电离层高阶项改正对我国陆态网测站坐标的影响

通过不同的方案设计对中国陆态网测站进行解算，研究电离层高阶项延迟对测站坐标和接收机钟差的影响，并分析在不同地磁模型下的影响差异。结果表明，在太阳活动较为活跃时，电离层高阶项延迟对陆态网测站垂向坐标的影响能达到1.2 cm，对接收机钟差的影响接近4.4 mm；不同地磁模型下电离层高阶项延迟的影响很小。还分析了纬度、基线方向与长度对电离层高阶项延迟的影响。

Analysis of Higher-order Ionospheric Effects on CMONOC Coordinate Variations

By designing different scenarios, we can solve stations of CMONOC, in order to analyze the influences of higher-order terms ionospheric delay and receiver clock error to CMONOC stations’ coordinates, and the differences of higher-order terms ionospheric delay's effect under different geomagnetic models. The results show that as solar activity becomes more active, the change of higher-order terms ionospheric delay to CMONOC stations' vertical coordinates can reach 1.2 cm. The influence on the receiver clock error is close to 4.4 mm, the influences of the higher-order ionospheric delay model under different geomagnetic conditions are little. Finally, we discuss and analyze the effect of latitude, baseline length and direction to the higher-order terms ionospheric delays.