Ephemeris type a fault analysis and mitigation for LAAS
Ephemeris type a fault analysis and mitigation for LAAS
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DOI：
10.1109/plans.2010.5507218
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发表时间：
2010-05
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影响因子：
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通讯作者：
Haochen Tang;S. Pullen;P. Enge;L. Gratton;B. Pervan;M. Brenner;Joe Scheitlin;P. Kline
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作者：
Haochen Tang;S. Pullen;P. Enge;L. Gratton;B. Pervan;M. Brenner;Joe Scheitlin;P. Kline
美国联邦航空局（FAA）开发了局域增强系统（LAAS），以使用全球定位系统（GPS）实现精确进近和着陆操作。每个LAAS装置通过位于其服务的机场的LAAS地面设施（LGF）提供服务。通过监测全球定位系统信号、测量和导航信息，LGF能够排除不正常的卫星，并通过VHF数据链路向用户广播正常卫星的实时距离校正信息。机载用户应用这些修正来消除LGF和飞机之间常见的误差。LGF还负责警告飞机任何潜在的完整性威胁，这些威胁无法通过排除不健康的卫星来轻松解决。潜在误差的一个来源是卫星广播星历表信息，用户将其解码并用于计算GPS卫星位置。在LAAS中，根据故障是否与卫星机动相关，将潜在的GPS星历故障分为两种类型，A和B。这项工作的重点是A型故障造成的航空导航威胁。为了检测和减轻这些威胁，我们调查两个LGF监视器的基础上比较预期的范围和范围速率（基于广播星历）与LGF测量。本文对这些监测器的有效性进行了分析和验证。
The Local Area Augmentation System (LAAS) has been developed by the FAA to enable precision approach and landing operations using the Global Positioning System (GPS). Each LAAS installation provides services through a LAAS Ground Facility (LGF) which is located at the airport it serves. By monitoring the GPS signals, measurements, and navigation messages, the LGF is able to exclude unhealthy satellites and broadcast real-time range-correction messages for healthy satellites to users via a VHF data link. Airborne users apply these corrections to remove errors that are common between the LGF and the aircraft. The LGF is also responsible for warning the aircraft of any potential integrity threats that cannot easily be resolved by excluding unhealthy satellites. One source of potential errors is the satellite broadcast ephemeris message, which users decode and use to compute GPS satellite positions. In LAAS, potential GPS ephemeris faults are categorized into two types, A and B, based upon whether or not the fault is associated with a satellite maneuver. This work focuses on aviation navigation threats caused by Type A faults. To detect and mitigate these threats, we investigate two LGF monitors based on comparing expected ranges and range rates (based on broadcast ephemeris) with those measured by the LGF. The effectiveness of these monitors is analyzed and verified in this paper.