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随着全球导航卫星系统技术的发展，广播星历精度逐渐提升，为基于广播星历实现的精密单点定位（precise point position with broadcast ephemerides, BE-PPP）带来了希望。本文基于2022年6月至2023年11月的BDS-3广播星历分析了其误差特性，并基于此改正相应误差实现BDS-3 BE-PPP。根据实验结果，本文首次发现BDS-3广播和精密轨道间的赫尔默特旋转参数在2023年8月逐渐减小，这也改善了赫尔默特七参数的根和平方（root-sum-square,RSS）。2023年9月、10月和11月的RSS平均值分别为5.16 cm、5.51 cm和5.12 cm，明显优于其余月份。通过修正BDS-3广播轨道Z向年周期平移误差和引入广播星历视线方向综合误差参数进行BE-PPP数据处理，2月的静态和仿动态的三维定位精度分别为32.6 cm和52.5 cm;11月使用精度提升的BDS-3广播星历的静态和仿动态的三维定位精度分别为26.6cm和43.5cm，相比2月，分别提升了18.4%和15.5%。
Abstract：With the development of GNSS technology, broadcast ephemeris accuracy has been gradually improved, which brings hope for precise point positioning with broadcast ephemeris(BE-PPP). In this study, we analyzed the error characteristics of BDS-3 broadcast ephemeris from June 2022to November 2023, and correct the corresponding errors to achieve the BDS-3 BE-PPP based on this. The Helmert rotation parameters between BDS-3 broadcast and precision orbits gradually decreasing from August 2023 is first found, which also improves the root-sum-square(RSS) of the Helmert seven parameters. The average RSS for September, October and November 2023 are 5. 16, 5. 51 and 5. 12 cm, respectively, which are significantly better than those of other months.By correcting the BDS-3 broadcast orbit Z-translation error and introducing broadcast ephemeris synthesis error parameter at line-of-sight direction for BE-PPP processing, the three-dimensional(3D) positioning accuracies in February are 32. 6and 52. 5 cm for static and simulated kinematic solution, respectively. The 3D positioning accuracies in November are 26. 6 and 43. 5 cm for static and simulated kinematic solution with the improved BDS-3 broadcast ephemeris, respectively, which are improve by 18. 4% and 15. 5% compared to those of February.
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基本信息:
DOI：10.14188/j.2095-6045.20240141
中图分类号:TN967.1;P228
引用信息:
[1]刘建辉,叶世榕,夏凤雨等.采用BDS-3广播星历的精密单点定位[J].测绘地理信息,2025,50(04):22-27.DOI:10.14188/j.2095-6045.20240141.
基金信息:
中交公规院科技创新专项（C22030A）; 福建省高新技术与工业科技引导性资助项目（2022H0030）; 上海市科技计划项目（23YF1455500）; 中国博士后面上基金（2023M743653）