GPS Signal Errors
Measurement Errors
Range uncertainty (Due
to clock/Atmospheric error)
Errors in position
Intersection area with
error
Errors in GPS Signal
Orbit error
Ionospheric error
Topospheric error
Receiver noise
Multipath
Jamming
System and Receiver errors
Clock error
Transmission delay
Imprecision in algorithm for range decoding
Multi path errors
Causes of Range Uncertainty
Ionospheric effects 3 meter
Atmospheric effects 0.5 meter
Satellite/system errors 2
meters
Receiver errors 0.5
meter
Multipath depends
Total Range Error 6
meters
TOTAL Positional Error 10
meters
GPS accuracy of GPS depend on
Dependent errors
Noise
Multipath
Receiver
hardware limitation
Independent errors
Satellite
clock errors
Error in
broadcast ephemeris data
Signal
propagation delay due to Ionosphere and Troposphere
Differential GPS
The differential correction techniques used to enhance the quality of
location data gathered GPS receivers.
Differential correction can be applied in
Real-time directly from the field
When postprocessing data in the office
Combining both methods provides flexibility during data collection and
improves data integrity
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