module - It is used to send the location to the user online. In
some case, if the user wants the location through the internet then this module
is very useful. By the help of the GSM/GPRS module, we can send data real
time. It can be seen on the internet enabled any device as a PC, mobile phone,
PDA etc.

GPS TRACKING SYSTEM



Track Playback - Animates your driver's daily driven route so that you
can follow every move. The track animation line is color coded to indicate
the speed your driver was traveling during his route.



Idle Time Report- Gives you an accurate report detailing when your
driver was stopped and has left the engine running on the vehicle. This report
was designed with input from our existing customers who were concerned
about high fuel bills.



Track Detail - Provides you with a split screen view when reviewing your
driver's route. Stop and transit times, as well as speed information, are
displayed in the bottom pane. You can easily toggle between stops by clicking
the stop number on the track detail pane.

(1.5) GPS POSITION LOCATION PRINCIPLE:
The Global Positioning System is comprised of three segments: Satellite
constellation ground control/ monitoring network and user receiving equipment.
Formal GPS joint program office (JPO) programmatic terms for these components
are space, operational control and user equipment segments, respectively.
–

The satellite constellation contains the satellites in orbit that provide the
ranging signals and data messages to the user equipment.

GPS TRACKING SYSTEM

Figure 1.5.1
–

The operational control segment (OCS) tracks and maintains the satellites in
space. The OCS monitors satellite health and signal integrity and maintains
the orbital configuration of the satellite. Furthermore, the OCS updates the
satellite clock corrections and ephemerides as well as numerous other
parameters essential to determining user position, velocity and time (PVT).

–

The user receiver equipment performs the navigation, timing or other related
notation.

(1.6) GPS SIGNALS:
–

The satellites of the Global Positioning System (GPS) broadcast radio
signals to enable GPS receivers on or near the Earth's surface to determine
location and synchronized time. The GPS system itself is operated by the
U.S. Department of Defense for both military use and use by the general
public.

–

GPS signals include ranging signals, used to measure the distance to the
satellite, and navigation messages. The navigation messages include
ephemeris data, used to calculate the position of each satellite in orbit, and
information about the time and status of the entire satellite constellation,
called the almanac.



Basic GPS signals:

GPS TRACKING SYSTEM

The original GPS design contains two ranging codes: the Coarse/Acquisition (C/A)
code, which is freely available to the public, and the restricted Precision (P)
code, usually reserved for military applications.

a) Coarse/Acquisition code:
–

The C/A code is a 1,023 bit deterministic sequence called pseudorandom
noise (also pseudorandom binary sequence) (PN or PRN code) which,
when transmitted at 1.023 megabits per second (Mbit/s), repeats every
millisecond. These sequences only match up, or strongly correlate, when
they are exactly aligned.

–

Each satellite transmits a unique PRN code, which does not correlate well
with any other satellite's PRN code. In other words, the PRN codes are highly
orthogonal to one another. This is a form of code division multiple access
(CDMA), which allows the receiver to recognize multiple satellites on the
same frequency.

b) Precision code:
–

The P-code is also a PRN; however, each satellite's P-code PRN code is
6.1871 × 1012 bits long (6,187,100,000,000 bits, ~720.213 gigabytes) and
only repeats once a week (it is transmitted at 10.23 Mbit/s). The extreme
length of the P-code increases its correlation gain and eliminates any range
ambiguity within the Solar System. However, the code is so long and
complex it was believed that a receiver could not directly acquire and
synchronize with this signal alone. It was expected that the receiver would
first lock onto the relatively simple C/A code and then, after obtaining the
current time and approximate position, synchronize with the P-code.

–

Whereas the C/A PRNs are unique for each satellite, the P-code PRN is
actually a small segment of a master P-code approximately 2.35 × 1014 bits in

GPS TRACKING SYSTEM

length (235,000,000,000,000 bits, ~26.716 terabytes) and each satellite
repeatedly transmits its assigned segment of the master code.
–

To prevent unauthorized users from using or potentially interfering with the
military signal through a process called spoofing, it was decided to encrypt
the P-code. To that end the P-code was modulated with the W-code, a special
encryption sequence, to generate the Y-code. The Y-code is what the satellites
have been transmitting since the anti-spoofing module was set to the "on"
state. The encrypted signal is referred to as the P(Y)-code.

–

The details of the W-code are kept secret, but it is known that it is applied to
the P-code at approximately 500 kHz, which is a slower rate than that of the
P-code itself by a factor of approximately 20. This has allowed companies to
develop semi-codeless approaches for tracking the P(Y) signal, without
knowledge of the W-code itself.

(1.7)FREQUENCIES USED BY GPS SIGNALS:
–

All satellites broadcast at the same two frequencies, 1.57542 GHz (L1 signal)
and 1.2276 GHz (L2 signal). The satellite network uses a CDMA spreadspectrum technique where the low-bitrate message data is encoded with a
high-rate pseudo-random (PRN) sequence that is different for each satellite.
The receiver must be aware of the PRN codes for each satellite to reconstruct
the actual message data.

–

The C/A code, for civilian use, transmits data at 1.023 million chips per
second, whereas the P code, for U.S. military use, transmits at 10.23 million
chips per second. The L1 carrier is modulated by both the C/A and P codes,
while the L2 carrier is only modulated by the P code. The P code can be
encrypted as a so-called P(Y) code which is only available to military

GPS TRACKING SYSTEM

equipment with a proper decryption key. Both the C/A and P(Y) codes impart
the precise time-of-day to the user.
Table 1.7.1: GPS Frequency Overview

Each composite signal (in-phase and quadrature phase) becomes:

where
data

and

represent signal powers;

and

represent codes with/without

.

(1.8) GPS CALCULATIONS:
At a particular time (let's say midnight), the satellite begins transmitting a long,
digital pattern called a pseudo-random code. The receiver begins running the same
digital pattern also exactly at midnight. When the satellite's signal reaches the
receiver, its transmission of the pattern will lag a bit behind the receiver's playing of
the pattern.The length of the delay is equal to the signal's travel time. The receiver

GPS TRACKING SYSTEM

multiplies this time by the speed of light to determine how far the signal traveled.
Assuming the signal traveled in a straight line, this is the distance from receiver to
satellite.

