摘要
讨论了如何提高单星座增强型接收机自主完好性监测ARAIM算法的可用性问题。借助于钟差辅助模型设计了一种能够用于垂直精密进近LPV-250服务的单星座ARAIM算法。将钟差预测值作为虚拟伪距观测值纳入到当前的定位解算中,以提高单星座ARAIM算法的可用性。设计了新的完好性风险配置方案,在计算用户保护水平时,通过直接计算故障偏差对定位误差的影响大小来解决未知故障偏差的估计问题,对于系统的可用性给出了更精确的评定。试验分析结果表明,钟差辅助对于提高单星座ARAIM算法的可用性具有显著的作用。
The problem of improving the availability of single constellation ARAIM algorithm was discussed in this paper. A new clock-aided single constellation ARAIM algorithm was given, which could be used in the LPV-250 guidance. The predictions of clock offsets that are considered as virtual pseudo-ranges is taken into the positioning so as to improve the availability the single constellation ARAIM algorithm. A new allocation method for integrity risk of ARAIM was designed. The magnitudes of positioning biases caused by the satellite faults were computed directly to solve the problem of the unknown magnitudes of faults, which proposes a more accurate evaluation for the system availability. Examples were illustrated by the observations from the simulated BDS, which proofed that the clock-aided methods could improve the availability of single constellation ARAIM significantly.
出处
《测绘科学技术学报》
CSCD
北大核心
2015年第5期455-459,共5页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(41174005
41474009)
