BDS-3系统完好性SISA参数等级转换算法优化

姜娜娜, 张守建, 曹月玲, 李星星, 夏凤雨, 孟轶男, 陈雷

姜娜娜, 张守建, 曹月玲, 李星星, 夏凤雨, 孟轶男, 陈雷. BDS-3系统完好性SISA参数等级转换算法优化[J]. 武汉大学学报 ( 信息科学版). DOI: 10.13203/j.whugis20240331
引用本文: 姜娜娜, 张守建, 曹月玲, 李星星, 夏凤雨, 孟轶男, 陈雷. BDS-3系统完好性SISA参数等级转换算法优化[J]. 武汉大学学报 ( 信息科学版). DOI: 10.13203/j.whugis20240331
JIANG Nana, ZHANG Shoujian, CAO Yueling, LI Xingxing, XIA Fengyu, MENG Yinan, CHEN Lei. Optimization of SISA parameter level conversion algorithm for BDS- 3 system integrity[J]. Geomatics and Information Science of Wuhan University. DOI: 10.13203/j.whugis20240331
Citation: JIANG Nana, ZHANG Shoujian, CAO Yueling, LI Xingxing, XIA Fengyu, MENG Yinan, CHEN Lei. Optimization of SISA parameter level conversion algorithm for BDS- 3 system integrity[J]. Geomatics and Information Science of Wuhan University. DOI: 10.13203/j.whugis20240331

BDS-3系统完好性SISA参数等级转换算法优化

基金项目: 

国家自然科学基金(42374016,12373077,12303071,42474023)。

详细信息
    作者简介:

    姜娜娜,博士,研究方向为GNSS定位及完好性。2024182140078@whu.edu.cn

    通讯作者:

    张守建,博士,副教授。shjzhang@sgg.whu.edu.cn

Optimization of SISA parameter level conversion algorithm for BDS- 3 system integrity

  • 摘要: 卫星导航系统的服务完好性SISA参数由广播星历中播发的完好性索引指数通过相应的转换算法计算得到,用于星历空间测距误差及定位服务精度的预测。基于实测数据,评估了BDS-3系统完好性SISA参数对空间测距误差的包络能力。结果表明完好性SISAoc参数对轨道径向与钟差的综合测距误差存在漏包络现象。为了解决这一问题,基于395天历史数据,提出一种改进的SISA参数索引转换算法。该算法包括两部分: SISAocb取值优化和SISAoc1算法优化。在SISAocb取值优化中,取历史所有卫星轨道径向误差与钟差误差RMS值之和的最大数作为SISAocb的最小限值。在SISAoc1算法优化中,通过钟差拟合提取的一次项系数最值与自变量自由取值公式计算的SISAoc1相比,确定SISAoc1参数计算公式中的常数N值。通过对8个月的实测数据进行分析,验证了所建算法的优势,实现了SISAoc参数对卫星沿径向误差的“零次”漏包络(不包含卫星在境外时广播星历显著异常情况),降低了因电文参数播发值不合理带来的BDS-3系统完好性参数漏包络事件。
    Abstract: Objectives: To improve the leakage envelope phenomenon of BDS-3 SISAoc integrity parameter to the comprehensive ranging errors induced by the orbit radial and clock errors, an improved SISA parameter index conversion algorithm based on 395 days of historical data is proposed. Methods: The algorithm consists of two parts: SISAocb (SISA parameter associated with orbit radial and clock accuracy) and SISAoc1 (SISA parameter associated with satellite clock speed accuracy) algorithm optimization. In SISAocb value optimization, the RMS maximum of orbits radial and clock comprehensive error of all satellites in history is taken as the minimum limit of SISAocb. In the optimization of SISAoc1 algorithm, the maximum of first-order coefficient extracted through clock error fitting is compared with SISAoc1 calculated by free value formula of independent variable to determine the constant N in the SISAoc1 parameter calculation formula. Results: By analyzing measured data of 8 months, the advantages of the proposed algorithm are verified. The new algorithm can achieve the “zero” leakage envelope of SISAoc parameter for satellite radial and clock errors (excluding significant anomalies in broadcast ephemeris for satellite abroad), and reduced the leakage envelope event of BDS-3 integrity parameter caused by unreasonable SISA broadcast values. Conclusions: The effective optimization algorithm and analysis results for BDS- 3 SISAoc parameter in this paper can provide a valuable reference for the upgrading and construction of BDS-3 system integrity service.
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出版历程
  • 收稿日期:  2024-12-21

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