Figure 1.8.1: (A GPS satellite,Photo courtesy U.S. Army)
In order to make this measurement, the receiver and satellite both need clocks that
can be synchronized down to the nanosecond. To make a satellite positioning system
using only synchronized clocks, you would need to have atomic clocks not only on
all the satellites, but also in the receiver itself. But atomic clocks cost somewhere
between $50,000 and $100,000, which makes them a just a bit too expensive for
everyday consumer use.
The Global Positioning System has a clever, effective solution to this problem. Every
satellite contains an expensive atomic clock, but the receiver itself uses an ordinary
quartz clock, which it constantly resets. In a nutshell, the receiver looks at incoming
signals from four or more satellites and gauges its own inaccuracy. In other words,
there is only one value for the "current time" that the receiver can use. The correct
time value will cause all of the signals that the receiver is receiving to align at a
single point in space. That time value is the time value held by the atomic clocks in
all of the satellites. So the receiver sets its clock to that time value, and it then has the

GPS TRACKING SYSTEM

same time value that all the atomic clocks in all of the satellites have. The GPS
receiver gets atomic clock accuracy "for free."
When you measure the distance to four located satellites, you can draw four spheres
that all intersect at one point. Three spheres will intersect even if your numbers are
way off, but four spheres will not intersect at one point if you've measured
incorrectly. Since the receiver makes all its distance measurements using its own
built-in clock, the distances will all be proportionally incorrect.
The receiver can easily calculate the necessary adjustment that will cause the four
spheres to intersect at one point. Based on this, it resets its clock to be in sync with
the satellite's atomic clock. The receiver does this constantly whenever it's on, which
means it is nearly as accurate as the expensive atomic clocks in the satellites.
In order for the distance information to be of any use, the receiver also has to know
where the satellites actually are. This isn't particularly difficult because the satellites
travel in very high and predictable orbits. The GPS receiver simply stores an
almanac that tells it where every satellite should be at any given time. Things like
the pull of the moon and the sun do change the satellites' orbits very slightly, but the
Department of Defense constantly monitors their exact positions and transmits any
adjustments to all GPS receivers as part of the satellites' signals.

(1.9)GPS ACCURACY:
–

The accuracy of a position determined with GPS depends on the type of
receiver. Most hand-held GPS units have about 10-20 meter accuracy.

–

Other types of receivers use a method called Differential GPS (DGPS) to
obtain much higher accuracy.

–

DGPS requires an additional receiver fixed at a known location nearby.

–

Observations made by the stationary receiver are used to correct positions
recorded by the roving units, producing an accuracy greater than 1 meter.

GPS TRACKING SYSTEM

–

When the system was created, timing errors were inserted into GPS
transmissions to limit the accuracy of non-military GPS receivers to about
100 meters.

–

This part of GPS operations, called Selective Availability, was eliminated in
May 2000.

(1.10) OBJECTIVE:
To locate the position of the any object or person attached with GPS receiver.

(2) LITERATURE REVIEW
(2.1) THEORY:
The GPS system belongs to the Department of Defense (DOD) and is officially
known as the NAVSTAR System (Navigation Satellite Timing and Ranging). Its
primary mission is to provide the U.S. Government and the Department of Defense

GPS TRACKING SYSTEM

the ability to accurately determine one’s position at any point on the earth’s surface,
at any time of the day or night, and in any weather condition. Sounds simple, but it
took a number of years and a commitment of over 12 billion dollars before the first
GPS satellite was deployed.
As originally envisioned, a minimum constellation of 24 satellites would be required
to meet the objectives of the GPS program. More than 24 would provide redundancy
and additional accuracy. Satellites would have a design life of 10 to 13 years, and
would be replaced as needed. The full complement of 24 operational satellites was
finally realized in 1994, more than 20 years after the system was originally proposed.
(Constellation of 24 GPS satellites)
Figure 2.1.1
Although GPS was originally envisioned for military use, it soon became obvious
that there would be numerous civilian applications as well. The first two major
civilian applications were marine navigation and surveying. Since then, a myriad of
applications have emerged, from personal positioning for scientific, commercial, and
recreational uses, to truck fleet management, map-based navigation aids for
automobiles and hand held computers, landing aids for aircraft, control of
construction and agricultural machinery and, in the near future, reporting of exact
cell-phone locations for emergency response purposes. As with many technologies,
the uses of GPS extend far beyond what the original designers envisioned. As
receivers have shrunk in size and weight and costs continue to drop, the number of
users and applications has grown rapidly.

(2.2) Components of the GPS System:
There are 3 main components to the GPS system. These components are known as
Segments, as follows:
 Space Segment - the satellites, also known as space vehicles or SVs
 Control Segment - ground stations run by the DOD
 User Segment - all users and their GPS receivers

GPS TRACKING SYSTEM

These three segments are illustrated schematically below.

Figure 2.2.1

Space Segment: Twenty four separate individual satellites situated in their own
orbit above 11,000 nautical miles from the earth consists space segment.

Control Segment: Control segment component is the control station which
works to check out the functions of satellite, whether these are properly working
or not. There are only five control stations situated in the entire world.

User Segment: This component is made for the user. User can hold it in its
hand or it can be mounted in the car. It works as a receiver.

GPS TRACKING SYSTEM

Figure 2.2.2

(3) PROPOSED METHODOLOGY
(3.1) COMPLETE BLOCK DIAGRAM:

GPS TRACKING SYSTEM

ON BOARD BLOCK DIAGRAM:

GPS
Tx

ATMEGA 8
MICROCONTROLLER

GPS
MODULE

POWER
SUPPLY

LCD

Figure 3.1.1

OFF BOARD BLOCK DIAGRAM:

GPS
Rx

ATMEGA 8
MICROCONTROLLER

POWER
SUPPLY

LCD

Figure 3.1.2

(3.2) DESCRIPTION:
GPS Tracking System works on the principle of satellite communication. In On
board block diagram, there is GPS module. Intially, it takes the signal from the
satellite then it sends the command to ATMEGA 8 microcontroller. Then this
microcontroller, sends a signal to GPS transmitter that signal will also be displayed
on LCD screen, connected in on board diagram.

GPS TRACKING SYSTEM

Transmitted signal by GPS transmitter will be received by GPS receiver connected in
Off board block diagram. Then ATMEGA 8 microcontroller, sends the signal to
LCD, which will display the position of the receiver.
Two LCD’s are used in our project for matching purpose, accuracy if the position of
receiver is changed, then the new position can also be find.

GPS TRACKING SYSTEM

(4) SOFTWARE/HARDWARE
REQUIREMENTS AND SPECIFICATIONS
Table 4.1: Components Used
S.NO
(1)
(2)

SPECIFICATIONS

RATINGS

GPS MODULE

5V

AT MEGA 8
MICROCONTROLLER

QUANTITY
1

5V

2

(3)

CAPACITORS

10 µF

6

(4)

RESISTANCES

4.7 KΩ

18

(5)

LCD {16X2}

2

(6)

GPS TRANSMITTER

433 MHz

1

(7)

GPS RECEIVER

433 MHz

1

(4.1)
OF EACH
(8) DESCRIPTIONS
IC 7805
5-18 COMPONENT:
V
I.

