Dual-component Combined Tracking of GPS L5 Signals
Dongyang Xu, Yanhong Kou · Zhongguo kexue. Wulixue Lixue Tianwenxue · 2011
The transmission of GPS L5 signal in Block -IIF satellites opens the door for many new GPS applications. This paper explores different tracking strategies of L5 signals, including pilot only tracking, data only tracking and dual-component combined tracking. The tracking threshold and accuracy of different combination methods for PLL and DLL of combined tracking are evaluated using the tracking results of simulated digital IF signals. For carrier tracking, the correlator-output-combination achieves the highest accuracy but its tracking threshold is between that of pilot only tracking and data only tracking. For code tracking, the tracking accuracy of the filter-output-combination outperforms the correlator-output-combination a bit only at low C/N0s but at the cost of two independent code discriminators and filters. The processing results of collected SVN62 signals are also included to support the analysis.