顾及最小加权几何精度因子的轻量级快速选星方法  

Lightweight fast satellite selection method based on minimum weighted geometric dilution precision

作　　者：沈豪亮 刘晖[1] 王怡欣 钱闯 SHEN Haoliang;LIU Hui;WANG Yixin;QIAN Chuang(GNSS Research Center,Wuhan University,Wuhan 430079,China;Intelligent Transportation Systems Research Center,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉大学卫星导航定位技术研究中心,湖北武汉430079 [2]武汉理工大学智能交通系统研究中心,湖北武汉430070

出　　处：《测绘通报》2024年第5期85-89,共5页Bulletin of Surveying and Mapping

基　　金：国家重点研发计划(2021YFB2501105)。

摘　　要：随着导航卫星数量的提高和芯片技术的发展,GNSS终端可观测卫星数大大增加,极大地改善了卫星几何结构。但是,若将全部观测卫星均进行高精度定位解算,终端所需的计算资源和功率消耗会快速增长。针对该问题,本文提出了一种基于加权几何精度因子(WGDOP)的快速选星方法,在可解算卫星数受限时,轻量级快速获取具有最优几何结构和信号质量的卫星组合。试验结果表明,相比于传统基于几何精度因子(GDOP)的选星方法,在可解算卫星数小于15颗时,本文方法在精度和固定率方面分别提高了10倍和40%。另外,基于AG3335芯片进行的实时RTK测试,通过本文方法选择20颗卫星计算,可以极大地降低定位解算耗时且同时保持较高的定位精度。With the increase in the number of navigation satellites and the development of chip technology,the number of observable satellites from GNSS terminals has greatly increased,greatly improving the satellite geometry.However,if all observation satellites are required to perform high-precision positioning calculations,the computing resources and power consumption required by the terminal will increase rapidly.To address this problem,this paper proposes a fast satellite selection method based on(weighted geometric dilution precision,WGDOP).When the number of satellites that can be solved is limited,a satellite combination with optimal geometric structure and signal quality can be obtained quickly.Experimental results show that compared with the traditional satellite selection method based on(geometric dilution precision,GDOP),when the number of satellites that can be solved is less than 15,the method proposed in this paper improves the accuracy and fixation rate by 10 times and 40%respectively.Then a real-time RTK test is conducted based on the AG3335 chip.Using the method in this article to select 20 satellites for calculation can greatly reduce the time-consuming of positioning calculation while maintaining high positioning accuracy.

关 键 词：低成本芯片 加权几何精度因子 轻量级快速选星算法 芯片应用测试 

分 类 号：P208[天文地球—地图制图学与地理信息工程]