Looking for an Optimum S-Curve Shaping of the Different MBOC Implementations

Matteo Paonni, Jose-Angel Avila-Rodriguez, Thomas Pany, Guenter W. Hein, Bernd Eissfeller

Abstract:	The objective of this paper is to find an optimum correlator configuration that is capable of achieving the best possible multipath mitigation performance for an MBOC modulated signal in all its different realizations. Having in mind that future receivers will receive both GPS and Galileo together, common configurations have been studied and trade-offs analyzed. First a review of the characteristics of the Multiplexed BOC (MBOC) signals and of the currently used code multipath mitigation techniques will be provided. After that, a new code multipath mitigation technique will be proposed and presented. The followed approach is the optimization of the shape of the code discriminator function (S-Curve Shaping), on account of the definition of an optimum S-curve. A fundamental aspect of the S-curve optimization will be to search the right compromise between bandwidth of the pre-correlation filter and the required resolution of the correlators. The method to calculate the weights of the correlators to obtain an optimum S-curve or to set up an optimum code-tracking-reference-function will be equally shown. The implementation of the optimum discriminator is illustrated and the results of several simulations are presented. Additionally, the obtained performance will be assessed by means of multipath envelopes. To conclude, a comparison of multipath performance figures using a statistical channel model is given.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	269 - 281
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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