精密单点定位在网络RTK中的应用研究

Application research of precise point positioning in network RTK

针对网络实时动态差分(RTK)技术中,当用户不在网内或基线距离较长时,致使解算的模糊度不固定或固定错误,使得大气改正数的精度降低或生成错误的虚拟观测值的情况,提出使用精密单点定位技术计算参考站非差对流层、电离层信息,进而构建虚拟参考站对流层、电离层改正信息的方法。从函数模型方面详细论述了精密单点定位和基线解算方法计算虚拟参考站对流层、电离层改正信息的过程,并结合中海达全球精度提供的精密轨道、钟差等服务端实时数据及自建参考站数据进行实时定位测试,验证了该方法的有效性。实验表明,该方法计算的对流层、电离层信息组双差后与基线解算的双差大气信息一致,终端定位精度与固定率也基本一致,从而验证了该方法应用于网络RTK的可行性。

Aiming at the problem that the network Real-Time Kinematic(RTK)cannot provide services when the user is not in the network or the baseline is long,this paper proposes a method of using Precise Point Positioning(PPP)to estimate tropospheric and ionospheric atmospheric information,and then construct the atmospheric corrections of virtual observations.The process of calculating tropospheric and ionospheric correction information of Virtual Reference Station(VRS)by PPP and baseline solution method is discussed in detail from function model,and real time precise orbit and clock provided by Hi-Target is used to verify the effectiveness of the method.The experiment results show that the double difference of troposphere and ionosphere information calculated by this method is consistent with the double difference atmospheric information of baseline,as well as the terminal positioning accuracy and the fixed rate.