Global Positioning System
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Transcript of Global Positioning System
20/01/2013 1
Using GPS Techniques in
Surveys
20/01/2013 2
Navigation and Positioning are
Crucial to So Many Activities
20/01/2013 3
GPS Satellites
20/01/2013 4
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20/01/2013 6
Geometric Idea, Using a Satellite
20/01/2013 7
Using 2 Satellites
20/01/2013 8
Using 3 Satellites
20/01/2013 9
Mathematical Idea; V * T = D
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Satellites Have Precise Atomic Clocks
20/01/2013 13
20/01/2013 14
Precise Orbit
20/01/2013 15
GPS Satellites Positions are very
Predictable
20/01/2013 16
Radar Checks each Satellite
Altitude, Position and Speed
20/01/2013 17
Minor Variations
20/01/2013 18
Earth’s Atmosphere Causes Delays in
the GPS Signals
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Ionosphere & Troposphere,
Error Sources
20/01/2013 20
Multi-path Error
20/01/2013 21
Ephemeris Errors, GDOP
20/01/2013 22
Good Configuration
20/01/2013 23
Differential GPS
20/01/2013 24
Static Surveying by GPS
GPS at reference station
Remote/rover receiver
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Rapid Static Surveying by GPS
GPS at reference station
Remote/rover receiver
20/01/2013 26
Kinematic Surveying by GPS
GPS at reference station
Remote/rover receiver
Initialization station
20/01/2013 27
GPS Applications
Location
Navigation
Tracking
Mapping
Timing
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20/01/2013 29
i
X1
Y1
Z1
Z2
Y2
X2
i
r0
ri
Z
X Y
وسائط التحويل
20/01/2013 30
Topcon , Software and
Hardware
20/01/2013 31
Transformation Parameters
between Satellite & Geodetic
Systems
3 Translations:
X Y Z
3 Rotations:
X Y Z
1 Scale Difference:
S