Carrier Phase Tracking and Navigation Message Demodulation Approach for Vector Tracking Loops using Serial PLL

Sihao Zhao, Xiaowei Cui, Mengdi Jia, Zheng Yao, Mingquan Lu

Abstract:	Vector delay and frequency locked loop (VDFLL) has more robust signal tracking ability in signal degradation environment compared with the scalar locked loop (SLL) used in the conventional global navigation satellite system (GNSS) receivers. In order to add carrier phase tracking and navigation data demodulation capability to the VDFLL, this paper presents a serial PLL structure based on previous works. This serial PLL uses the carrier frequency estimated by VDFLL as its input and works independently so as not to affect the original VDFLL even if the PLL fails. This method provides VDFLL with carrier phase tracking ability and can be applied to cases requiring carrier phase information such as real time kinematic positioning. The proposed VDFLL with serial PLL approach is implemented based on a software global positioning system (GPS) receiver. Simulation data from a GPS signal generator and road-collected real data are used to test the presented serial PLL. The results show that the proposed serial PLL can track the carrier phase and demodulate the navigation bits correctly.
Published in:	Proceedings of the 29th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2016) September 12 - 16, 2016 Oregon Convention Center Portland, Oregon
Pages:	322 - 327
Cite this article:	Zhao, Sihao, Cui, Xiaowei, Jia, Mengdi, Yao, Zheng, Lu, Mingquan, "Carrier Phase Tracking and Navigation Message Demodulation Approach for Vector Tracking Loops using Serial PLL," Proceedings of the 29th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2016), Portland, Oregon, September 2016, pp. 322-327. https://doi.org/10.33012/2016.14638
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