星载GPS接收机RAIM算法性能及参数影响分析

为提高星载GPS接收机的故障鉴别与故障隔离能力,研究了星载接收机自主完好性监测(RAIM)算法的性能,以及参数选取对性能的影响;给出了RAIM算法的可用性及RAIM算法应用的可靠性衡量指标,并推导了内、外灵敏度的计算方法。设计了2种适合于高动态在轨应用环境的参数场景,并基于这2种场景,利用在轨数据分析了性能之间的相互制约关系及不同参数对性能的影响。仿真结果表明:若定位告警门限取300m,可以保证90%的RAIM算法可用性;对于20m的测量误差,能够保证80%的检测概率。将不同性能与先验参数的影响关系具体化,可为不同环境、背景下RAIM算法在工程应用中的参数选取及性能评估提供参考。

Performance and Parameters Impact Analysis of RAIM Algorithm on Spaceborne GPS Receiver

To improve the fault identification and fault isolation capabilities of the spaceborne GPS receiver, the paper analyzes the spaceborne RAIM （receiver autonomous integrity monitor） algo- rithm performance and the impact of parameter selection on its performance. The availability and reliability of RAIM algorithm are researched, and the calculation method of the inner and outer sensitivity are given. Two sets of parameters suitable for high dynamic environment are designed based on which the mutual restraint of these performances are analyzed by using in-orbit data. The simulation results show that 90~ availability can be guaranteed if the positioning alarm threshold is a maximum of 300m, and 80~//oo detection probability can be achieved when the meas- urement error is 20m. After the relationship between performances and priori parameters is speci- fied, a reference for the parameter selection and performance assessment of RAIM algorithm in different engineering application environments can be provided.