BDS-3/GNSS multi-frequency precise point positioning ambiguity resolution using observable-specific signal bias. (31st May 2022)

• Record Type: Journal Article
• Authors: Cao, Xinyun; Yu, Xuesheng; Ge, Yulong; Liu, Tianjun; Shen, Fei
• Is Part Of: Measurement. Volume 195(2022)
• Publication Date: 2022-05-31
• Subjects: BDS-3 -- Multi-frequency and multi-system -- Precise point positioning -- Ambiguity resolution -- Observable-specific signal bias; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2022.111134
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Observable-specific signal bias (OSBs) transformation for multi-frequency is deduced. Inter-frequency clock bias and antenna phase center must be consistent with OSBs. Quad-frequency is conductive to shorten the convergence time of BDS-3 kinematic PPP. Quad-system multi-frequency PPP-AR achieve millimeter-level in horizontal direction. Abstract: With the completion of the BeiDou Global Navigation Satellite System (BDS-3), more available frequencies have brought opportunities for precise point positioning ambiguity resolution (PPP-AR). This research theoretically deduced the multi-frequency PPP-AR model and the rule of observable-specific signal bias (OSBs) transformation. Then 34 International GNSS Service stations were selected to investigate the multi-frequency BDS-3 and multi-GNSS PPP-AR. The results suggested that the OSBs products provided by Centre National D'Etudes Spatiales (CNES) have absorbed the impact of inter-frequency clock bias and could be directly added to the original observations to restore the integer characteristics of the multi-frequency ambiguity. Meanwhile, the antenna phase center correction should keep consistent when using the CNES OSBs to restore the Melbourne-Wübbena ambiguity. The BDS-3 quad-frequency ambiguity-fixed convergence time was 39.0 and 25.1 min for kinematic and static PPP, which was shortened by nearly 15.0 and 3.4 min than the dual-frequency ambiguity-fixed solution. The quad-system multi-frequency PPP-AR showed the optimal state, which was 0.66, 0.76 and 2.66 cm for kinematic mode while 0.31, 0.31 and 1.02 cm for static mode in east, north, and up directions, respectively.