Gps is the most one of thing in every future...because in future there is only depends upon the GPS.for the find out the unknown things and Places

1. S.SIVA KUMAR
N.MANJULA
IV B.TECH
CIVIL ENGINEERING
GLOBAL POSITIONING SYSTEM
A PRESENTATION
ON
PRESENTED BY
.

3. WHAT IS
GPS?• Satellite based
navigation system.
• Developed by the
United States
Department of
Defense (DOD)

4. WHAT IS
GPS?
• Can provide accurate
positioning 24 hours
a day, anywhere in
the world.
• GPS satellites also
called NAVSTAR,
the official U.S.
DOD name for GPS

5. STRUC
TURE
Space Segment Control Segment
User Segment

6. HOW GPS
DETERMINES A
LOCATION
Things which need to be determined:
• Current Locations of GPS Satellites
• The Distance Between Receiver’s Position and the GPS
Satellites

7. CURRENT LOCATIONS OF
GPS SATELLITES
• GPS satellites are orbiting the earth at an altitude
of 11,000 miles.
• The orbits, and the locations of the satellites, are
known in advance.
• GPS receivers store this orbit information for all of
the GPS satellites in an ALMANAC*.
* THE ALMANAC IS A FILE WHICH CONTAINS POSITIONAL INFORMATION FOR ALL OF THE
GPS SATELLITES

8. • All 24 satellites are
divided into 6 parts.
• There are 4 satellites
in each part.
• A definite orbit is
defined for each part.
• Each of these 3,000-
to 4,000-pound solar-
powered satellites.

9. DISTANCE BETWEEN
RECEIVER’S POSITION
& THE GPS SATELLITES• By measuring the amount of time taken by
radio signal (the GPS signal) to travel from
the satellite to the receiver.
• Radio waves travel at the speed of light, i.e.
about 186,000 miles per second.
• The distance from the satellite to the receiver
can be determined by the formula “distance =
speed x time”.

10. MEASURING GPS
ACCURACY
The geometry of the constellation is evaluated by
Dilution Of Precision, or DOP.
DOP

11. INCREASING
ACCURACY OF GPS• Differential correction provides accuracy within 1-5 m.
• Coarse Acquisition receiver provides accuracy within
1-5m.
• Carrier Phase receivers provides accuracy within 10-30
cm.
• Dual-Frequency receivers are capable of providing sub-
centimeter GPS position accuracy.

12. APPLICA
TIONS
AVIATION AGRICULTURE
MARINE TIMING

13. SPACE RAILWAYS
ROADWAYS DISASTER RELIEF

14. Name Launch Date
NAVSTAR 64 (USA 206) August 17, 2009
NAVSTAR 63 (USA 203) March 24, 2009
NAVSTAR 62 (USA 201) March 15, 2008
NAVSTAR 61 (USA 199) December 20, 2007
NAVSTAR 60 (USA 196) October 17, 2007
NAVSTAR 59 (USA 192) November 17, 2006
NAVSTAR 58 (USA 190) September 25, 2006
NAVSTAR 57 (USA 183) September 26, 2005
NAVSTAR 56 (USA 180) November 6, 2004
NAVSTAR 55 (USA 178) June 23, 2004
NAVSTAR 54 (USA 177) March 20, 2004
NAVSTAR 53 (USA 175) December 21, 2003
NAVSTAR 52 (USA 168) March 31, 2003
GPSOperationalSatellites