LAAS地面系统差分处理算法分析

为改善区域内导航服务性能，支持 GPS 差分精密进近和着陆，美国联邦航空局 (Federal Aviation Administration，FAA)提出了局域增强系统(Local Area Augmentation System， LAAS)。差分处理主要对接收数据进行载波平滑，产生伪距校正信息等。本文详细讨论了 LAAS 地面系统(LAAS Ground Facility，LGF)差分处理流程及算法，并且对处理后的仿真数据计算 B 值， 并进行信息域范围测试(Message Field Range Test，MFRT)计算。结果表明：差分处理后的接收机数据，能够为完好性监测算法提供数据源，经 MFRT 验证，差分处理结果是有效的。

Analysis of Differential Processing on LAAS Ground Facility

In order to improve the performance of the navigation service and support Differential GPS precision approach and landing at airports, the US Federal Aviation Administration (FAA) developed the Local Area Augmentation System (LAAS). Differential processing means a variety of algorithms, including carrier smoothing pseudo range and the calculation of differential corrections etc. This paper gives a detailed discussion of the processes and algorithms of LAAS ground facility (LGF), calculate the B value and a Message Field Range Test (MFRT) calculation against the simulated data. It confirms that the differential processing can provide effective data for integrity monitor algorithms, and the results of the MFRT processing are available.