中文摘要：

基于坐标模式的广义网平差模型，利用IGS发布的对GPS全球站处理后形成的单天解SINEX文件，通过自编软件计算了IGS测站的时间序列，并发现IGS测站存在非线性变化。利用频谱分析方法得出了IGS测站存在年周期或半年周期的变化，同时利用经验模型建立了IGS测站的测站速度函数。指出了仅利用1个线性量估计IGS跟踪站的速度值会存在偏差，应建立周期性变化模型，或采用分段线性化的方法，每隔一定的时间给出1个对应的速度。

英文摘要：

With the daily SINEX files of IGS, the time series of IGS stations are obtained by independently developed software under generalized network adjustment model with coordinate pattern. From the time series, non-linear motion are found. With spectral analysis method, the variation frequency of site velocity are found. Moreover, the empirical model of the velocity variation of the station has been established by regressive analysis method based on week solution coordinate series of the station. With respect to the velocity of IGS tracking station, it had better to model the variation periodically or to give a velocity periodically using piece-wise linear function rather than using a linear variable to estimate its bias.