电离层内插模型的分析

Analysis on Ionosphere Interpolation Models

常见的电离层延迟内插模型有:线性组合法LCM(Linear Combination Model)、距离相关线性内插法DIM(Distance Based Linear Interpolation Model)、线性内插法LIM(Linear Interpolation Model)和低次曲面模型法LSM(Low-order Surface Model)等。文中对4种模型的基本原理和方法进行了详细的介绍,并利用河北省CORS网的实测数据进行计算分析,从而对模型之间的内插精度进行比较。结果表明,LSM模型的内插精度无论是流动站在网内还是在网外都要稍高于其他3种模型;其他3种模型的内插精度相当。当流动站分别位于网内和网外时,LSM模型的精度变化最小;LIM变化次之;LCM变化最大。

Common ionosphere delay interpolation models include linear combination model, distance based linear interpolation model, linear interpolation model and low-order surface model, et al. The basic principle and method of these kinds of models were introduced in detail. The measured data of Hebei CORS were analyzed, and the com- parison of interpolation accuracy between different models was conducted. The results showed that the interpolation accuracy of LSM model was a little higher than the other three kinds of models whether the rover in network or out- side the network, and the interpolation accuracy of the other three kinds of models was appropriate. Whether the rover in network or outside the network, the change of the accuracy of LSM model was the smallest, that of LIM was the second, and that of LCM was the biggest.