LAAS地面系统中多基准一致性检测算法的分析

Analysis of Multiple Reference Consistency Check on LAAS Ground Facility

局域增强系统(L oca l A rea A ugm en ta tion System,LAA S)是美国联邦航空局(F ed era l A v ia tion A d-m in istra tion,FAA)开发的G PS地基增强系统,支持G PS差分精密进近和着陆.多基准一致性检测是LAA S地面完好性监测的核心算法.多基准一致性检测通过对伪距校正误差的测试和评估,保证了LAA S地面系统发布的伪距校正量误差不超出一个给定的范围.本文详细讨论了LAA S完好性监测模型中多基准一致性检测算法的B值的含义,并通过实验分析了B值的范围和阈值的选取.结果表明:在正常无故障情况下,B值的大小稳定在一个较小的范围内变化.一旦发生故障,通过阈值的限制就能检测出B值异常的情况.

The local area augmentation system （LAAS） is the federal aviation administration＇s （FAA＇s） ground-based augmentation system （GBAS） for local area differential GPS （DGPS）. The local area augmentation system ground facility （LGF） is intended to provide performance capable of supporting various precision approach and landing operations. Multiple reference consistency check （MRCC） is the centerpiece of the LAAS integrity monitor on LAAS ground facility. It ensures that the pseudorange correction error do not exceed a given value with testing and estimation of these pseudorange correction errors. The paper discusses the signification of B-values that are the principal output of MRCC. Also, the magnitude of B-values and non-fault level is analyzed by the result of experimentation. It confirms that B-values are small generally, and B-vaules exceed their thresholds with a fault occurred.