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GPS ENABLED VEHILCETRACKING SYSTEM
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POINTS TO BE PRESENTED
NEED OF GPS
HOW GPS WORKS
COMPONENT OF GPS
OUR REQUIREMENT ANALYSIS DFD DIAGRAMS
CLASS DIAGRAMS
CONCLUSION
REFERENCES
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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.
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Space Segment Control Segment User Segment
GPS
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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.
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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
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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
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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
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Control Segment
Space Segment
User Segment
Monitor Stations
GroundAntennas
Master Station
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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
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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
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Position is calculatedfrom distancemeasurement
Mathematically weneed four satellitesbut three aresufficient byrejecting theridiculous answer
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GENENRAL DESCRIPTION
FUNCTIONAL REQUIREMENTS
DATA REQUIREMENTS
NON FUNCTIONAL REQUIREMENTS
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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
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0 level DFD
Signal from satellite
User location with attributes
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1 level DFD
user
Idcode
Gps
Constantlytransmitting signal
Tellexactpostn
24 satellite network
Login id & passw
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LOGIN
PSEUDORANDOM CODE
EPHEMERIC DATA
ALMANIC DATA
LCD/CU
ADMIN
USER
GPSRECE
VR
24SATELLITE
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DATABASE
USER
INTERFACE
1.ENTER PWD
3.VERFIED
2.VERIFY
4.PASSWORDACCEPETED
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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()
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