THE STOCHASTIC ESTIMATION OF SATELLITE CLOCK CORRECTION INFORMATION IN WADGPS
Author(s): Hüseyin Baki lz, GE Maorong, Esmond Mok
Pages: 66-69
Year: 2000 Issue: 1
Journal: GEO-SPATIAL INFORMATION SCIENCE
Keyword: stochastic model; wide area differential GPS(WADGPS); selective availabil ity;
Abstract: Using autocorrelation information of the pseudorange errors generated by se lective availability (SA) frequency dithering, we have constructed a simple first order stochas tic model for SA effects. This model has been used in a Kalman filter to account for the stochastic behavior of SA dithering in estimating satellite clock information in wide area dif ferential GPS. We have obtained fifteen percent improvement in the user positioning using the correlation information on the satellite clock information in a Kalman filter, when comparing the results obtained using a regular least square estimation.
Pages: 66-69
Year: 2000 Issue: 1
Journal: GEO-SPATIAL INFORMATION SCIENCE
Keyword: stochastic model; wide area differential GPS(WADGPS); selective availabil ity;
Abstract: Using autocorrelation information of the pseudorange errors generated by se lective availability (SA) frequency dithering, we have constructed a simple first order stochas tic model for SA effects. This model has been used in a Kalman filter to account for the stochastic behavior of SA dithering in estimating satellite clock information in wide area dif ferential GPS. We have obtained fifteen percent improvement in the user positioning using the correlation information on the satellite clock information in a Kalman filter, when comparing the results obtained using a regular least square estimation.
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