Research on the Impact of BDS-2/3 Receiver ISB on LEO Satellite POD

• Published in: Remote sensing (Basel, Switzerland) Vol. 14; no. 11; p. 2514
• Main Authors: Zhao, Xinglong, Zhou, Shanshi, Cao, Jianfeng, Yuan, Junjun, Wu, Ziqian, Hu, Xiaogong
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 24.05.2022
• Subjects: BDS-2/3-based POD; BeiDou Navigation Satellite System; Bias; Data processing; Earth orbits; Global navigation satellite system; Global positioning systems; GPS; GPS and BDS joint POD; intersystem bias; Investigations; Ionosphere; low Earth orbit; Low earth orbit satellites; Low earth orbits; Navigation satellites; Orbit determination; precise orbit determination; Remote sensing; Satellite navigation systems; Satellite orbits; Satellites
• ISSN: 2072-4292; 2072-4292
• DOI: 10.3390/rs14112514

In recent years, the multi-GNSS positioning application is becoming more and more popular, same to the low Earth orbit (LEO) satellite precise orbit determination (POD) based on the onboard multi-GNSS measurements. The third-generation Beidou navigation satellite system (BDS-3) provides a new option to obtain the LEO satellite orbit solutions. However, the receiver intersystem bias (ISB) of different GNSS is unavoidable in multi-GNSS data processing. This paper’s main goal is absorption of the impact of the ISB between BDS-3 and BDS-2 on the LEO satellite POD. Taking GPS-based POD solutions for the reference orbit, this paper evaluates the orbit accuracy of BDS-2-based POD, BDS-3-based POD, BDS-2 and BDS-3 combined PODs with/without ISB. The BDS-3-based POD accuracy is 6.57 cm in the 3D direction, a 56% improvement over BDS-2-based POD. When the ISB between BDS-3 and BDS-2 is estimated, the BDS-2/3 combined POD accuracy of 5.37 cm in the 3D direction is better than that without ISB, which is a 64% improvement over BDS-2-based POD and 18% improvement over BDS-3-based POD. For GPS and BDS-2/3 combined POD, the GPS and BDS-3 joint POD solutions have the smallest RMS differences in overlapping consistency and smallest RMS differences compared to GPS-based POD. This study indicates that estimating the BDS-2/3 receiver ISB in BDS-2/3 joint POD could improve the orbit accuracy, and the GPS and BDS-3 joint POD solution is better than another combined POD. This paper will provide meaningful references for the LEO satellite multi-GNSS-based POD.