GPS/BDS网络RTK非组合模型数据处理方法

Application and positioning perfomance of un-combined model in GPS/BDS network-RTK

针对网络RTK数据处理方法中组合模型计算复杂及不易扩展的问题,提出一种GPS/BDS网络RTK的非组合模型数据处理方法,并对该方法的定位精度和初始化时间进行分析。在该方法中,多频载波和伪距均参与解算,并将站间单差模糊度、双差电离层和对流层延迟作为待估参数。试验结果表明,BDS双频和三频网络RTK水平定位精度均优于1cm(1σ外符合),高程定位精度均优于2cm(1σ外符合),单GPS网络RTK定位精度优于单BDS网络RTK定位精度,GPS/BDS双系统网络RTK定位精度优于单GPS和单BDS系统定位精度;不同频率及系统组合的网络RTK能够提供定位服务的平均初始化时间短于30s。

Aiming at the problems that it is complex of the calculation and is difficult to be extended for the combined model in the data processing of network-RTK,the paper proposed a data processing method of un-combined model for GPS/BDS network-RTK,and analyzed its positioning accuracy and initialization time:multiple frequency carrier and pseudorange were used in calculating,and the single-difference ambiguities between base stations,double-difference ionospheric delay and tropospheric delay were estimated.Experimental result showed that the horizontal positioning accuracy of BDS double-frequency and triple-frequency network-RTK would be better than 1cm(1σexternal accuracy),the vertical accuracy would be better than2cm(1σexternal accuracy),the positioning accuracy of network RTK for single GPS would be better than that for single BDS,and that for GPS/BDS would be better than that for single GPS and single BDS;moreover,the average initialization time of the un-combined model could be less than 30 seconds in positioning service.