Ephemeris type a fault analysis and mitigation for LAAS

Haochen Tang, S. Pullen, P. Enge, L. Gratton, B. Pervan, M. Brenner, Joe Scheitlin, P. Kline
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引用次数: 17

Abstract

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.
星历类型为LAAS的故障分析和缓解
美国联邦航空局开发了局部区域增强系统(LAAS),利用全球定位系统(GPS)实现精确进近和着陆操作。每个LAAS装置通过位于其服务机场的LAAS地面设施(LGF)提供服务。通过监测GPS信号、测量和导航信息,LGF能够排除不健康的卫星,并通过甚高频数据链向用户广播健康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和飞机之间常见的错误。LGF还负责警告飞机任何潜在的完整性威胁,这些威胁不能通过排除不健康的卫星来轻易解决。潜在错误的一个来源是卫星广播星历信息,用户解码并使用它来计算GPS卫星位置。在LAAS中,基于故障是否与卫星机动相关,潜在的GPS星历故障分为A和B两类。本文主要研究A类故障对航空导航造成的威胁。为了检测和减轻这些威胁,我们研究了两个LGF监视器,将预期范围和距离速率(基于广播星历)与LGF测量的范围和距离速率进行比较。本文对这些监测仪的有效性进行了分析和验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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