高动态GPS/INS组合导航中一种新的选星算法  

A Novel Algorithm of Selected Satellite For High Dynamic GPS/INS Integrated Navigation

作　　者：任磊[1] 王雪梅[1] 

机构地区：[1]第二炮兵工程学院303教研室,陕西西安710025

出　　处：《计算机测量与控制》2011年第12期3096-3098,3101,共4页Computer Measurement &Control

摘　　要：传统的GPS选星算法采用高度角对可用星进行判断,然后选择具有最佳几何精度因子的卫星组合进行导航;由于最佳几何精度因子法的运算量大,很难适用于高动态环境对实时性的要求;因此,通过建立可用星圆锥体,并结合模糊选星算法的思想,提出一种基于惯性导航系统辅助的GPS选星算法;仿真结果表明,新的算法能够根据载体姿态信息,有效地进行可见星判断和卫星组合选择,运算时间比最佳GDOP值法降低约80%,精度较模糊选星算法更优。Based on the determination of available GPS satellites with elevation angle, 4 satellites with the minimal Geometric Dilution Of Precision （GDOP） was employed to navigation in traditional algorithm of selected satellite. Owing to its enormous computation, traditional algorithm doesn＇ t work well in high dynamic conditions. By utilizing the method of building a cone of available GPS satellites and the theory of fuzzy selection of GPS satellite, a new algorithm for selecting satellite with INS--aided is presented. Simulation results prove that the new algorithm can determine and select the available GPS satellites depend on the output information of the INS, with 80 % calculation time less than GDOP and higher accuracy, better stability than fuzzy selection.

关 键 词：GPS/INS组合导航 选星 几何精度因子 高动态 

分 类 号：V224[航空宇航科学与技术—飞行器设计]