Journal Article10.1109/TCSII.2020.3025455
GNSS Vector Tracking Method Using Graph Optimization
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TL;DR: A graph optimization (GO) method is employed to substitute the KF to estimate the navigation solutions in VT, which is expected to alleviate the influence of the measurement model nonlinearity on the state estimation.
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Abstract: Commonly, there are two different types of signal tracking methods in Global Navigation Satellite System (GNSS) receivers: Scalar Tracking (ST) and Vector Tracking (VT). In ST, each tracking channel works independently and generates the measurements for Position, Velocity and Time (PVT) estimation. On the contrary, VT accomplishes the signal tracking and PVT solutions estimation together using a Kalman filter (KF). In this manner, mutual aiding between these channels are obtained, which contributes to the superior performance of VT than ST. KF is the method in the manner of weighted average of predicted state and the measurements derived state. Two drawbacks restrict the KF performance, (1) in KF, correlation between current state and all the past states is ignored, only adjacent state is included in the current state estimation through state transformation matrix; (2) linear KF might degrade the estimation due to the nonlinearity of the VT measurement model. In this brief, a graph optimization (GO) method is employed to substitute the KF to estimate the navigation solutions in VT. In the GO-VT, the measurements and the state transformation from past epochs are all regarded as constraints to optimize the states estimation. With the iterations during the optimization, the GO-VT is expected to alleviate the influence of the measurement model nonlinearity on the state estimation. A field test was carried out for assessing the performance of the GO-VT, its superior position accuracy compared with that from the KF supported that the GO could enhance the VT.
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Citations
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TL;DR: In this article, a joint vector tracking loop based on the linear model was proposed to track codes and carriers jointly regardless of whether the RF module and the digital processing module are driven by the same clock or not.
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TL;DR: Test results show that the vector tracking loops have definite advantages over traditional scalar loops including better position accuracy and higher robustness under low signal-to-noise ratios, however, to obtain these benefits, the vector loop parameters should be carefully tuned depending on different scenarios the receiver is going through.
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