摘要
多模卫星定位相比单一导航系统定位可获得更多数量的可见星,有利于提高定位性能,但导航系统计算量也随之成倍增大,传统的遍历选星算法并不适合多模卫星定位系统的快速选星过程。为此提出了一种北斗/GPS双模复合策略自适应快速选星算法。算法基于几何精度因子(GDOP)、载波信噪比复合策略进行选星,高度角滤角根据可见星数量不同进行自适应调整,快速获取次优星座分布,并通过几何精度因子来衡量星座。最后,将所提算法与传统快速选星算法进行了对比,利用MATLAB进行了仿真分析,发现所提算法在精度上相对最优星座损失很小的情况下,而计算耗时大约为传统最优星座选星法的千分之一,验证了算法在双模卫星定位系统中的有效性。
With Compared with a single navigation system, multi-mode satellite positioning can obtain a larger number of visible stars, which is conducive to improving the positioning performance. However, the calculation volume of the navigation system is also increased accordingly. The traditional traversing star selection algorithm is not suitable for multi-mode satellite positioning. System’s fast star selection process. This paper proposes a Beidou/GPS dual-mode composite strategy adaptive fast star selection algorithm. The algorithm selects stars based on the geometric precision factor(GDOP) and carrier signal-to-noise ratio compound strategy. The height angle filter angle is adaptively adjusted according to the number of visible stars. The suboptimal constellation distribution is quickly obtained, and the constellation is measured by the geometric precision factor. Finally, the proposed algorithm is compared with the traditional fast star selection algorithm, and the simulation analysis is performed using MATLAB. It is found that the proposed algorithm has relatively small relative loss in accuracy and the calculation time is about the traditional optimal. One-thousandth of the constellation selection method validates the effectiveness of the algorithm in dual-mode satellite positioning systems.
作者
李卫东
韩景宇
王新屏
王鹏飞
Li Weidong;Han Jingyu;Wang Xinping;Wang Pengfei(Electronic and Information Engineering,Dalian JiaotongUniversity,Dalian 116028,China)
出处
《电子测量技术》
2020年第7期61-66,共6页
Electronic Measurement Technology
基金
基于北斗卫星导航系统的铁路货物运输的定位研究(20170520190)
关键词
北斗/GPS组合导航
选星算法
几何精度因子
多模卫星定位
BDS/GPS integrated navigation
satellite selection algorithms
geometric dilution of precision
multimode satellite positioning
