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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Characteristics of BDS Signal-in-Space User Ranging Errors and Their Effect on Advanced Receiver Autonomous Integrity Monitoring Performance
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Characteristics of BDS Signal-in-Space User Ranging Errors and Their Effect on Advanced Receiver Autonomous Integrity Monitoring Performance

机译：BDS空间信号用户测距误差的特征及其对高级接收机自主完整性监控性能的影响

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Signal-In-Space User Range Errors (SIS UREs) are assumed to be overbounded by a normal distribution with a standard deviation represented by the User Range Accuracy (URA). The BeiDou Navigation Satellite System (BDS) broadcast URA is not compatible with the historical SIS URE performance that affects the Advanced Receiver Autonomous Integrity Monitoring (ARAIM) False Alert Probability (Pfa) and availability evaluation. This study compares the BDS broadcast and precise ephemeris from 1 March 2013 to 1 March 2017 to obtain SIS UREs. Through analyzing the statistical characteristics of the SIS UREs, we obtain the standard deviation σURE for the accuracy and continuity and σURA used for the integrity of the SIS UREs. The results show that the broadcast σURA of 2 m cannot completely overbound SIS UREs for all BDS satellites, but the σURA of 2.4 m can. Then, we use the σURA of 2.4 m to evaluate the ARAIM Pfa and availability. The results show that the Pfa may increase to 2 × 10−5 and exceed its limit by an order of magnitude. We also consider the differences between the SIS UREs of Geostationary Earth Orbit (GEO), Inclined Geo-Synchronous Orbit (IGSO), and Medium Earth Orbit (MEO). The results indicate that all Pfa values calculated by the computed σURE are less than the Pfa in the Integrity Support Message (ISM) for the worst-performing GEO satellite. The approximately 55% Pfa calculated by the computed σURE is less than the Pfa in ISM for the worst-performing IGSO satellite. Most Pfa values calculated by the computed σURE is less than the Pfa in the ISM for the worst-performing MEO satellite. For BDS satellites, the Pfa is mainly affected by σURE. When the σURA of 2.4 m is used to evaluate the availability, the computed availability is lower than the availability calculated by the broadcast σURA/σURE and the greatest degradation can reach 25%.
机译：假定空间信号用户范围误差（SIS URE）被正态分布所覆盖，且标准偏差由用户范围精度（URA）表示。北斗导航卫星系统（BDS）广播的URA与历史SIS URE性能不兼容，SIS URE性能影响高级接收器自主完整性监控（ARAIM）虚警概率（Pfa）和可用性评估。本研究比较了2013年3月1日至2017年3月1日的BDS广播和精确星历，以获取SIS URE。通过分析SIS URE的统计特征，我们获得了标准偏差σURE的准确性和连续性，以及σURA表示SIS URE的完整性。结果表明，广播的2 m的σURA不能完全覆盖所有BDS卫星的SIS URE，而2.4 m的σURA可以。然后，我们使用2.4 m的σURA来评估ARAIM Pfa和可用性。结果表明，Pfa可能增加到2×10 −5 ，并超出其极限一个数量级。我们还考虑了地球静止轨道（GEO），倾斜地球同步轨道（IGSO）和中地球轨道（MEO）的SIS URE之间的差异。结果表明，对于性能最差的GEO卫星，由计算出的σURE计算的所有Pfa值都小于完整性支持消息（ISM）中的Pfa。对于性能最差的IGSO卫星，通过计算的σURE计算得出的Pfa约为55％，小于ISM中的Pfa。对于性能最差的MEO卫星，通过计算的σURE计算出的大多数Pfa值都小于ISM中的Pfa。对于BDS卫星，Pfa主要受σURE影响。当使用2.4 m的σURA评估可用性时，计算出的可用性低于广播σURA/σURE计算出的可用性，最大降级可以达到25％。

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