(9)

ATMEGA 8 MICROCONTROLLER :
LED

2
3

a) FEATURES:


High-performance, Low-power Atmel®AVR® 8-bit Microcontroller



Advanced RISC Architecture

 130 Powerful Instructions – Most Single-clock Cycle Execution
 32 × 8 General Purpose Working Fully Static Operation
 Up to 16 MIPS Throughput at 16MHz
 On-chip 2-cycle Multiplier

GPS TRACKING SYSTEM



High Endurance Non-volatile Memory segments

 8Kbytes of In-System Self-programmable Flash program memory
 512Bytes EEPROM
 1Kbyte Internal SRAM
 Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
 Data retention: 20 years at 85°C/100 years at 25°C
 Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
 Programming Lock for Software Security


Peripheral Features

 Two 8-bit Timer/Counters with Separate Prescaler, one Compare Mode
 One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and
Capture mode
 Real Time Counter with Separate Oscillator
 Three PWM Channels
 8-channel ADC in TQFP and QFN/MLF package
Eight Channels 10-bit Accuracy
 6-channel ADC in PDIP package
Six Channels 10-bit Accuracy
 Byte-oriented Two-wire Serial Interface
 Programmable Serial USART
 Master/Slave SPI Serial Interface

GPS TRACKING SYSTEM

 Programmable Watchdog Timer with Separate On-chip Oscillator
 On-chip Analog Comparator


Special Microcontroller Features

 Power-on Reset and Programmable Brown-out Detection
 Internal Calibrated RC Oscillator
 External and Internal Interrupt Sources
 Five Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down,
and
 Standby


I/O and Packages

 23 Programmable I/O Lines
 28-lead PDIP, 32-lead TQFP, and 32-pad QFN/MLF


Operating Voltages

 4.5V - 5.5V (ATmega8)


Speed Grades

 0 - 16MHz (ATmega8)


Power Consumption at 4Mhz, 3V, 25°C

 Active: 3.6mA
 Idle Mode: 1.0mA
 Power-down Mode: 0.5Μa

GPS TRACKING SYSTEM

b)PIN DESCRIPTIONS:



VCC: Digital supply voltage.



GND: Ground.



Port B (PB7-PB0) XTAL1/XTAL2/TOSC1/TOSC2:

–

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors
(selected for each bit). The Port B output buffers have symmetrical drive
characteristics with both high sink and source capability. As inputs, Port B
pins that are externally pulled low will source current if the pull-up resistors
are activated. The Port B pins are tri-stated when a reset condition becomes
active, even if the clock is not running.

GPS TRACKING SYSTEM

–

Depending on the clock selection fuse settings, PB6 can be used as input to
the inverting Oscillator amplifier and input to the internal clock operating
circuit.

–

Depending on the clock selection fuse settings, PB7 can be used as output
from the inverting Oscillator amplifier.

–

If the Internal Calibrated RC Oscillator is used as chip clock source, PB7..6 is
used as TOSC2.1 input for the Asynchronous Timer/Counter2 if the AS2 bit
in ASSR is set.



Port C (PC5-PC0):

–

Port C is a 7-bit bi-directional I/O port with internal pull-up resistors
(selected for each bit). The Port C output buffers have symmetrical drive
characteristics with both high sink and source capability.

–

As inputs, Port C pins that are externally pulled low will source current if the
pull-up resistors are activated. The Port C pins are tri-stated when a reset
condition becomes active, even if the clock is not running.



PC6/RESET:

–

If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that
the electrical characteristics of PC6 differ from those of the other pins of Port
C.

–

If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low
level on this pin for longer than the minimum pulse length will generate a
Reset, even if the clock is not running.



Port D (PD7-PD0):

–

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors
(selected for each bit). The Port D output buffers have symmetrical drive
characteristics with both high sink and source capability.

–

As inputs, Port D pins that are externally pulled low will source current if the
pull-up resistors are activated. The Port D pins are tri-stated when a reset
condition becomes active, even if the clock is not running.

GPS TRACKING SYSTEM



RESET:

–

Reset input. A low level on this pin for longer than the minimum pulse length
will generate a reset, even if the clock is not running.

II. CAPACITOR:
–

A capacitor (originally known as condenser) is a passive two-terminal
electrical component used to store energy in an electric field. The forms of
practical capacitors vary widely, but all contain at least two electrical
conductors separated by a dielectric (insulator)

–

For example, one common construction consists of metal foils separated by a
thin layer of insulating film. Capacitors are widely used as parts of electrical
circuits in many common electrical devices.

III. RESISTANCE:
–

The electrical resistance of an electrical element is the opposition to the
passage of an electric current through that element; the inverse quantity is
electrical conductance, the ease at which an electric current passes.

–

Electrical resistance shares some conceptual parallels with the mechanical
notion of friction.

–

The SI unit of electrical resistance is the ohm (Ω), while electrical
conductance is measured in siemens (S).

GPS TRACKING SYSTEM

–

An object of uniform cross section has a resistance proportional to its
resistivity and length and inversely proportional to its cross-sectional area.
All materials show some resistance, except for superconductors, which have a
resistance of zero.

IV.
–

LCD (LIQUID CRYSTAL DISPLAY):
LCD (Liquid Crystal Display) screen is an electronic display module and find
a wide range of applications. A 16x2 LCD display is very basic module and is
very commonly used in various devices and circuits. These modules are
preferred over seven segments and other multi segment LEDs.

–

A 16x2 LCD means it can display 16 characters per line and there are 2 such
lines. In this LCD each character is displayed in 5x7 pixel matrix. This LCD
has two registers, namely, Command and Data.

–

The command register stores the command instructions given to the LCD. A
command is an instruction given to LCD to do a predefined task like
initializing it, clearing its screen, setting the cursor position, controlling

GPS TRACKING SYSTEM

display etc. The data register stores the data to be displayed on the LCD. The
data is the ASCII value of the character to be displayed on the LCD.

a) PIN DESCRIPTION:
Pin
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

Function

Name

Ground (0V)
Ground
Supply voltage; 5V (4.7V – 5.3V)
Vcc
Contrast adjustment; through a variable resistor
VEE
Selects command register when low; and data register when Register Select
high
Low to write to the register; High to read from the register
Sends data to data pins when a high to low pulse is given

b) PIN DIAGRAM:

8-bit data pins

Backlight VCC (5V)
Backlight Ground (0V)

Read/write
Enable
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
Led+
Led-

GPS TRACKING SYSTEM

V.

VOLTAGE REGULATOR(IC 7805):
–

7805 is a voltage regulator integrated circuit. It is a member of 78xx series of
fixed linear voltage regulator ICs. The voltage source in a circuit may have
fluctuations and would not give the fixed voltage output. The voltage
regulator IC maintains the output voltage at a constant value.

–

The xx in 78xx indicates the fixed output voltage it is designed to provide.
7805 provides +5V regulated power supply. Capacitors of suitable values can
be connected at input and output pins depending upon the respective voltage
levels.

a) PIN DIAGRAM:

GPS TRACKING SYSTEM

Pin
No.

Function

Name

1
2
3

Input voltage (5V-18V)
Ground (0V)
Regulated output; 5V (4.8V-5.2V)

Input
Ground
Output

VI.

LIGHT EMITTING DIODE:
–

A light-emitting diode (LED) is a semiconductor light source. LEDs are
used as indicator lamps in many devices and are increasingly used for other
lighting. Introduced as a practical electronic component in 1962, early LEDs
emitted low-intensity red light, but modern versions are available across the
visible, ultraviolet and infrared wavelengths, with very high brightness.

–

When a light-emitting diode is forward biased (switched on), electrons are
able to recombine with electron holes within the device, releasing energy in
the form of photons. This effect is called electroluminescence and the color of
the light (corresponding to the energy of the photon) is determined by the
energy gap of the semiconductor.

