GPS Doppler Processing for Precise Positioning in Dynamic Applications

Javad Ashjaee

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-base, carrier-base, 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. Bach one second position fix, which is provided in both polar and cartisian coordinates, is based on a complete and independent set of measured data, with no hypothetical modeling, interpolation, or extrapolation.
Published in:	Proceedings of the 1986 National Technical Meeting of The Institute of Navigation January 21 - 23, 1986 Long Beach, CA
Pages:	121 - 128
Cite this article:	Ashjaee, Javad, "GPS Doppler Processing for Precise Positioning in Dynamic Applications," Proceedings of the 1986 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1986, pp. 121-128.
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