远距离下CORS的双差电离层延迟内插模型精度分析

CORS Double-Difference Ionospheric Delay Interpolation Model Accuracy Analysis Over Long Distances

为了验证传统的内插模型能否满足远距离下连续运行参考站系统(CORS)的双差电离层延迟精度的需求.通过构建电离层双差观测方程,以线性内插模型(LIM)和距离相关线性内插模型(DIM)为研究对象,以虚拟参考站技术(VRS)为代表,将解算得到的监测站双差电离层延迟与通过LIM和DIM内插算法得到的监测站双差电离层延迟进行对比,分析这两种模型在远距离CORS网下的双差电离层延迟内插效果.实验结果表明,在远距离CORS网监测站条件下,LIM模型的内插精度高于DIM模型内插精度.

In order to verify whether the traditional interpolating model can meet the re quirement of double difference ionospheric delay accuracy of the continuously operating refer ence station CORS system at a long distance. By constructing an ionospheric double differ ence observation equation, linear interpolation model （LIM） and distance dependent linear interpolation model （DIM） are taken as the research object, and virtual reference station technology （VRS） is represented as the representative monitoring station. The differentiali onospheric delay is compared with the double difference ionospheric delay of the monitoring station obtained by LIM and DIM interpolation algorithm. The two models are analyzed un der the long distance CORS network. The double difference ionosphere delay interpolation effect. The experimental results show that the interpolation accuracy of the LIM model is higher than that of the DIM model under the condition of the remote CORS network monito ring station.