GPS TRACKING SYSTEM

–

LEDs are often small in area (less than 1 mm2), and integrated optical
components may be used to shape its radiation pattern.

–

LEDs present many advantages over incandescent light sources including
lower energy consumption, longer lifetime, improved robustness, smaller
size, faster switching, and greater durability and reliability.

–

LEDs powerful enough for room lighting are relatively expensive and require
more precise current and heat management than compact fluorescent lamp
sources of comparable output.

VII.

GPS RECEIVER:
In any satellite receiver since the input power is of the order of picowatts and the
C/N to be maintained to get demodulated S/N above the threshold fixed for free
processing.

LOW NOISE
BLOCK
CONVERTE
R

DIGITAL
BASEBAN
D
PROCESS
OR

CPU

GPS TRACKING SYSTEM

I/O

LOCAL
OSCILLATO
R

EXTERNAL
MEMORY

Figure 4.2: (GPS Receiver block diagram)
–

This block diagram shows the configuration of GPS receiver. To recover the
baseband cost’s loop is used with phase synchronization of local oscillator or
else the signal cannot be detected.

–

The required PN code is locally generated to detect the chip of the spread
spectrum received signal. This requires as many correlators as the visible
satellites. Most of the receivers have 12 correlators. Diversity reception is
used and the strongest signals are used for processing. The CPU uses
software to calculate XY and Z coordinates and hence find latitude, longitude
and altitude.

GPS TRACKING SYSTEM

(5) IMPLEMENTATION
(5.1) COMPLETE CIRCUIT DIAGRAM :
 ON BOARD CIRCUIT DIAGRAM:

GPS TRACKING SYSTEM

Figure 5.1.1

 OFF BOARD CIRCUIT DIAGRAM:

GPS TRACKING SYSTEM

Figure 5.1.2

(5.2)WORKING:
–

Since ATMEGA 8 microcontroller needs 5V regulated supply hence we use a IC
7805 voltage regulator which converts 12V unregulated supply into 5V regulated
supply. LED‘s are used for indicate on purposes.

–

Intially, in On board diagram antenna connected to the GPS module receiver
takes signal from the satellite’s and then GPS module sends a command signal to
the microcontroller.

–

The GPS transmitter connected to the microcontroller senses these signal and
then transmits a signal which is received by the antenna of GPS receiver
connected in the Off board diagram then the GPS receiver sends a signal to
microcontroller sends these signal to the LCD for display purpose and then we

GPS TRACKING SYSTEM

can see the exact location/position of receiver/object on the LCD in the terms of
altitude, latitude, longitude and time.

(5.3)PCB LAYOUT OF CIRCUIT DIAGRAM:
 GPS TRANSMITTER:

Figure 5.3.1

GPS TRACKING SYSTEM

 GPS RECEIVER:

Figure 5.3.2

GPS TRACKING SYSTEM

(5.4) PICTURE OF HARDWARE LAYOUT:
 ON BOARD:

Figure 5.4.1

 OFF BOARD:

Figure 5.4.2

GPS TRACKING SYSTEM

(5.5) Program to get latitude and longitude value from GPS
modem and display it on LCD:
/*
LCD DATA port----PORT A
signal port------PORT B
rs-------PB0
rw-------PB1
en-------PB2
*/
#define F_CPU 12000000UL
#include<avr/io.h>
#include<util/delay.h>
#define USART_BAUDRATE 4800
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
#define LCD_DATA PORTA
#define ctrl PORTB
#define en PB2
#define rw PB1
#define rs PB0
void LCD_cmd(unsigned char cmd);
void init_LCD(void);
void LCD_write(unsigned char data);
void LCD_write_string(unsigned char *str);
void usart_init();
unsigned int usart_getch();
unsigned char value,i,lati_value[15],lati_dir, longi_value[15], longi_dir, alti[5] ;
int main(void)
{
DDRA=0xff;
DDRB=0x07;

GPS TRACKING SYSTEM

init_LCD()
_delay_ms(50);
LCD_write_string("we at");
LCD_cmd(0xC0);
usart_init();
while(1)
{
value=usart_getch();
if(value=='$')
{
value=usart_getch();
if(value=='G')
{
value=usart_getch();
if(value=='P')
{
value=usart_getch();
if(value=='G')
{
value=usart_getch();
if(value=='G')
{
value=usart_getch();
if(value=='A')
{
value=usart_getch();
if(value==',')
{
value=usart_getch();
while(value!=',')
{

GPS TRACKING SYSTEM

value=usart_getch();
}
lati_value[0]=usart_getch();
value=lati_value[0];
for(i=1;value!=',';i++)
{
lati_value[i]=usart_getch();
value=lati_value[i];
}
lati_dir=usart_getch();
value=usart_getch();
while(value!=',')
{
value=usart_getch();
}
longi_value[0]=usart_getch();
value=longi_value[0];
for(i=1;value!=',';i++)
{
longi_value[i]=usart_getch();
value=longi_value[i];
}
longi_dir=usart_getch();
LCD_cmd(0x01);
_delay_ms(1);
LCD_cmd(0x80);
_delay_ms(1000);
i=0;
while(lati_value[i]!='\0')
{
LCD_write(lati_value[j]);

GPS TRACKING SYSTEM

j++;
}
LCD_write(lati_dir);
LCD_cmd(0xC0);
_delay_ms(1000);
i=0;
while(longi_value[i]!='\0')
{
LCD_write(longi_value[i]);
i++;
}
LCD_write(longi_dir);
_delay_ms(1000)
}
}
}
}
}
}
}
}
}
void init_LCD(void)
{
LCD_cmd(0x38);
_delay_ms(1);
LCD_cmd(0x01)
_delay_ms(1);
LCD_cmd(0x0E);
_delay_ms(1)

GPS TRACKING SYSTEM

LCD_cmd(0x80);
_delay_ms(1);
return;
}
void LCD_cmd(unsigned char cmd)
{
LCD_DATA=cmd;
ctrl =(0<<rs)|(0<<rw)|(1<<en);
_delay_us(40);
ctrl =(0<<rs)|(0<<rw)|(0<<en);
//_delay_ms(50);
return;
}
void LCD_write(unsigned char data)
{
LCD_DATA= data;
ctrl = (1<<rs)|(0<<rw)|(1<<en);
_delay_us(40);
ctrl = (1<<rs)|(0<<rw)|(0<<en);
//_delay_ms(50);
return ;
}
void usart_init()
{
UCSRB |= (1<<RXCIE) | (1 << RXEN) | (1 << TXEN);
UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);
UBRRL = BAUD_PRESCALE;
UBRRH = (BAUD_PRESCALE >> 8);
unsigned int usart_getch()
{

