卫星天线相位中心改正模型对参考框架转换中尺度参数的影响分析

计算了7个IGS分析中心第二次重新处理单天解与IGS14之间的尺度参数，并采用极大似然方法对其进行分析，比较两种GNSS卫星天线相位中心改正模型对尺度参数序列噪声模型、平均偏移量、速度及季节性信号的影响。结果表明，所有尺度参数的随机特性均可由白噪声加幂律噪声较好地描述，不同分析中心的尺度参数速度值在-0.22～-0.15 mm/a之间变化，尺度参数的周年信号显著，半周年信号相对较弱；卫星天线相位中心改正模型的变化对尺度参数的平均偏移量影响显著，对其随机特性、速度及季节性信号影响较小。

Analysis of Impact of the Satellite Antenna Phase Center Correction Model on Scale Parameters of Helmert Transformation

We calculate the scale parameters of the daily solutions of the IGS second reprocessing campaign with respect to the IGS14 from 7 analysis centers(ACs), analyze the scale parameters using the maximum likelihood method, and investigate the impact of 2 different GNSS antenna phase center correction models on noise characteristics, the long-term rate and seasonal signals of scale parameters. The results show that all the scale parameters exhibit correlated noise that is better represented by a white plus power law noise model. The rates estimated from the scale parameters fluctuate between -0.22 and -0.15 mm/a depending on different ACs. The seasonal signals show the significant annual signals and the weak semi-annual signals. The change of GNSS antenna phase center correction models has a significant effect on the mean scale offset, but there are no obvious variations of noise characteristics, the rate and seasonal signals.