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An Optimized Vector Tracking Architecture for Pseudo-Random Pulsing CDMA Signals

School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
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Author to whom correspondence should be addressed.
Academic Editors: Kamil Krasuski and Damian Wierzbicki
Sensors 2021, 21(12), 4087; https://doi.org/10.3390/s21124087
Received: 12 May 2021 / Revised: 7 June 2021 / Accepted: 7 June 2021 / Published: 14 June 2021
(This article belongs to the Topic GNSS Measurement Technique in Aerial Navigation)
The vector tracking loop (VTL) has high tracking accuracy and a superior ability to track weak signals in GNSS. However, traditional VTL architecture is established on continuous Code Division Multiple Access (CDMA) signal and is incompatible with pseudolite positioning systems (PLPS) because PLPS generally adopts a pseudo-random pulsing CDMA signal structure to mitigate the near-far effect. Therefore, this paper proposes an optimized VTL architecture for pseudo-random pulsing CDMA signals. To avoid estimation biases in PLPS, the proposed VTL adopts irregular update periods (IUP) pre-filters which adjust the update cycles according to the active timeslot intervals. Meanwhile, as the active timeslots of different pseudolites do not overlap, the sampling time of the navigation filter inputs is inconsistent and time-varying, causing jitter degradation. Thus, the proposed VTL predicts the measurements so that they can be sampled at the same time, which improves tracking accuracy. Simulation is carried out to evaluate the performance of the proposed VTL. The results suggest that the proposed VTL outperforms the traditional pre-filter-based VTL and IUP pre-filter-based VTL. View Full-Text
Keywords: pseudo-random pulsing signal; irregular update periods; predicted mesurement; vector tracking loop pseudo-random pulsing signal; irregular update periods; predicted mesurement; vector tracking loop
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MDPI and ACS Style

Tao, L.; Li, G.; Sun, J.; Zhu, B. An Optimized Vector Tracking Architecture for Pseudo-Random Pulsing CDMA Signals. Sensors 2021, 21, 4087. https://doi.org/10.3390/s21124087

AMA Style

Tao L, Li G, Sun J, Zhu B. An Optimized Vector Tracking Architecture for Pseudo-Random Pulsing CDMA Signals. Sensors. 2021; 21(12):4087. https://doi.org/10.3390/s21124087

Chicago/Turabian Style

Tao, Lin, Guangchen Li, Junren Sun, and Bocheng Zhu. 2021. "An Optimized Vector Tracking Architecture for Pseudo-Random Pulsing CDMA Signals" Sensors 21, no. 12: 4087. https://doi.org/10.3390/s21124087

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