基于北斗多频观测数据的单历元高精度定位方法OA

With the completion and operation of the BeiDou navigation satellite system(BeiDou)-3 global constellation,China has become the third country,after the United States and Russia,to possess autonomous global navigation capabili-ties.At this stage,the BeiDou system is continuously optimizing its positioning service performance.The BeiDou-2 satel-lites have already achieved triple-frequency observation capabilities,while the new generation BeiDou-3 satellites have achieved a technological leap by enabling five-frequency signal transmission.Against this backdrop,it is particularly impor-tant to conduct in-depth research on the optimal combination methods for multi-frequency observation data,as this can sig-nificantly improve the efficiency of integer ambiguity resolution and further enhance the system's positioning accuracy.This paper systematically explored the combined application schemes of multi-frequency observation data.Based on the triple-frequency observation data from BeiDou-2 and the quad-frequency observation data from BeiDou-3,corresponding linear combination mathematical models are established,and a strategy of joint processing with independent observations from mul-tiple systems was employed.Experiments were conducted using real observation data to evaluate positioning performance under short-baseline conditions.The analysis of experimental results indicates that by adopting the multi-system fusion pro-cessing method proposed in this paper,rapid and stable fixing of short baseline ambiguities can be achieved within a single epoch,ultimately resulting in positioning accuracy at the centimeter level.This provides a technical solution and implementa-tion strategy for the engineering application of high-precision navigation and positioning technology.