吴明魁, 刘万科, 张小红, 田文文. GPS/Galileo/BDS-3试验星短基线紧组合相对定位性能初步评估[J]. 武汉大学学报 ( 信息科学版), 2020, 45(1): 13-20. DOI: 10.13203/j.whugis20180269
引用本文: 吴明魁, 刘万科, 张小红, 田文文. GPS/Galileo/BDS-3试验星短基线紧组合相对定位性能初步评估[J]. 武汉大学学报 ( 信息科学版), 2020, 45(1): 13-20. DOI: 10.13203/j.whugis20180269
WU Mingkui, LIU Wanke, ZHANG Xiaohong, TIAN Wenwen. Initial Assessment of Tightly Combined Relative Positioning for Short Baselines with Observations from GPS, Galileo, and BDS-3 Experimental Satellites[J]. Geomatics and Information Science of Wuhan University, 2020, 45(1): 13-20. DOI: 10.13203/j.whugis20180269
Citation: WU Mingkui, LIU Wanke, ZHANG Xiaohong, TIAN Wenwen. Initial Assessment of Tightly Combined Relative Positioning for Short Baselines with Observations from GPS, Galileo, and BDS-3 Experimental Satellites[J]. Geomatics and Information Science of Wuhan University, 2020, 45(1): 13-20. DOI: 10.13203/j.whugis20180269

GPS/Galileo/BDS-3试验星短基线紧组合相对定位性能初步评估

Initial Assessment of Tightly Combined Relative Positioning for Short Baselines with Observations from GPS, Galileo, and BDS-3 Experimental Satellites

  • 摘要: 北斗全球卫星导航系统(简称北斗三号系统,BDS-3)的试验星播发了与GPS L1/L5、欧洲的伽利略(Galileo)系统E1/E5a/E5b频率重叠的新体制信号B1C/B2a/B2b,这为GPS/Galileo/BDS-3试验星重叠频率的紧组合相对定位提供了条件。首先评估了GPS/Galileo/BDS-3试验星重叠频率差分系统间偏差(differential inter-system bias,DISB)的大小与时域稳定性,结果表明,相同类型接收机的DISB接近于0,在紧组合相对定位中可以忽略其影响。然后初步评估了GPS/Galileo/BDS-3试验星短基线单历元紧组合相对定位性能,结果表明,相较于传统的松组合模型,紧组合模型能够显著提高模糊度固定的成功率与可靠性。尤其是在单系统可观测卫星数较少、仅单频观测值可用的情形下,模糊度固定成功率可提高约25%~45%。

     

    Abstract: The experimental satellites of BeiDou global navigation satellite system (BDS-3) broadcast new B1C/B2a/B2b signals that overlap with GPS L1/L5 signals and European Galileo E1/E5a/E5b signals, which provides the opportunity of tightly combined relative positioning for short baselines with observations from GPS, Galileo, and BDS-3 experimental satellites. In this contribution, we first evaluate the value and time-domain stability of differential inter-system bias (DISB) between overlapping frequencies of GPS, Galileo, and BDS-3. The results show that the DISB of the same type of receiver is close to 0, and its influence can be ignored in the tightly combined relative positioning. Then we preliminarily evaluated performance of single-epoch tightly combined relative positioning for short baselines with observations from GPS, Galileo, and BDS-3 experimental satellites. The results show that, compared with the traditional loosely combined model, the tightly combined model can significantly improve the success rate and reliability of ambiguity resolution. The improvement is especially significant (approximately 25%-45%) under environments where the observed satellites for each system are limited and only single-frequency observations are available.

     

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