The Global Positioning System Advanced Tools. Sources of GPS Error. Standard Positioning Service (SPS ): Selective Availability: 0 to 100 meters Ionosphere: 5.0 to 7.0 meters Troposphere: 0.5 to 0.7 meters Satellite clocks: < 1 to 3.6 meters Orbital errors: < 1 meter
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Signal propagates through atmosphere at different rates due to different frequencies.
This time difference can be calculated and used to correct for Ionospheric and Tropospheric created errors.
Trimble’s Pro XR
Trimble Geo CE
XT and XM
Trimble GPS Pocket
GPS Enabled Digital
Racal Project 25 Voice / Data Radio
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