基于坐标旋转法的最差用户位置算法研究  

Worst user location calculation algorithm based on coordinate rotation method

作　　者：王尔申 曲萍萍[1] 黄煜峰 房启志 庞涛 赵为平 WANG Er-shen;QU Ping-ping;HUANG Yu-feng;FANG Qi-zhi;PANG Tao;ZHAO Wei-ping(School of Electronic and Information Engineering,Shenyang Aerospace University,Shenyang 110136,China;Liaoning General Aviation Key Laboratory,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学电子信息工程学院,沈阳110136 [2]沈阳航空航天大学辽宁省通用航空重点实验室,沈阳110136

出　　处：《沈阳航空航天大学学报》2019年第5期60-65,共6页Journal of Shenyang Aerospace University

基　　金：国家自然科学基金(项目编号:61571309);辽宁“百千万人才工程”(项目编号:04021407);辽宁省自然科学基金(项目编号:2019-MS-251);辽宁省教育厅项目(项目编号:L201705,L201716,UPRP2018198);辽宁省高等学校优秀人才支持计划(项目编号:LR2016069)

摘　　要：最差用户位置WUL(Worst User Location)是空间信号完好性参数计算过程中的一个重要部分,针对传统WUL计算方法存在的搜索效率低的问题,研究了一种改进的临界圆算法。改进的算法基于坐标旋转公式,通过坐标旋转使目标点与已知点处于同一平面上,减少了由于点不共面而产生的迭代次数,提高了搜索效率。以GPS为例,使用IGS(International GPS Service)提供的GPS导航电文和精密星历数据对改进的临界圆算法进行仿真验证。结果表明,改进的临界圆算法搜索次数远小于传统的临界圆法,搜索效率得到提升。Worst user location(WUL)is an important part of the calculation of the signal-in-space(SIS)integrity algorithm.For the problem of low search efficiency in traditional WUL calculation methods,an improved critical circle algorithm is studied.The improved algorithm is based on the coordinate rotation formula.The coordinate rotation makes the target point and the known point on the same plane,which reduces the number of iterations caused by the points not coplanar,and improves the search efficiency.Taking global positioning system(GPS)as an example,the paper uses the GPS navigation message and precision ephemeris data provided by international GPS service(IGS)to verify the improved critical circle algorithm.The results show that the search frequency of the improved critical circle algorithm is much smaller than the traditional method,and the search efficiency is significantly improved.

关 键 词：全球卫星导航系统 空间信号 完好性 最差用户位置 临界圆法:坐标旋转法 

分 类 号：O213.2[理学—概率论与数理统计]