Proceedings Article10.1109/itaic54216.2022.9836659
A Graph Optimization Method for GNSS Signal Tracking Loop
17 Jun 2022
TL;DR: In this article , a Graph Optimization (GO) method based carrier tracking errors mitigation method was proposed, which utilized the inherent relationship between the tracking errors in time domain, and the phase tracking errors decreased by xx.
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Abstract: Global Navigation Satellite System (GNSS) constructed based satellites in space has been extended in almost everywhere in our daily life for providing precise position, velocity and time (PVT) information. GNSS receivers process the signals and generate measurements for calculating the PVT information. Signal tracking in a GNSS receiver is composed of carrier and code tracking, and pseudo-range and pseudo range rates are generated individually from the two tracking loops. A Frequency Lock Loop (FLL) and Phase Lock Loop (PLL) are common methods for carrier tracking and code tracking respectively. Kalman Filter was employed to mitigate the carrier tracking errors with the carrier phase dynamic model. Therefore, the PLL could work with a wider bandwidth to tolerate higher dynamics or weak signals. In this paper, we proposed a Graph Optimization (GO) method based carrier tracking errors mitigation method, GO method utilized the inherent relationship between the tracking errors in time domain. With a GPS L1 dataset collected in real environment, the KF and GO were compared, and the phase tracking errors decreased by xx, which supported the conclusion that GO was superior than KF in mitigating the carrier tracking errors.
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References
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TL;DR: This second edition of Dr. Grove's book is an excellent reference (with numerous nuggets of wisdom) that should be readily handy on the shelf of every practicing navigation engineer and will also serve students as a great textbook.
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Carrier Phase Tracking of Weak Signals Using Different Receiver Architectures
Mark G. Petovello,Cillian O'Driscoll,Gérard Lachapelle +2 more
- 30 Jan 2008
TL;DR: This paper investigates four receiver architectures and their ability to track the carrier phase signal under attenuated environments and finds the ultra-tight receiver performed best, the estimator-based receiver performed second best and the standard receiver performed the worst.
51
An Acquisition Algorithm Based on FRFT for Weak GNSS Signals in A Dynamic Environment
Yiran Luo,Lei Zhang,Hang Ruan +2 more
TL;DR: To improve the acquisition sensitivity of the weak and dynamic global navigation satellite systems signal, the fractional Fourier transform (FRFT) is introduced to deal with the acquisition process.
42
A Novel Adaptive Digital Phase-Lock-Loop for Modern Digital GNSS Receivers
TL;DR: A Kalman filtering method with an adaptive scheme to adjust the noise statics is employed to change the equivalent noise bandwidth by using empirical knowledge of the signal-to-noise ratio and the signal dynamics in response to the faded signals and the user dynamics.
41
Errata: Digital GNSS PLL design conditioned on thermal and oscillator phase noise
TL;DR: Design rules are developed for optimal, Wiener filter based PLLs conditioned on the influence of the oscillator and thermal noise on consumer-grade receivers that are examined through both simulation and the use of actual GPS signals.
36
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