GPS TRACKING SYSTEM

while ((UCSRA & (1 << RXC)) == 0);
return(UDR);
}
void LCD_write_string(unsigned char *str)
{
int i=0;
while(str[i]!='\0')
{
LCD_write(str[i]);
i++;
}
return;
}
ConFigure Lcd = 16 * 2
ConFigure Lcdpin = Pin , Rs = Portb.7 , E = Portb.6 , Db4 = Portb.5 , Db5 =
Portb.4 , Db6 = Portb.3 , Db7 = Portb.2
ConFigure Portb = Output
ConFigure Keyboard = Pind.6 , Data = Pinb.0 , Keydata = Keydata
'$GPGGA,012211.83,4119.6171,N,07730.0636,W,1,03,3.6,00522,M,,,,*36
Dim Gps As Byte , X As Byte , Lont(12) As Byte
Dim Flag As Bit
Dim Place(16) As Byte
Dim Temp As Byte
Dim Mydata(12) As Byte
Dim Myplace(16) As Byte
Dim Eepromdata(12) As Eram Byte At &H01
Dim Eepromplace(16) As Eram Byte At &H10
'Buzzer Alias Pinb.1
Mark Alias Pind.2
ConFigure Mark = Input
'Set Pinb.1

GPS TRACKING SYSTEM

Portb = &B0000000
For X = 1 To 12
Mydata(x) = Eepromdata(x)
Next
For X = 1 To 16
Myplace(x) = Eepromplace(x)
Next
Flag = 0
Looploops:
Cls
Cursor Off
Looploop:
Home
Upperline
Startloop:
If Mark = 0 Then Goto Mark_place
Gps = Waitkey()
If Gps <> "$" Then Goto Startloop
Gps = Waitkey()
If Gps <> "G" Then Goto Startloop
Gps = Waitkey()
If Gps <> "P" Then Goto Startloop
Gps = Waitkey()
If Gps <> "G" Then Goto Startloop
Gps = Waitkey()
If Gps <> "G" Then Goto Startloop
Gps = Waitkey()
If Gps <> "A" Then Goto Startloop
Gps = Waitkey()
If Gps <> "," Then Goto Startloop
For X = 1 To 6

GPS TRACKING SYSTEM

Gps = Waitkey()
Next X
Timlop:
Gps = Waitkey()
If Gps = "," Then Goto Getlat
Goto Timlop
Getlat:
For X = 1 To 6
Getlat1:
Gps = Waitkey()
If Gps = "." Then Goto Getlat1
Lont(x) = Gps
Lcd Chr(gps);
If X = 2 Then Lcd ".";
If X = 4 Then Lcd ".";
Next X
Getlat2:
Gps = Waitkey()
If Gps <> "," Then Goto Getlat2
Gps = Waitkey()
Lcd Chr(gps) ; " ";
Gps = Waitkey()
Gps = Waitkey()
Lowerline
For X = 7 To 12
Getlon:
Gps = Waitkey()
If Gps = "." Then Goto Getlon
Lont(x) = Gps
Lcd Chr(gps);
If X = 8 Then Lcd ".";

GPS TRACKING SYSTEM

If X = 10 Then Lcd ".";
Next X
Getlon1:
Gps = Waitkey()
If Gps <> "," Then Goto Getlon1
Gps = Waitkey()
Lcd Chr(gps);
If Mydata(3) = Lont(3) Then
If Mydata(4) = Lont(4) Then
If Mydata(5) = Lont(5) Then
If Mydata(6) = Lont(6) Then
If Flag = 0 Then
Cls
Portb = &B0000010
For X = 1 To 16
Lcd Chr(myplace(x))
Next
Wait 10
Cls
Flag = 1
Portb = &B0000000
End If
Else
Flag = 0
End If
End If
End If
End If
Goto Looploop
End
Mark_place:

GPS TRACKING SYSTEM

Cls
Lcd " Enter the Name"
Lowerline
Cursor On Blink
For X = 1 To 16
Place(x) = &H20
Next
X=1
Mark_places:
Gps = Getatkbd()
If Gps = 125 Then Goto Looploops
If Gps = 13 Then
If X = 0 Then
Goto Mark_place
Else
For X = 1 To 12
Eepromdata(x) = Lont(x)
Mydata(x) = Lont(x)
Next
For X = 1 To 16
Eepromplace(x) = Place(x)
Myplace(x) = Place(x)
Next
Cls
Lcd "Place Marked"
Flag = 1
Wait 2
Goto Looploops
End If
Elseif Gps > 0 Then
If X <> 17 Then

GPS TRACKING SYSTEM

Lcd Chr(gps)
Place(x) = Gps
X=X+1
End If
End If
Goto Mark_places
Keydata:
'normal keys lower case
Data 0 , 0 , 0 , 0 , 0 , 200 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , &H5E , 0
Data 0 , 0 , 0 , 0 , 0 , 113 , 49 , 0 , 0 , 0 , 122 , 115 , 97 , 119 , 50 , 0
Data 0 , 99 , 120 , 100 , 101 , 52 , 51 , 0 , 0 , 32 , 118 , 102 , 116 , 114 , 53 , 0
Data 0 , 110 , 98 , 104 , 103 , 121 , 54 , 7 , 8 , 44 , 109 , 106 , 117 , 55 , 56 , 0
Data 0 , 44 , 107 , 105 , 111 , 48 , 57 , 0 , 0 , 46 , 45 , 108 , 48 , 112 , 43 , 0
Data 0 , 0 , 0 , 0 , 0 , 92 , 0 , 0 , 0 , 0 , 13 , 0 , 0 , 92 , 0 , 0
Data 0 , 60 , 0 , 0 , 0 , 0 , 8 , 0 , 0 , 49 , 0 , 52 , 55 , 0 , 0 , 0
Data 48 , 44 , 50 , 53 , 54 , 56 , 125 , 0 , 0 , 43 , 51 , 45 , 42 , 57 , 0 , 0
'shifted keys UPPER case
Data 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
Data 0 , 0 , 0 , 0 , 0 , 81 , 33 , 0 , 0 , 0 , 90 , 83 , 65 , 87 , 34 , 0
Data 0 , 67 , 88 , 68 , 69 , 0 , 35 , 0 , 0 , 32 , 86 , 70 , 84 , 82 , 37 , 0
Data 0 , 78 , 66 , 72 , 71 , 89 , 38 , 0 , 0 , 76 , 77 , 74 , 85 , 47 , 40 , 0
Data 0 , 59 , 75 , 73 , 79 , 61 , 41 , 0 , 0 , 58 , 95 , 76 , 48 , 80 , 63 , 0
Data 0 , 0 , 0 , 0 , 0 , 96 , 0 , 0 , 0 , 0 , 13 , 94 , 0 , 42 , 0 , 0
Data 0 , 62 , 0 , 0 , 0 , 8 , 0 , 0 , 49 , 0 , 52 , 55 , 0 , 0 , 0 , 0
Data 48 , 44 , 50 , 53 , 54 , 56 , 0 , 0 , 0 , 43 , 51 , 45 , 42 , 57 , 0 , 0

HEX CODE GENERATED
:100000000AC018951895189518951895189518956B
:100010001895189518958FED8DBFC0ECE8EB4E2E16
:10002000DD275D2EEEE7F0E0A0E6B0E088278D93B7

