摘要
整周模糊值的快速确定,特别是利用一个历元数据确定整周模糊值,一直是GPS高精度实时定位的热点问题。根据双频相位数据的内在关系,提出了观测值域整周模糊值误差带的概念,并在此基础上通过在观测值平差值域和模糊值域两域交叉搜索的方法,只采用一个历元的C/A码和双频相位数据即可确定GPS相位整周模糊值,称为双频相关法。该方法随着GPS现代化中第三频率的使用,将更加有效。该方法较好地解决了GPS动态定位中多年来的一个难题,使得GPS实时定位技术得以实现,也可省略周跳修复工作。
For years, the fast ambiguity resolution method, especially that using a single epoch data, has been always a challenging issue in the precise GPS positioning. A new approach that is named as Dual Frequency Correlation Method (DUFCOM) is proposed for performing GPS carrierphase ambiguity resolution using singleepoch C/A code and dual frequency data. Based on the inner correlation of dual frequency carrier phase data and the statistic characteristic of carrier phase observation error, the concept of error strip of ambiguity in observation space is introduced firstly. Then the further search in the intersection of adjusted observation space and ambiguity space is carried out. At the same time, the sparse characteristic of the final space is discussed. The intersection search technique greatly enhances the efficiency by reducing the number of sets of ambiguities that needs to be searched. This reliable approach, which resolves the puzzle in dynamic GPS positioning, is proved to have high success rate though a great deal of experiments. It makes real possible for the efficient realtime positioning method, as well as the detection and reparation for cycle slips can be skipped.
出处
《测绘学报》
EI
CSCD
北大核心
2003年第3期208-212,共5页
Acta Geodaetica et Cartographica Sinica
