Javad Ashjaee

Peer Reviewed

Abstract: In this paper we show that the judicious use of all the information available from C/A code can provide results better than the reported accuracy of P code, with much lower cost. This performance, however, is limited to low-dynamic, low-jamming environments which are typical of civilian applications. The elegance of P-code is primarily manifested in high dynamic vehicles (jets and missiles) and in jamming environments. Results are provided in stationary and low-dynamic cases based on code-phase, carrier-phase, doppler, and integrated doppler measurements from TRIMBLE 4000 receivers. In particular, it is shown that the relative or differential accuracy of better than 10 centimeters can be achieved in low-dynamic applications. Position fixes are obtained every second, after a short time of initial calibration and tracking. The improved accuracy is based on aiding the code-phase measurements with integrated doppler. Each one second position fix, which is provided in both polar and Cartesian coordinates, is based on a complete and independent set of measured data, with no hypothetical modeling, interpolation, or extrapolation.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 32, Number 4
Pages: 370 - 385
Cite this article: Ashjaee, Javad, "GPS DOPPLER PROCESSING FOR PRECISE POSITIONING IN DYNAMIC APPLICATIONS", NAVIGATION: Journal of The Institute of Navigation, Vol. 32, No. 4, Winter 1985-1986, pp. 370-385.
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