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Open AccessArticle

Assessment of Different Stochastic Models for Inter-System Bias between GPS and BDS

by Nan Jiang 1,2,3, Tianhe Xu 1,4, Yan Xu 1,4,*, Guochang Xu 1 and Harald Schuh 2,3
1
Institute of Space Sciences, Shandong University, Weihai 264209, China
2
Institut für Geodäsie und Geoinformationstechnik, Technical University of Berlin, 10623 Berlin, Germany
3
German Research Centre for Geosciences GFZ, Telegrafenberg, 14473 Potsdam, Germany
4
State Key Laboratory of Geo-Information Engineering, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(8), 989; https://doi.org/10.3390/rs11080989
Received: 15 March 2019 / Revised: 19 April 2019 / Accepted: 23 April 2019 / Published: 25 April 2019
(This article belongs to the Special Issue Global Navigation Satellite Systems for Earth Observing System)
Inter-system bias (ISB) will affect accuracy and processing time in integrated precise point positioning (PPP), and ISB stochastic models will largely determine the quality of ISB estimation. Thus, the impacts of four different stochastic models of ISB processing will be assessed and studied in detail to further reveal the influence of ISB in positioning. They are ISB-PW considering ISB as a piece-wise constant, ISB-RW considering ISB as random walk, ISB-AD considering ISB as an arc-dependent constant, and ISB-WN considering ISB as white noise. Together with the model without introducing ISB called ISB-OFF, i.e., five different schemes, ISB-OFF, ISB-PW, ISB-RW, ISB-AD, and ISB-WN, will be designed and tested in this study. From the results of pseudorange residuals, it can be noticed that when considering ISB, the Root-Mean-Square (RMS) of ionosphere-free combined pseudorange residuals are much smaller than without ISB (ISB-OFF). The results of convergence time and positioning accuracy analysis show that PPP performance with ISB-AD is even worse than ISB-OFF, when using the precise products from the German Research Centre for Geosciences (GFZ) named as GBM products here; while the strategies of ISB-RW, and ISB-WN achieve the best results. For the products from Wuhan University called WUM products, a completely different result is achieved. PPP with the stochastic models of ISB-PW and ISB-AD perform best. The most likely reason is the ISB stochastic models applied by the analysis centers are consistent with those used in the PPP on the user side. So, ISB-RW, or ISB-WN is recommended when GBM products are used, and for the WUM products, ISB-PW, or ISB-AD is chosen. From the statistics of PPP precision during the convergence period, it can be concluded that considering ISB also has a great improvement on combined PPP accuracy during the initialization phase. View Full-Text
Keywords: inter-system bias; stochastic model; piece-wise; random walk; white noise inter-system bias; stochastic model; piece-wise; random walk; white noise
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MDPI and ACS Style

Jiang, N.; Xu, T.; Xu, Y.; Xu, G.; Schuh, H. Assessment of Different Stochastic Models for Inter-System Bias between GPS and BDS. Remote Sens. 2019, 11, 989.

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