Receiver pseudorange biases of BDS-3 satellite navigation signal: modeling and validation

• Main Authors: MAO Feiyu, GONG Xiaopeng, GU Shengfeng, WANG Chenchen, LOU Yidong
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2021-04-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: bds-3; pseudorange bias; inhomogeneous receivers; dcb estimation
• Online Access: http://xb.sinomaps.com/article/2021/1001-1595/2021-4-457.htm

Receiver pseudorange biases are systematic pseudorange biases caused by non-ideal satellite navigation signals among different bandwidths and correlator spaces. Studies indicate that BDS-2, GPS and Galileo are all influenced by receiver-related pseudorange biases, which will affect the precise data processing among inhomogeneous receivers. In this paper, we use three observation combinations, including Melbourne-Wübbena (MW), ionosphere-free (IF) and pseudorange ionosphere- and geometry-free (IFGF) combinations, to analyze the characteristics of BDS-3 pseudorange biases based on International GNSS Monitoring and Assessment System (iGMAS) and Multi-GNSS EXperiment (MGEX) observations. The results show that there are receiver-related pseudorange biases for BDS-3 and the IF combination biases can reach up to 6 ns. According to the characteristics of BDS-3 pseudorange biases, eight groups of corrections are estimated and validated by differential code bias (DCB) estimation and single-frequency single point positioning (SF-SPP). The results indicate that the consistency of BDS-3 satellite DCB estimated by different receiver groups can be significantly improved when corrections are used. For example, the difference of C2I-C6I、 C1P-C5P and C2I-C7D DCB estimated by iGMAS and MGEX receivers decrease by 91.6%、64.7% and 71.9%, respectively. Moreover, after correcting the pseudorange bias, the accuracy of SF-SPP are improved by 13.9% and 11.0% in vertical and horizontal components, respectively.