一种GPS单历元整周模糊度固定方法  

An algorithm for GPS integer ambiguity resolution on single-epoch

作　　者：刘会[1] 郑衍宁 徐琪尧 王胜利[2] 

机构地区：[1]山东科技大学测绘科学与工程学院,山东青岛266590 [2]山东科技大学海洋工程研究院,山东青岛266000

出　　处：《导航定位学报》2016年第2期57-61,共5页Journal of Navigation and Positioning

基　　金：大地测量与地球动力学国家重点实验室开放基金项目(SKLGED2015-3-1-E)

摘　　要：传统的LAMBDA算法一般需要利用多个历元的观测数据,所需观测时间相对较长;同时确定模糊度的过程中需要对周跳进行探测和修复,以决定是否继续搜索确定模糊度,或是开始下一轮搜索。提出一种标准相位-伪码组合(MW组合)解算单历元模糊度的方法:在宽巷模糊度搜索的基础上,通过确定宽巷模糊度候选集合,直接取整求解L1载波模糊度;并将L1固定解代入双差观测方程中进行最小二乘解算,依据单位权中误差确定最优的宽巷模糊度组合,实现单历元整周模糊度快速固定。结果表明,采用MW组合的单历元模糊度固定法的模糊度固定成功率可达到94.77%。该方法避免了模糊度解算中的秩亏问题,无需进行周跳探测,可用于动态实时定位。Aiming at LAMBDA algorithom that needs a long observation time in multi-epoch ambiguity fixing,an algorithm using standard phase-code combination（MW-combination）was proposed.The solving efficiency of integer ambiguity resolution about LAMBDA algorithom was significantly affected by the demand of cycle-slip detection and repair which decided whether to continue fixing ambiguity.The algorithm which based on the wide-lane ambiguity resolution,permutated and combined the wide-lane ambiguity and fixed the L1 ambiguity by direct integral method.The algorithm substituted L1 ambiguity into observation equation to realize the rapid integer ambiguity fixing on single-epoch by using the least-squares method,and the combinations with the smallest unit weight mean square error was optimal.The results illuminated that the method of ambiguity resolution on single-epoch with the MW-combination could reach the success rate of ambiguity fixing of 94.77%.The algorithm avoided rank defect problem in integer ambiguity resolution and dispensed with cycle-slip detection,which could be applied in RTK（real time kinematic）.

关 键 词：模糊度固定 MW组合 单历元解算 整周模糊度搜索 

分 类 号：P228[天文地球—大地测量学与测量工程]