24 - 25 October 2002, India International Centre, New Delhi, India
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Using GPS Velocity Information in Enhancement of GPS Position Accuracy


To generate an error model the auto-correlation and corresponding power spectral density (PSD) of the error signal must be estimated. The PSD of and errors is shown in Figure 2 and 3.




Figure 2. PSD of X Error


Figure 3. PSD of Y Error

The PSD has a gain of approximate 26db below 70mHz, continuing with a sharp roll-off of approximate 40db/decade up to 1000mHz where the magnitude starts to decrease at approximate 20db/decade.

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