Performance of the TCAR Method in Multipath and Jamming Environments

Wolfgang Werner, Bernd Eissfeller, Zongzhou Fu, Günter W. Hein

Abstract:	In this paper the results from a Monte-Carlo simulation for using the ESA TCAR (three carrier ambiguity reso-lution) method are presented. It is shown, that in ideal environment (no multipath, no jamming) the direct fixing of the carrier phase ambiguities is reliably possible. However, in case of real multipath and jamming condi-tions, the method leads to incorrect fixes and quite big residual range errors. Dependent on the code and carrier variances the algorithm's steps can lead to false fixings of the super-widelane, widelane or the original wavelength ambiguity, what results in discrete residual range errors in multiples of the respective wavelengths, i.e. 10.47 m, 0.801 m and 0.189 m. The simulation results for the TCAR method in ideal conditions, multipath environment and jamming condi-tions are shown. Making use of differential methods prior to application of TCAR only increases the meas-urement noise and leads to even worse results. As a conclusion it can be stated, that if the TCAR method is to be used in a ENSS, the code-noise of at least one frequency has to be minimized by a wider bandwidth (making the use of a narrow-correlator re-ceiver possible) or by a higher code-chiprate.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	1385 - 1394
Cite this article:	Werner, Wolfgang, Eissfeller, Bernd, Fu, Zongzhou, Hein, Günter W., "Performance of the TCAR Method in Multipath and Jamming Environments," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 1385-1394.
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