附加高程信息的RAIM算法研究

Research on RAIM Algorithms with Elevation Information

研究卫星导航定位优化问题,在可用星较少的情况下提高定位精度和可靠性,是卫星导航接收机的难题。为提高定位精度,提出了一种在航海导航等已知高程信息的应用领域,加入高程方程后的RAIM算法,可以将RAIM算法需要的卫星数量降低到4颗,且在一定条件下能够实现双星故障的RAIM算法。进行仿真分析的结果表明,改进方法有效改进了单星和双星故障RAIM算法的可用性,并可在实际应用中,提高接收机在已知高程条件下的定位精度和可靠性。

It is a realistic difficult problem about how to improve the positioning accuracy and the reliability of RAIM algorithms, on the situation that there are not enough available satellites. This paper put forward a RAIM algorithm which adds the elevation information in the areas as marine navigation. This method can reduce the number of the satellites needed by RAIM algorithms to four and realize the RAIM algorithms in the case of two faulty satellites. According to the emulation analysis, this method can effectively improve the availability of fault detection of RAIM algorithms for one faulty satellite and two faulty satellites. In practice, it has profound guiding significance for the improvement of the positioning accuracy and the reliability of the receiver with the elevation information.