GPS TRACKING SYSTEM

:100030003197E9F78FE289B988E18AB9EAD2662473
:100040008FEF87BBB8988E988A9880E088BB81E054
:1000500080936100009161000C3010F009F011C034
:10006000E1E6F0E0A190E0E0F0E0EA0DA1E6AD907D
:10007000AFE7AA0DA9D3A1E68C918F5F8C9308F40A
:10008000E9CF81E08093610000916100003110F0C0
:1000900009F011C0E1E6F0E0A190EFE0F0E0EA0D38
:1000A000A1E6AD90ABE8AA0D8FD3A1E68C918F5F4E
:1000B0008C9308F4E9CF80916E008F7780936E0067
:1000C00097D28CE0EED28ED298D20027A0E38C910A
:1000D00082FB0EF401E040E0041709F001C051C1B9
:1000E00077D2A0E68C9384E2482F00916000041739
:1000F00009F401C0EACF6CD2A0E68C9387E4482FC4
:1001000000916000041709F401C0DFCF61D2A0E6BE
:100110008C9380E5482F00916000041709F401C01A
:10012000D4CF56D2A0E68C9387E4482F009160008C
:10013000041709F401C0C9CF4BD2A0E68C9387E421
:10014000482F00916000041709F401C0BECF40D2CF
:10015000A0E68C9381E4482F00916000041709F415
:1001600001C0B3CF35D2A0E68C938CE2482F00912A
:100170006000041709F401C0A8CF81E080936100FA
:1001800000916100063010F009F009C021D2A0E60C
:100190008C93A1E68C918F5F8C9308F4F1CF18D2E9
:1001A000A0E68C938CE2482F00916000041709F0C0
:1001B00001C001C0F4CF81E0809361000091610033
:1001C000063010F009F02BC003D2A0E68C938EE22B
:1001D000482F00916000041709F001C0F5CF80910D
:1001E0006000A1E6AD90A1E6AA0D8C93A0E68C91EB
:1001F00052D200916100023009F003C0ECEDF7E04B
:10020000EBD100916100043009F003C0ECEDF7E0A0
:10021000E3D1A1E68C918F5F8C9308F4CFCFD8D136

GPS TRACKING SYSTEM

:10022000A0E68C938CE2482F00916000041709F43B
:1002300001C0F5CFCDD1A0E68C93A0E68C912BD256
:10024000EEEDF7E0C9D1C4D1A0E68C93C1D1A0E610
:100250008C93CCD187E080936100009161000C30D9
:1002600010F009F02BC0B4D1A0E68C938EE2482F99
:1002700000916000041709F001C0F5CF8091600083
:10028000A1E6AD90A1E6AA0D8C93A0E68C9103D2D5
:1002900000916100083009F003C0ECEDF7E09CD15B
:1002A000009161000A3009F003C0ECEDF7E094D151
:1002B000A1E68C918F5F8C9308F4CFCF89D1A0E613
:1002C0008C938CE2482F00916000041709F401C060
:1002D000F5CF7ED1A0E68C93A0E68C91DCD1409145
:1002E000640000918200041709F048C04091650045
:1002F00000918300041709F041C04091660000910D
:100300008400041709F03AC040916700009185000D
:10031000041709F02EC00027AEE68C9187FB0EF47F
:1003200001E040E0041709F023C062D182E088BBFD
:1003300081E08093610000916100003110F009F0CC
:100340000CC0A1E6AD90ABE8AA0D8C91A4D1A1E6BA
:100350008C918F5F8C9308F4EECFEAE0F0E050D1FF
:1003600047D180916E00806880936E0080E088BBEA
:1003700005C080916E008F7780936E00A4CEF894B4
:10038000FFCF36D1E0EEF7E027D130D18FE089D131
:1003900081E08093610000916100003110F009F06C
:1003A0000CC080E2A1E6AD90AEE6AA0D8C93A1E66A
:1003B0008C918F5F8C9308F4EECF81E08093610085
:1003C000AED1A0E68C93009160000D3709F001C01A
:1003D00077CE009160000D3009F05FC000916100A0
:1003E000003009F002C0CDCF57C081E0809361009A
:1003F000009161000C3010F009F01CC0E1E6F0E063
:10040000A190E0E0F0E0EA0DA1E6AD90A1E6AA0D32

GPS TRACKING SYSTEM

:100410007BE7C9D1A1E6AD90A1E6AA0D8C91A1E63A
:10042000AD90AFE7AA0D8C93A1E68C918F5F8C9372
:1004300008F4DECF81E0809361000091610000311B
:1004400010F009F01CC0E1E6F0E0A190EFE0F0E070
:10045000EA0DA1E6AD90AEE6AA0D7BE7A4D1A1E638
:10046000AD90AEE6AA0D8C91A1E6AD90ABE8AA0DD9
:100470008C93A1E68C918F5F8C9308F4DECFB8D07B
:10048000E0EFF7E0A9D080916E00806880936E0065
:10049000E2E0F0E0B5D014CE1AC000916000003068
:1004A00010F009F001C013C000916100013109F49E
:1004B0000EC0A0E68C91EFD080916000A1E6AD90D7
:1004C000AEE6AA0D8C93A1E68C918F5F8C9378CFCA
:1004D0000000000000C800000000000000005E00F6
:1004E000000000000071310000007A736177320073
:1004F00000637864653433000020766674723500DA
:10050000006E626867793607082C6D6A75373800A7
:10051000002C6B696F303900002E2D6C30702B0071
:1005200000000000005C000000000D00005C000006
:10053000003C0000000008000031003437000000DB
:10054000302C323536387D00002B332D2A3900000F
:10055000000000000000000000000000000000009B
:10056000000000000051210000005A5341572200B2
:1005700000435844450023000020564654522500AD
:10058000004E424847592600004C4D4A552F28003E
:10059000003B4B494F3D2900003A5F4C30503F0033
:1005A000000000000060000000000D5E002A000056
:1005B000003E000000080000310034370000000059
:1005C000302C323536380000002B332D2A3900000C
:1005D0005F9BFECF8CB10895DDD0802D11F05BD0F4
:1005E000FBCF089582E05DD011D007C080EC59C0E8
:1005F00081E057D00BD080E854C080E852D00895F5

