1. LOBAL OSITIONING YSTEM
GPS 1

2. 2
GPS

3. 3
GPS

4.  Need signal from at least four
SVs for 3D position
 One SV provides a time
reference
 Distance to three remaining SVs
is determined by observing the
GPS signal travel time from SV
to the receiver
 With three known points, and
distances to each, we can
determine the GPS receiver’s
position (trilateration)
GPS 4

5. The Global
Positioning System
is a constellation of
31 satellites that
is used to calculate
your position.
GPS 5

6. GPS 6

7.  Fast speed  Not very cheap
 Leads us in right  People focus on GPS
direction more than road which
 Helps improve causes accident
mapping skills  Needs good care and
 Makes navigation easier handling
 External power
GPS 7

8.  The United States
Department of
Defense developed
the system, officially
named NAVSTAR
GPS (Navigation
Signal Timing and
Ranging Global
Positioning System),
and launched the
first experimental
satellite in 1978.
GPS 8

9.  Largest source is due to the atmosphere
 Atmospheric refraction
 Charged particles
 Water vapor
Ionosphere
(Charged Particles)
Troposphere
GPS 9

10.  Geometry of satellite positions
 Satellite clock errors
 SV position or “ephemeris” errors
 Quality of GPS receiver
 Multi-path errors
GPS 10

11.  Military.
 Search and rescue.
 Disaster relief.
 Surveying.
 Marine, aeronautical and terrestrial navigation.
 Satellite positioning and tracking.
 Shipping.
GPS 11

12. GPS 12

13.  Position and coordinates.
 The distance and direction between any two
waypoints, or a position and a waypoint.
 Travel progress reports.
 Accurate time measurement.
GPS 13

14. GPS 14

15. GPS 15