一种卫星导航接收机自主完好性检测新算法

A New Algorithm on Satellite Navigation Receiver Autonomous Integrity Monitoring

随着我国北斗系统的不断建设完善,在北斗卫星导航设备中,接收机的自主完好性(RAIM)越来越受到重视,它利用导航卫星的冗余信息对导航解进行一致性检验,从而达到完好性的监测,保持系统的稳定,保证定位的完好性。RAIM的关键技术有故障检测和故障识别两方面,在系统不低于5颗星时能够完成故障的检测,如果需要检测出故障卫星,则至少需要6颗卫星信息,同时文中也对时钟辅助方式下的故障处理进行了说明。仿真结果表明通过该完好性算法,能够有效地检测故障和识别故障星,保持定位精度,且算法复杂度较小,易于工程实现。

With deep development of the COMASS, the receiver autonomous integrity monitoring algorithm is obtaining more focus than before, which is used to check the consistency of the position solutions according to the reluctant information from the navigation satellites. In the algorithm, both error-detecting and error-identifying are key techniques. When more than four navigation satellites are available, error-detecting function can be done. When more than five navigation satellites are available, further error-identifying function can be done. In the paper, a new algorithm, in which a standard clock is cooperated with the error-detecting and error-identifying techniques, is proposed. Final, the simulation results demonstrate that the algorithm is easy to realize in engineering and has a low complexity. Meanwhile, under the above conditions, it can work well and effectively.