A Standalone Approach for Ultra-Tightly Coupled High Sensitivity GNSS Receiver

T. Ren, M. Petovello, C. Basnayake

Abstract:	The tracking threshold in conventional scalar-based GNSS receivers limits the performance of ML bit decoding, which is paramount to ML based bit wipe-off. In this paper, a standalone approach, that is, in the absence of aiding information, is proposed for the ultra-tightly coupled high sensitivity GNSS receiver. The benefits are analyzed and determined of using ultra-tightly coupled GNSS receiver in the standalone mode to improve bit decoding and navigation solutions. The results show the ultra-tight receiver is more robust than the GNSS-only receivers. In the context of GPS L1 C/A signals, the field test results show ultra-tight receiver can improve the successful decoding rate (SDR) compared to scalar-based receiver. Compared to the vector-based receiver, the ultra-tight receiver is more immune to the high BER problem in extending coherent integration time. The position and velocity accuracy of the standalone ultra-tight receiver has been improved more than 40% after extending coherent integration time in the vehicular navigation test in urban canyon. A newly proposed signal power based update observation selection strategy has helped to mitigate multipath impacts.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	884 - 897
Cite this article:	Ren, T., Petovello, M., Basnayake, C., "A Standalone Approach for Ultra-Tightly Coupled High Sensitivity GNSS Receiver," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 884-897.
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