Our Seminar Embedded

7/31/2019 Our Seminar Embedded

1/22

GPS ENABLED VEHILCETRACKING SYSTEM


2/22

POINTS TO BE PRESENTED

NEED OF GPS

HOW GPS WORKS

COMPONENT OF GPS

OUR REQUIREMENT ANALYSIS DFD DIAGRAMS

CLASS DIAGRAMS

CONCLUSION

REFERENCES


3/22

Trying to figure out where youare is probable mans oldestpastime.

Finally US Dept of Defensedecided to form a worldwidepositioning system.

Also known as NAVSTAR (

Navigation Satellite Timing andRanging Global positioningsystem) provides instantaneousposition, velocity and timeinformation.


4/22

Space Segment Control Segment User Segment

GPS


5/22

24 GPS spacevehicles(SVs).

Satellites orbit the

earth in 12 hrs. 6 orbital planes

inclined at 55 degreeswith the equator.

This constellationprovides 5 to 8 SVsfrom any point on theearth.


6/22

The control segment comprises of 5 stations. They measure the distances of the overhead

satellites every 1.5 seconds and send the corrected

data to Master control. Here the satellite orbit, clock performance andhealth of the satellite are determined anddetermines whether repositioning is required.

This information is sent to the three uplinkstations


7/22

It consists of receivers that decode the signalsfrom the satellites.

The receiver performs following tasks: Selecting one or more satellites

Acquiring GPS signals

Measuring and tracking Recovering navigation data


8/22

The Precise Position Service PPS is the highest level of dynamic positioning

based on the dual freq P-code

The P-code is a very long pseudo-random bi phasemodulation on the GPS carrier which does notrepeat for 267 days

Only authorized users, this consists of SPS signalplus the P code on L1 and L2 and carrier phasemeasurement on L2


9/22

Control Segment

Space Segment

User Segment

Monitor Stations

GroundAntennas

Master Station


10/22

Requirements Triangulation from satellite Distance measurement through travel time

of radio signals Very accurate timing required To measure distance the location of the

satellite should also be known Finally delays have to be corrected


11/22

T + 3Distance between satellite and

receiver = 3 times the speed of

light

TSignal leaves satellite at

time T

Signal is picked up by the

receiver at time T + 3


12/22

Position is calculatedfrom distancemeasurement

Mathematically weneed four satellitesbut three aresufficient byrejecting theridiculous answer


13/22


14/22

GENENRAL DESCRIPTION

FUNCTIONAL REQUIREMENTS

DATA REQUIREMENTS

NON FUNCTIONAL REQUIREMENTS


15/22

CONSTRAINTS ASSUMPTION & DEPENDENCIES

OS REQUIRED WINDOWS 98 & UP CURRENT RELEASES WEB BROWSER

WIRELESS CONNECTION REQUIRED TO VIEW MAP .NET FRAMEWORK IS NEEDED

FIREWALLS etc MUST BE SET ON


16/22

0 level DFD

Signal from satellite

User location with attributes


17/22

1 level DFD

user

Idcode

Gps

Constantlytransmitting signal

Tellexactpostn

24 satellite network

Login id & passw


18/22

LOGIN

PSEUDORANDOM CODE

EPHEMERIC DATA

ALMANIC DATA

LCD/CU

ADMIN

USER

GPSRECE

VR

24SATELLITE


19/22

DATABASE

USER

INTERFACE

1.ENTER PWD

3.VERFIED

2.VERIFY

4.PASSWORDACCEPETED


20/22

ELEMENT

X,Y:INT

GETX(),GETY(),SETX(),SETY(),SETPOSITION(),GET

POS()

STREET

STREET:CHAR

GETSTATE();SETSTATE();

STRRET();

BUILDING

DOOR:CHARGETDOOR(),SETDOOR(),

BUILDING()

CITY

X,Y:INT

GETCURRENT()HASNORTH()HASSOUTH()

HASEAST()

HASWEST()


21/22


22/22

Documents

Our Seminar Embedded