GPS/BDS/GLONASS组合系统相对定位选星算法

通过分析多系统相对精度衰减因子(RDOP)与选星数的关系,借鉴选星前后几何精度衰减因子(GDOP)差值随选星数变化的负指数衰减模型,利用从苏州获取的卫星数据,对选星前后的RDOP差值与选星数的关系进行了分析。根据可见星的空间分布规律,提出了一种基于卫星高度角和方位角进行分区筛选的快速选星算法;并利用从河南获取的卫星数据对该算法进行了验证。结果表明,该算法具有良好的稳定性,相比于最小RDOP法,以损失少量的精度换取了计算量大幅度的减少。

Research on the Satellites Selection Algorithm for Multi System Relative Positioning

By analyzing the relationship between the relative dilution of precision (RDOP) of multiple systems and the number of satellites selection, the negative exponential decay model of the geometric dilution of precision (GDOP) difference with the number of satellite selection before and after was used for reference, and the relationship between the RDOP difference and the number of satellite selected before and after selecting satellite was analyzed by using the satellite data obtained from Suzhou. A fast satellites selection algorithm was proposed according to the spatial distribution of visible satellites, which was screened partition based on the altitude angle and azimuth angle of satellites. The algorithm was verified by the satellite data obtained from Henan. The results show that the algorithm has a good stability. Compared with the minimum RDOP method, the algorithm can reduce the computational complexity with a less loss of accuracy.