Analysis and Verification of Synthetic Multicorrelators

C. Stober, F. Kneissl, Bernd Eissfeller, T. Pany

Abstract:	Multiple correlation values at distinct code chip and Doppler offsets provide new possibilities for signal assessment and monitoring as up to now normally no explicit observations in the Doppler domain are attained or utilized. Advantages of Doppler domain correlation values also arise for Multipath monitoring and assessment as the so called standing Multipath, which can fully be observed with classical multicorrelator techniques at zero Doppler offsets, do only describe a subset of the overall Multipath effect. Dynamic Multipath due to signal reflections can only be observed at distinct Doppler values. Advantages are also given for spoofing detection as for example certain types of spoofer attacks are likely to be seen within the Doppler domain. The aim of this paper is to investigate two-dimensional (code and Doppler) synthetic multicorrelators based on a Fast Fourier Transform (FFT) scheme. Whereas a conventional multicorrelator uses for each correlator independent code and carrier NCO, the so called synthetic multicorrelator has only independent code NCOs for different code offsets and realizes Doppler offsets with a post-correlation FFT. These synthetic multicorrelators provide the potential to substantially reduce the needed burden of computational work compared to real multicorrelators. In case of ASIC and FPGA receivers this reduction leads to less power consumption and/or less chip area usage. In case of software receivers based on general purpose CPUs it is even more interesting, as classical two-dimensional multicorrelation is significantly using computational resources.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2060 - 2069
Cite this article:	Stober, C., Kneissl, F., Eissfeller, Bernd, Pany, T., "Analysis and Verification of Synthetic Multicorrelators," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2060-2069.
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