摘要
在多个系统组合定位模式下,可视星数量大幅增加,为更精准稳定的定位提供了可能。在现有选星算法中,由于未考虑实际作业中的一些问题,如:障碍物对卫星信号传播路径的遮挡等,估算得到的较好卫星选取方式在实际定位中无法正常发挥作用,同时在接收机内部计算中会应用大量的矩阵求逆运算,增加了计算量,占用了较多的系统资源。提出了基于可视星仰角来初筛卫星,通过GDOP结合星座四面体法得到选星组合的方法。讨论了设定卫星仰角时的取舍问题。新算法在理想情况和实际情况下寻找有效定位平衡点,以规避无效选星并减少计算量。
In multiple systems integrated positioning mode,a substantial increase in the number of visible stars offers the possibility to locate more precise and stable.In the existing stars selecting algorithms,since a number of issues in the actual job are not considered,such as the spreading path be blocked by some obstacles,better estimated selection in actual location cannot work well,while the receiver will use a lot of internal calculation of matrix inversion,increasing the amount of calculation,taking up more system resources.Based on the visible star elevation to screen satellite,a star selecting algorithm which is combining methods by using GDOP and constellation tetrahedron is presented.Issues related to the setting of the satellite elevation are discussed.The new algorithm finds effective positioning balance between the ideal case and the actual situation,in order to avoid invalid election stars and reduce the amount calculated.
出处
《测控技术》
CSCD
2015年第8期111-113,118,共4页
Measurement & Control Technology
