Characterizing BDS signal‐in‐space performance from integrity perspective
Characterizing BDS signal‐in‐space performance from integrity perspective
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DOI：
10.1002/navi.409
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发表时间：
2021-01
影响因子：
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通讯作者：
Shizhuang Wang;Y. Zhai;X. Zhan
中科院分区：
文献类型：
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作者：
Shizhuang Wang;Y. Zhai;X. Zhan
中国北斗导航卫星系统（BDS）的全面部署已于2020年6月完成。为了支持安全关键型应用，系统必须提供有保证的空间信号（SIS）性能。作为BDS的关键步骤之一，本文从完整性的角度描述了区域（BDS-2）和全球（BDS-3）系统的SIS距离误差（SISRE）。根据航空安全标准，提出了一种数据驱动的SISRE评估方案。该方案通过评估超界用户范围精度（URA）和先验故障概率，分别捕获正常和异常SIS行为。通过对BDS-2从2016年开始的4.5年星历和BDS-3从2019年开始的近1.5年数据的处理，我们初步提供了BDS SIS特征的整体图像，并揭示了不同卫星之间的显著性能差异。
The full deployment of China’s BeiDou navigation satellite system (BDS) was finalized in June 2020. To support safety-critical applications, the system must provide assured signal-in-space (SIS) performance. As one of the key steps forward for BDS, this paper characterizes the SIS range errors (SISREs) for both the regional (BDS-2) and the global (BDS-3) systems from the integrity perspective. Following the safety standards in aviation, a data-driven SISRE evaluation scheme is presented in this work. This scheme evaluates the overbounding user range accuracy (URA) and the prior fault probability to respectively capture the nominal and anomalous SIS behaviors. By processing the 4.5-year ephemerides starting from 2016 for BDS-2 and the recent 1.5-year data from2019 for BDS-3, we preliminarily provide an overall picture of the BDS SIS characteristics and reveal the significant performance variation among different satellites.