Global Navigation Satellite System (GNSS) Vector Correlator: Harnessing Satellite Direction Cosine Diversity for Robust Positioning
Technical Report,31 Jul 2015,07 May 2019
University of Illinois Urbana United States
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The contractor investigated vector correlator as an alternative to the bank of parallel scalar correlators typically found in a conventional tracking receiver design. The vector correlator is different from vector tracking architectures by moving the correlation peak search into the physical domain the three spatial dimensions and the additional time dimension. After the receivers navigation filter has produced an estimate of the next anticipated receiver state, differential offsets from this state are generated in all four dimensions and translated into pseudorange offsets via the receiver-satellite geometry. With external knowledge of the navigation data bit stream for each satellite, precise code and carrier replicas are generated for each differential offset, and a composite replica signal is used to correlate against the raw signal arriving from the receiver front-end. Results from this spatial correlation peak search are fed back to the navigation filter, closing the loop.
- Navigation and Guidance