利用组合导航设备定位时,选择适当数量的卫星用于定位对于减少接收机通道使用数量、缩短定位时间具有重要意义。基于次优卫星选择算法设计一种新的组合导航卫星选择算法,该算法利用可视卫星与接收机之间的单位向量和测距误差计算每颗卫星的价值;采用迭代的方式从可视卫星中选择价值最大的加入辅助卫星集合。仿真结果显示,这种新的卫星选择算法能够显著缩短卫星选择时间,提高定位精度,满足组合导航设备定位要求。

The satellite selection algorithm is important when using integrated navigation equipment to estimate position. Selecting part of all visible satellites will limit the number of channels and reduce processing time. By analyzing the principle of quasi-optimal satellite selection algorithm, an improved weighted quasi-optimal satellite selection algorithm was proposed. The main idea of this algorithm is calculating value of all visible satellite using the unit user-satellite vectors and ranging errors. In each iterate, the satellite with the highest importance value is selected to the assistant satellite set. The simulation results show that, the proposed algorithm costs less time with simple calculation by comparision with other satellite selection algorithms. The proposed algorithm satisfies the requirements of integrated navigation receivers.