GPS TRACKING SYSTEM

:1006000088EE93E07AD03197D9F7089583E099275F
:1006100074C08AEF90E071D0BA9ABB9ABC9ABD9A26
:10062000BE9ABF9AC79885E090E067D0C698C298F6
:10063000C398C49AC59AC69AEF93FF93E8E5F0E091
:1006400050D0FF91EF91C69855D0C69AEF93FF9383
:10065000E8E5F0E046D0FF91EF91C6984BD0C69AFE
:10066000EF93FF93E8E5F0E03CD0FF91EF91C6985F
:1006700041D0C598C69AEF93FF93E8E5F0E031D0FA
:10068000FF91EF91C69836D088E20BD08EE009D06A
:1006900086E007D00895C79A829505D004D02AD065
:1006A0000895C798F9CF859510F4C59A01C0C598EB
:1006B000859510F4C49A01C0C498859510F4C39A26
:1006C00001C0C398859510F4C29A01C0C298C69A19
:1006D000EF93FF93E8E5F0E004D0FF91EF91C69827
:1006E00008953197F1F70895689462F80895E894B1
:1006F00062F8089581E090E000C0EF93FF93EE2749
:10070000E82BE92B31F0EAE9F3E03197F1F70197B3
:10071000D1F7FF91EF91089562FA26F432C0E89480
:1007200062F80BE08699F8CF023038F031F00B30E8
:1007300008F003C09695B0999068869BFECF0A9505
:1007400089F7153619F4892F11270895903F19F468
:10075000689465F816C0923111F0993529F465FA5C
:10076000AEF0689464F80DC065FA6EF064FA0EF4A9
:100770009058E0EDF4E08827E90FF81FC895802D28
:10078000089588270895E89465F8FBCFE89464F805
:1007900065F8F7CFC895319600200895E199FECF0E
:1007A000EEBB3196089591E001C092E07B3751F4A1
:1007B0007FB7F894F3DF8D918DBBE29AE19A9A9519
:1007C000C9F77FBF7727089591E001C092E0E6DF87
:1007D000E09A8DB38D939A95D1F708952E0020005D
:1007E00020456E74657220746865204E616D6500E9

GPS TRACKING SYSTEM

:0E07F000506C616365204D61726B65640000A2
:00000001FF

(6) TESTING ( TEST DATA)
 First of all check the continuity and short circuit of the PCB's.

GPS TRACKING SYSTEM

 Before placing the IC test the power supply first.
 Place the power supply in the connector.
 Make the black terminal of the MM common on the ground of the supply
source and turn the knob to DC voltage range.
TESTING POINTS

OUTPUT

PIN-40 of Controller
PIN 3 of 7805

+5V
+5V

(6.1)Testing semiconductors with multimeters:
Before building any circuit is it a good idea to test every semiconductor you plan
to use in the project. This a good practice especially when reusing components
from old appliances. This short tutorial describes common procedures for testing
of Si and Ge signal and rectifier diodes, zener diodes, LEDs for common failures
like shorts, leaks and opens.

(6.2) Testing signal and rectifier diode junctions:
A regular signal or rectifier diode should read a low resistance on an analog
ohmmeter (set on the low ohms scale) when forward biased (negative lead on
cathode, positive lead on anode) and nearly infinite ohms in the reverse bias
direction. A germanium diode will show a lower resistance compared to a silicon
diode in the forward direction. A bad diode will show near zero ohms (shorted)
or open in both directions.
– Note: often, analog multimeters have the polarity of their probes reversed
from what you would expect from the color coding. Many of them will
–

have the red lead negative with respect to the black one.
On a digital multimeter, using the normal resistance ranges, this test will
usually show open for any semiconductor junction since the meter does

–

not apply enough voltage to reach the value of the forward drop.
Fortunately almost every digital multimeter will have a diode test mode.
Using this mode, a silicon diode should read a voltage drop between 0.5 to
0.8 V in the forward direction (negative lead on cathode, positive lead on
anode) and open in reverse. For a germanium diode, the reading will be

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lower, around 0.2 - 0.4 V in the forward direction. A bad diode will read a
–

very low voltage drop (if shorted) or open in both directions.
Note: small diode leaks in the reverse bias direction are rare, but they will
often go unnoticed when using the diode test mode on the majority of
digital multimeters. To make sure the diode is good, you should make one
more measurement: using a high ohm range (2Mohm or higher) on your
DMM, place the negative lead on the anode and the positive lead on the
cathode. A good Si diode (the most common type of diode in today's
circuits) will usually read infinite ohms. An older Ge diode may have a
much higher level of reverse leakage current, so it may show a noninfinite value. When in doubt, try to compare the reading with
measurements done on a good diode of the same type.

(6.3) Testing LED’s:
LED diodes usually have a forward voltage drop too high to test with most
multimeters, so you should use a similar circuit as the one described above.
Make sure to use a power supply greater than 3V and a suitable current limiting
series resistor. A small current of 1-10 mA will be enough to light most LEDs
when connected in the circuit.

(6.4) Resistor Testing:
Instructions
–

Connect the black and red probes to the proper terminals on the face of the
multimeter. The black probe is connected to the "COM" terminal on the
multimeter, and the red probe is connected to the terminal marked with an
ohm symbol for resistance.

–

turn the multimeter dial to the resistance setting.

–

Power off the circuit containing the resistor you wish to measure. Never
measure a resistor in a circuit with a live current running through it.

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–

Discharge any capacitors in the circuit by touching the leads of a spare, high
wattage resistor to the leads of the capacitors. Keep the leads jumped for
several seconds to fully discharge any stored power.

–

Touch one multimeter probe to each lead of the resistor. If the leads are not
accessible, touch the probes to the point where the lead is soldered to the
circuit. Since resistors are not a directional component (electricity flows
freely in both directions across the component) you may connect either probe
to either lead of the resistor without altering your reading.

–

Observe the reading on the display. A good resistor should test within its rated
range. A bad resistor will either show infinite resistance or a measurement far
higher than its rated resistance. In either case the resistor is no longer
functioning properly.

(6.5) Capacitor Testing:
–

Testing- Testing capacitors can be tricky at best. The quick and easy way
for the average home electrician is to hook up your multimeter to the
discharged leads of the capacitor. You will have to find the polarity of the
capacitor, and then hook up the corresponding meter leads.

–

Unfortunately with most meters, unless it's very new or expensive, you will
only be checking if the capacitor is shorted or not. Also, in most cases, you
will need to take at least one lead off the circuit card. Once your leads are
hooked up as stated above, your readings should be: Any capacitor that
measures a few ohms or less is bad. Most should test infinite even on the
highest resistance range.

–

For electrolytes in the µF range or larger, you should be able to see the cap
charge when you use a high ohms scale with the proper polarity, the
resistance will increase until it goes to infinity. If the capacitor is shorted,

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then it will never charge. If it is open, the resistance will be infinite
immediately and won't change. If the polarity of the meter leads are reversed,
it will not charge properly either, which is why you must determine the
polarity of your meter and mark it, they are not all the same.

(7) RESULTS AND DISCUSSIONS
(7.1) RESULT:
The location of the object has been found.

(7.2) DISCUSSIONS:
How does GPS works?
Global Positioning System satellites transmit signals to equipment on the ground.
GPS receivers passively receive satellite signals; they do not transmit. GPS receivers

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require an unobstructed view of the sky, so they are used only outdoors and they
often do not perform well within forested areas or near tall buildings. GPS operations
depend on a very accurate time reference, which is provided by atomic clocks at the
U.S. Naval Observatory. Each GPS satellite has atomic clocks on board.

