Investigating Delay Compensation within the Context of Frequency-Aided PLL.
International Conference on Localization and Global Navigation Satellite System(2024)
Abstract
The transition from analog GNSS receivers to digital ones has spurred the emergence of various GNSS baseband signal processing algorithms. Among these, Frequency-aided PLL has been widely investigated in different forms, including FLL-assisted PLL, VFLL, etc. Great contributions have been made in the practical implementation and evaluation of different forms of Frequency-aided PLLs, but the impact of frequency aid information delay has not been thoroughly analyzed quantitatively. To date, only preliminary impact analysis in S domain is available in few literature sources. This paper mainly addresses the problem in Z domain that is more aligned with practical implementations. Two distinct types of Frequency-aided PLL are firstly proposed and a quasi-FLL-assisted PLL considering the frequency aid delay is chosen to be analyzed. Additionally, delay compensation is also derived using the Controlled-Root method to counteract the impact of delay, providing a valuable insight into the problem of frequency aid delay in other models.
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Key words
GNSS receiver,Frequency-Aided PLL,VFLL,Controlled-Root
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