1. …
START

2. Presented By
D E E PA K K U M A R - 1 0 / E C E / 5 4

3. Index
INTRODUCTION
HISTORY
HOW IT WORKS?
APPLICATION
CONCLUSION

5. “where
am I ?”
Nearest
restaurants ,
Fueling Station ,
Tourist Attraction
Which road
should I take to
get my
destination.
The shortest
route between
two location.

6. Three Segments of the GPS
Space Segment
User Segment
Control Segment
Ground
Antennas
Master Station
Monitor Stations

7. Position Of Satellite & Receiver
Distance between satellite
and receiver = ―3 times the
speed of light‖
Satellite

8. Devices
A.
B.
C.
D.
GPS Watch
PDA with GPS
Mobile Phone
Hand Held

9. History
1969 – Defense
Navigation satellite
system (DNSS) formed.
1993 -- 24th Satellite
Launched ; initial
Operational Capability.
1973 – NAVSTAR
Global Positioning
System developed.
1995 – Full operational
capability.
1978 – First Four
satellites launched,
Delta Rocket Launch.
MAY 2000 – Military
accuracy available to
all users.

10. Components of the System
Space segment
24 satellite vehicles
Six orbital planes
• Inclined 55o with respect to equator
• Orbits separated by 60o
20,200 km elevation above
Earth
Orbital period of 11 hr 55 min
Five to eight satellites visible
from any point on Earth
• Block I Satellite Vehicle

11. GPS Satellite Vehicle
Four atomic clocks
Three nickel-cadmium
batteries
Two solar panels
S band antenna—satellite
control
12 element L band antenna—
user communication
Block IIF satellite vehicle
(fourth generation)
• Battery charging
• Power generation
• 1136 watts

12. GPS Satellite Vehicle

13. Control Segment
US Space Command
Cape Canaveral
Hawaii
Kwajalein Atoll
Ascension
Is.
Master Control Station
Diego Garcia
Monitor Station
Ground Antenna

14. GPS Communication and Control

15. How does GPS work?
Satellite ranging
Satellite locations
Satellite to user distance
Need four satellites to determine
position
Distance measurement
Radio signal traveling at speed of light
Measure time from satellite to user
Low-tech simulation

16. How does GPS work?

Distance to a satellite is determined by measuring how long
a radio signal takes to reach us from that
satellite.



To make the measurement we assume that both the satellite
and our receiver are generating the same pseudo-random
codes at exactly the same time.
By comparing how late the satellite's pseudo-random code
appears compared to our receiver's code, we determine how
long it took to reach us.
Multiply that travel time by the speed of light
and you've got distance.

17. System Performance
Standard Positioning System

18. Application of GPS
Technology
LOCATION –
NAVIGATION –
Determining a basic
position
Getting from one
location to another
TRACKING –
MAPPING –
Monitoring the movement of
people and things
Creating maps of the world
TIMING –
Bringing precise timing to
the world

19. User Segment
Military.
Search And Rescue.
Disaster Relief.
Surveying.
Marine, Aeronautical And Terrestrial Navigation.
Remote Controlled Vehicle And Robot Guidance.
Satellite Positioning And Tracking.
Shipping.
Geographic Information Systems (GIS).
Recreation.

20. CONCLUSION
So, we have seen that Global
positioning system is very
popular & Essential to us . So,
we can say, in future it will be
developed more & more by
taking help of advanced science
& technology & we can use it in