DGNSS Corrected Pseudorange and Time-Differenced Carrier Phase (TDCP) Measurements using Differentiable Factor Graph Optimization (DFGO)

Hoi-Fung Ng, Penghui Xu, Yihan Zhong, Guohao Zhang, Weisong Wen, and Li-Ta Hsu

Peer Reviewed

Abstract: Google Smartphone Decimeter Challenge (SDC) provides a dataset for the communities to verify their leading-edge algorithm for precise smartphone GNSS positioning under the same baseline. This year’s dataset provides more variety on the vendors of smartphones’ GNSS chips, where the new data from affordable smartphones is believed to be noisier, increasing the position uncertainty. This study integrates the pseudorange, time-differenced carrier phase (TDCP) measurements, and estimated velocity using factor graph optimization (FGO) to provide an optimal and robust position estimation. In the optimization process, properly excluding and weighting the measurement is the key for only using healthy measurements for state estimation. This study also uses the differentiable FGO (DFGO) to determine the covariance for the GNSS positioning adaptively. The positioning results show that the network can provide a more robust and reliable performance than the traditional model-based approach.
Published in: Proceedings of the 37th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2024)
September 16 - 20, 2024
Hilton Baltimore Inner Harbor
Baltimore, Maryland
Pages: 2667 - 2675
Cite this article: Ng, Hoi-Fung, Xu, Penghui, Zhong, Yihan, Zhang, Guohao, Wen, Weisong, Hsu, Li-Ta, "DGNSS Corrected Pseudorange and Time-Differenced Carrier Phase (TDCP) Measurements using Differentiable Factor Graph Optimization (DFGO)," Proceedings of the 37th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2024), Baltimore, Maryland, September 2024, pp. 2667-2675. https://doi.org/10.33012/2024.19908
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