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Published in:
2021 | OriginalPaper | Chapter
A Vector Tracking Structure of FLL-Assisted PLL for GNSS Receiver
Authors : Minghui Mou, Yuan Hu, Mingxing Gu, Shengzheng Wang, Wei Liu
Published in: China Satellite Navigation Conference (CSNC 2021) Proceedings
Publisher: Springer Singapore
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Abstract
Satellite-based navigation applications have become one of the most common navigation methods in the world. The tracking of satellite navigation receiver in weak signal environments is challenging. To improve receiver tracking performance, a frequency locked loop (FLL) assisted phase locked loop (PLL) vector tracking structure for GNSS receiver is proposed in this paper. In the carrier loop, a carrier tracking algorithm of Kalman filter (KF)-based FLL-assisted PLL is used. In the code tracking loop, the pseudo-range information is fed back to the code numerically controlled oscillator (NCO) through vector tracking, and the code frequency of each tracking channel is adjusted to realize the information sharing of all channels. Experimental results show that, the FLL-assisted PLL vector tracking algorithm can quickly re-lock the satellite signal with good robustness after severe signal fading.