GPS参考站系统误差近实时估算方法

针对网络RTK技术中系统误差(主要包括残余的电离层与对流层及轨道误差等)的估算问题.提出一种近实时计算系统误差的方法.新方法采取两项措施,1)将经过双差电离层无关组合的码与相邻历元相位差值作为基本观测量;2)把系统误差当作待估参数,结合中长基线参考站已知坐标的先验信息,利用Tikhonov正则化原理和选权拟合方法,求解出系统误差.以1条中长基线的实测数据为例,新方法用2个历元数据就求解系统误差.与现有的方法相比新方法具有快速、使用方便等特点.

Method to estimate near real-time systematical errors suitable for GPS network

In view of the systematic errors in the technology of network RTK,(including residual ionospheric delay,tropospheric delay and orbit errors),this paper brings forwards a new approach to estimate the systematical errors for near real time.This new method adopts two measures,1) regarding code and phase difference between two sequence epochs by the double difference(DD) ionosphere-free combinations as basic measurements;2) considering the systematic errors as the parameters to be estimated and combining the known coordinates' apriori information of medium-long baselines,then use Tikhonov regularized principle and select weight fitting idea to compute the systematic errors.In this study,we use one baseline to compute the systematic errors.Compared with the existing methods,this approach is rapid and convenient.