Optimum Tracking Loop Design for the New L2 Civil Signal Based on ML Estimation

Dun Wang, Katsuo Yamada, Tsutomu Okada and Osamu Arai

Abstract:	A new signal tracking technique of Concurrent Tracking of Multiplexed Codes (CTMC) has been developed for the new L2 civil signal (L2C). This concurrent tracking technique is derived from the maximum likelihood (ML) estimation theory. Theoretical analysis reveals that the CTMC can improve the noise performance up to 3 dB both in phase tracking and in code tracking in comparison with only tracking one of the CL and CM codes of L2C signal; and meanwhile it has the advantage of tracking threshold improvement, which is obtained from tracking the no-data CL concerned signal component with a simple phase locked loop (PLL). The mathematic details of the derivation of CTMC loops have been given in this paper. The noise performance of these tracking loops has been evaluated by computer simulation and has been tested with receiver experiment. The results of both simulation and experiment are well consistent with the theoretical analysis results. They all showed that CTMC loops work better than only tracking one of the CL and CM codes.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	474 - 485
Cite this article:	Wang, Dun, Yamada, Katsuo, Okada, Tsutomu, Arai, Osamu, "Optimum Tracking Loop Design for the New L2 Civil Signal Based on ML Estimation," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 474-485.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In