| 摘要: |
| 针对传统伪距单点定位（ＳＰＰ）算法因采用固定单频或双频组合定位函数模型，在信号丢失时无法充分利用所有频点观测量，导致定位性能下降甚至无法进行定位解算的问题，提出了一种基于北斗三号卫星导航系统（BDS-3）全频点的自适应ＳＰＰ算法。该方法通过对BDS-3所有单频及多频组合模式的定位性能进行分析，确定出所有定位函数模型的优先级。在进行实时定位解算时，根据接收到的伪距频点信号和事先确定的定位函数模型优先级，选取最高优先级的定位函数模型进行ＳＰＰ解算。采用全球25个MGEX测站的观测数据以及中国科学院（CAS）发布的DCB产品，对BDS-3的5个公开服务信号进行了测试。测试结果表明，BDS-3 B1I/B1C/B2a三频组合的定位性能最优，随后依次为B1I/B3I/B1C/B2a，B1I/B2b/B3I/B1C/B2a，B1I/B2b/B1C/B2a等。相较于B1I/B1C/B2a最优的三频组合，自适应ＳＰＰ算法在复杂条件下能够显著改善定位的连续性，同时与其他定位模型相比具有更优的定位性能。 |
| 关键词: 北斗三号卫星导航系统 全频点自适应 无电离层组合 伪距单点定位 |
| DOI： |
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| 基金项目:国家自然科学青年基金项目（62203216）；国家自然科学基金民航联合基金重点项目（U2233215）;江苏省自然科学青年基金项目（BK20220886） |
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| BDS-3 full-frequency adaptive pseudo-range single point positioning algorithm |
| ZHANG Qieqie,TIAN Xiaojie,FANG Le,LAI Jizhou |
| (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) |
| Abstract: |
| To address the issue that the conventional pseudo-range single point positioning（SPP） algorithms, which use fixed single-frequency or multi-frequency combination positioning function models, cannot fully utilize all available frequency measurements when signal loss occurs, leading to degraded positioning performance or even an inability to compute a positioning solution, a BDS-3 full-frequency adaptive pseudo-range SPP algorithm is proposed. This method involves a comprehensive analysis of the positioning performance across all frequencies and their combinations for BDS-3. And the analysis is used to establish the priority ranking of all positioning function models. For real-time positioning solution, the positioning function model with the highest priority is selected for the pseudo-range SPP solution, based on the received pseudo-range frequency signals and the predefined priority rankings. Observation data from 25 global MGEX stations and DCB products released by the Chinese Academy of Sciences (CAS) are employed to test five publicly available service signals of BDS-3. The experimental results show that the triple-frequency combination of B1I/B1C/B2a exhibits optimal positioning performance, followed sequentially by the combinations B1I/B3I/B1C/B2a, B1I/B2b/B3I/B1C/B2a, and B1I/B2b/B1C/B2a. Notably, the adaptive pseudo-range SPP algorithm significantly enhances positioning continuity under complex operational conditions compared to the B1I/B1C/B2a triple-frequency combination, while maintaining superior positioning performance compared to other positioning models. |
| Key words: BeiDou-3 navigation satellite system(BDS-3) Full-frequency adaptation Ionosphere-free combination Pseudo-range single point positioning |
