CME对IGS基准站坐标序列噪声模型及速度估计影响分析

Analysis of influence of CME on noise model and velocity estimation of IGS base station coordinate sequence

以50个IGS基准站坐标时间序列为研究对象,采用赤池信息量准则(BIC)模型估计准则对四种组合噪声特性进行估计分析,探讨共模噪声(CME)对IGS基准站坐标时间序列噪声模型及站速度影响.结果表明CME会导致IGS基准站坐标序列噪声模型的有偏估计,并影响站速度的确定精度,准确估计基准站速度参数时应对CME进行修正;经CME修正后IGS基准站周年运动周年项振幅有所减小,高程方向更为明显,表明滤波后IGS基准站周年运动相对稳定.

In this paper,the coordinate time series of 50 IGS base stations are taken as the research object.The BIC model estimation criterion is used to estimate and analyze the four combined noise characteristics.The influence of CME on the IGS base station coordinate time series noise model and station velocity is discussed.The results show that CME can lead to the biased estimation of the noise model of the IGS base station coordinate sequence,and affect the accuracy of the station velocity.When the base station velocity parameter is accurately estimated,the CME should be corrected.After the CME correction,the annual motion of the IGS base station has an amplitude.The decrease is more obvious in the elevation direction,indicating that the filtered IGS base station annual motion is relatively stable.