ARAIM算法应用于LPV-200服务

Exploration of Advanced RAIM to Provide LPV-200 Service

传统的接收机自主完好性监测(RAIM)技术仅支持LNAV航路,而无法满足有更严格完好性需求的LPV-200进近。近些年来国际上开始兴起的高级RAIM(ARAIM)算法因其垂直导航能力而凸显优势,并且可以通过优化配置危险误导信息概率,进一步降低垂直保护级别(VPL),提高可用性。通过Spirent GSS 8000信号模拟器设置针对LPV-200的场景,利用生成的数据对优化前后的算法进行仿真比较,结果证明双频GPS下的ARAIM技术在局部地区可以达到LPV-200服务的要求。

For LPV-200 approach service, the definition of integrity failure is substantially more stringent than for conventional RAIM schemes that have been used to provide integrity for lateral navigation （LNAV）. Ad- vanced RAIM （ARAIM） algorithm internationally has begun to rise recent years and demonstrated its superior- ity due to the ability of vertical navigation. Moreover, optimized allocation of the probability of hazardous mis- leading information is able to further reduce VPL as well as improve the availability. By using Spirent GSS 8000 satellite navigation simulator to set a scenario for LPV-200 and generate corresponding data, the simula- tion of ARAIM after optimization is compared with that of prior to optimization. The results optimistically indi- cate that it is conceivable to achieve LPV-200 service with the help of dual-frequency GPS in localized areas.