GPS/BDS下ARAIM的可用性验证和卫星的故障检测

ARAIM Availability Verification and Satellite Fault Detection Under the GPS/BDS

基于实测数据,在GPS/BDS下对高级接收机自主完好性监视(ARAIM)的可用性和卫星的故障检测进行了仿真分析。结果表明:GPS/BDS下亚太范围内仅有极小部分区域的垂直保护级(VPL)略大于垂直告警门限(VAL),绝大部分区域的VPL完全满足LPV-200的完好性性能要求,ARAIM的可用性覆盖率达到90%以上;随着卫星出现故障,用户的定位误差明显变大,利用ARAIM算法对卫星的故障进行检测与排除后,用户的定位误差回归正常。验证了ARAIM的可用性,说明了ARAIM算法故障检测的性能良好。

Based on the measured data,the availability of advanced receiver autonomous integrity monitoring(ARAIM)and satellite fault detection under the GPS/BDS are analyzed.The simulation results show that the vertical protection level(VPL)in only a small region is slightly greater than the vertical alert limit(VAL)and the VPL in most region fully meets the integrity performance requirements of LPV-200 under the GPS/BDS in the Asia-Pacific region,and the availability coverage of ARAIM reaches over 90%.With the satellite fault,the user’s positioning error becomes significantly larger.After using the ARAIM algorithm to detect and eliminate the satellite fault,the user’s positioning error returns to normal.The above results verify the availability of ARAIM and show that the performance of ARAIM algorithm fault detection is good.