Figure 6.2.1
Each GPS satellite transmits data that indicates its location and the current time. All
GPS satellites synchronize operations so that these repeating signals are transmitted
at the same instant. The signals, moving at the speed of light, arrive at a GPS receiver
at slightly different times because some satellites are farther away than others. The
distance to the GPS satellites can be determined by estimating the amount of time it
takes for their signals to reach the receiver. When the receiver estimates the distance
to at least four GPS satellites, it can calculate its position in three dimensions.
There are at least 24 operational GPS satellites at all times. The satellites, operated
by the U.S. Air Force, orbit with a period of 12 hours. Ground stations are used to
precisely track each satellite's orbit.

Determining Position:
A GPS receiver "knows" the location of the satellites, because that information is
included in satellite transmissions. By estimating how far away a satellite is, the
receiver also "knows" it is located somewhere on the surface of an imaginary sphere

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centered at the satellite. It then determines the sizes of several spheres, one for each
satellite. The receiver is located where these spheres intersect.

Figure 6.2.2

(8) ADVANTAGES, APPLICATIONS AND
LIMITATIONS
(8.1) ADVANTAGES:
It Can be Used to Locate Lost Items
The crime rate keeps on increasing in every part of the world and a lot of highly
valuable objects have been, and will, be stolen. It doesn’t matter how irrelevant you
think an object or equipment is to others if it is something that is very expensive you

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should make sure you install a GPS tracking system on it; for example, a $2 million
violin was once stolen from a café in London and the owner had a hard time finding
it, if the owner of this highly expensive violin had installed a GPS tracking system in
her violin it will be very easy for her to locate it.It is almost impossible to reduce the
crime rate in the world because new technologies are emerging and it is new
technologies that encourage crime and stealing; however, you can make it easier for
you to track any valuable object you own by installing a GPS tracker in it.

Figure 7.1.1

It Can be Used to Track Things and People
 One great function of a GPS system is that it can be used to track anything
irrespective of it being static or flexible, it can also be used to track people
and animals depending on what you need it for. Another great feature of a
GPS system that makes it better is the alarm system it has; for example, you
can easily install a GPS tracking system in a vault where valuable goods are
so that you can be alarmed anytime someone is trying to steal them.

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 You can also use the GPS technology to ensure things are going fine with
people working for you especially if they’re doing a job that requires a high
level of security and confidentiality; this will be able to track them anywhere
they go and when they go there.
It Can be Used Anywhere in the World
An added advantage of the GPS system is that it can be used anywhere in the world;
it doesn’t matter whether you’re in Africa or Asia the GPS technology is
powered by the world satellites and this means it can be accessible
anywhere; all you need is a solid tracking system and a GPS receiver.

(8.2) APPLICATIONS:
GPS technology has matured into a resource that goes far beyond its original design goals.
These days people from a plethora of professions are using GPS in ways that make
their work more productive, safer, and sometimes even easier. There are five main
uses of GPS today:
Location- determining a basic position.
Navigation- getting from one location to another.
Tracking- monitoring the movement of people and things.
Mapping- creating maps.
Timing- providing precise timing.

Timing:
The first and most obvious application of any Location Based Service such as GPS is
the simple determination of a “position” or location. GPS was the first
positioning system to offer highly precise location data for any point on the

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planet, in any weather. Knowing the precise location of something, or
someone, is especially critical when the consequences of inaccurate data are
measured in human terms.

Navigation:
GPS helps you determine exactly where you are, but sometimes it is more necessary
to know how to get somewhere else. Recall that GPS was originally
designed to provide navigation information for ships and planes. So it’s no
surprise that while this technology is appropriate for navigating on water,
it’s also very useful in the air and on the land.

Tracking:
 GPS used in conjunction with communication links and computers can
provide the backbone for systems tailored to applications in agriculture, mass
transit, urban delivery, public safety and vessel and vehicle tracking.
Therefore, more and more police, ambulance and fire departments are
adopting systems like GPS- based AVL Manager to pinpoint both the location
of the emergency and the location of the nearest response vehicle on a
computer map.
 With this kind of clear visual picture of the situation, dispatchers can react
immediately and effectively.

Mapping:
Mapping the planet has never been an easy task, but GPS today is being used to
survey and map it precisely, saving time and money in this most stringent of all
applications. GPS can help generate maps and models of everything in the world,
mountains, sea, rivers, cities, and help manage endangered animals, archaeological
treasures, precious minerals and all sorts of resources, as well as accurately
managing the effect of damage and disasters.

Timing:

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GPS can also be used to determine precise to determine precise time, time intervals
and frequency. There are three fundamental ways we use time:
 As a universal marker,
 As a way to synchronize
 To provide an accurate, unambiguous sense of duration.

(7.3) LIMITATIONS:
The following limitations are:



Cost:
 Purchasing a GPS based on price can be a major disadvantage.
 If you purchase a "bargain GPS," you will get what you pay for, and features
such as traffic and up-to-date maps could be lacking.

 Directions:
 Turn-by-turn directions are not available on every type of GPS device.
 Some will give very little advanced notice before an upcoming turn.

 Accuracy:
 Maps on GPS devices are not updated in real time for all models.
 This means that it is possible a GPS device will direct you onto a road that is
closed or no longer exists. It could also miss new roads and businesses.

 Battery Life:
 GPS units that are not plugged into a power source, and rely on batteries,
which can drain quickly.

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 This can increase the cost of owning a GPS unit significantly

(9) CONCLUSIONS

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The technology of the Global Positioning System is allowing for huge
changes in society. The applications using GPS are constantly growing. The
cost of the receivers is dropping while at the same time the accuracy of the
system is improving. This affects everyone with things such as faster Internet
speed and safer plane landings.
Even though the system was originally developed for military purposes, civil
sales now exceed military sales (See Figure 8.1 below).

Figure 8.1

(10) FUTURE OF THE PROJECT

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With GPS tracking systems popping up in cell phones, watches, and shoes, there's no
doubt that GPS tracking devices are making their way into all walks of daily life.
Considering the increased popularity of GPS tracking systems, what can we expect
from the next generation of these tracking devices?

Increased Business Use:
 Even as businesses are rapidly turning to GPS tracking systems to help them
with daily operations, such as vehicle tracking, employee monitoring, and
theft prevention, we can only expect the use of GPS tracking systems to
increase in the next few decades.
 As technology continues to evolve, GPS tracking devices will continue to
decrease in size, increase in accuracy, and be utilized by even more
businesses as a common, yet powerful tool.

Business Opportunities:
 As more businesses demand the conveniences and fiscal benefits offered by
GPS tracking systems, the demand for distributors of GPS tracking
equipment and service providers will certainly increase.
 GPS tracking systems represent an already profitable business opportunity
that will only expand as demand continues to rise.

Advancements in Software:
 Already highly-sophisticated, GPS tracking software plays a key role in how
businesses use GPS tracking systems to meet their needs.
 As satellite mapping and computer imagery continue to advance, so will the
capabilities and applications for GPS tracking software.

Personal Safety:
 Unfortunately, it seems that violent crimes and abduction are going to be a
horrible reality for this and future generations.

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 Personal GPS tracking systems are already being used to enhance the safety
of many children and adults, and as GPS tracking systems continue to
become more affordable, it's likely that they'll be used even more for this
purpose.