GPS基准站坐标分量时间序列的噪声特性分析

NOISE PROPERTIES IN TIME SERIES OF COORDINATE COMPONENT AT GPS FIDUCIAL STATIONS

用功率谱密度和谱指数估计的方法对中国大陆不同地理位置上的3个GPS基准站的站坐标分量的噪声时间序列特性进行了分析。结果表明,所有9个位置分量的噪声时间序列都具闪烁噪声加白噪声的特点,这与世界上其它地方的许多GPS连续站的分析结果一致,可能说明这种噪声特征是GPS观测技术固有的。因此,在分析GPS观测得到的时间序列时,应当顾及这种噪声特性,适当地加权以得到比较切合实际的结果。详细介绍了分析的步骤和方法,对进一步的研究提出了建议。

The noise properties in time series of coordinate component at three GPS fiduacial stations distributed in different geographical locations are analyzed by use of power spectral density and spectral index method. The results indicate that all the noise time series of 9 coordinate components have the property of flicker noise plus white noise. It is consistent with the results obtained at many other GPS fiducial stations around the world. The results indicate that the noise property may be inherent property of the GPS observation technique. So that, analyzing the time series obtained by the GPS observation, the noise property should be taken into account and the observations should be weighted correctly in order to fit in the actual situation. The analysis method and procedures are introduced and some proposals for further study are also given.