Combining L1 Signals for Improved Sensitivity

Yu Hsuan Chen, Sherman Lo, Per Enge, Dennis Akos

Abstract:	Global Navigation Satellite System (GNSS) receiver developers have long sought to achieve higher sensitivity. This is beneficial for both civilian and military users. Improved sensitivity increases availability in urban and indoor environments and provides greater robustness against radio frequency interference (RFI). With the coming of GPS III, users will have new features that can be used to improve sensitivity. GPS III will provide multiple signals on multiple frequencies. These signals can be processed together to improve sensitivity. At GPS L1, a civilian user will have access to L1 C/A as well as L1C pilot and data. Additionally, military user will also have L1 P(Y) and M code. This paper examines combining different L1 signals to improve sensitivity and how to use the combination with other techniques such as extended averaging. The paper demonstrates results using on air data from the Japanese Quasi-Zenith Satellite System (QZSS). The goal of this phase is to enable and quantify the sensitivity benefits of combining future GPS L1 signals using our GNSS software defined radio (SDR) and broadcast signals. This paper is divided into two major parts. First part provides background on QZSS along with the combination technique and assessment methodology. The body of the paper discusses the data collected for the analysis and examines the resulting sensitivity performance of the combined technique with natural signal degradation and injected simulated noise.
Published in:	Proceedings of the 2015 International Technical Meeting of The Institute of Navigation January 26 - 28, 2015 Laguna Cliffs Marriott Dana Point, California
Pages:	164 - 172
Cite this article:	Chen, Yu Hsuan, Lo, Sherman, Enge, Per, Akos, Dennis, "Combining L1 Signals for Improved Sensitivity," Proceedings of the 2015 International Technical Meeting of The Institute of Navigation, Dana Point, California, January 2015, pp. 164-172.
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