Joint Acquisition of GNSS Codes via Coherent Combining of Multi-Frequency Composite Quadrature Signals

Chun Yang and Andrey Soloviev

Abstract:	One of the performance enhancing features of modernized GNSS signals is the transmission of multiple service signals on the same frequency, which are coherent and synchronous. Conventional methods process individual codes separately and independently. If the signals can be received coherently and synchronously, it is possible to perform the joint acquisition of multiple codes, leading to an improved signal to noise ratio (SNR). However, the codes modulated on the same carrier often have different periods and chipping rates and, more importantly, the bits of the payload data are of signs. Therefore, a viable joint detection and estimation procedure needs to take these factors into consideration with a coherent combining statistic designed to deal with additional complexities involved. To test the idea, we built a software defined radio (SDR) receiver with a tri-band antenna that is capable of acquiring and tracking all open-service GNSS signals (GPS, GLONASS, Galileo, and BeiDou). In particular, we demonstrated with experimental data the joint acquisition via coherent combining of GPS L2CM, L2CL; GPS L5I and L5Q; Galileo E1B and E1C, Galileo E5aI, E5aQ, E5bI and E6bQ, respectively. The all GNSS SDR receiver and the joint acquisition with coherent combining method are described in this paper, together with the field test results analyzed.
Published in:	Proceedings of the 2016 International Technical Meeting of The Institute of Navigation January 25 - 28, 2016 Hyatt Regency Monterey Monterey, California
Pages:	805 - 819
Cite this article:	Yang, Chun, Soloviev, Andrey, "Joint Acquisition of GNSS Codes via Coherent Combining of Multi-Frequency Composite Quadrature Signals," Proceedings of the 2016 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2016, pp. 805-819. https://doi.org/10.33012/2016.13489
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