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机构地区:[1]61243部队 [2]61206部队 [3]武汉大学测绘学院 [4]61175部队
出 处:《测绘工程》2014年第9期5-8,共4页Engineering of Surveying and Mapping
基 金:国家自然科学基金资助项目(41274020)
摘 要:以中国大陆区域IGS站为例,利用小波变换提取GPS位置时间序列中的半周年、周年、两周年和长期项运动信息,对非线性运动特征的多分辨分析表明:对于周年和半周年运动,水平方向和高程方向的规律特征存在明显差异,两周年运动的周期性较弱且振幅不大,长期项中仍存在较大的波动起伏。对周期性最为明显的垂向季节性运动进行重点分析,从地球物理因素、测站环境和数据解算等方面探讨季节性运动的影响因素。Illustrated in the case of IGS stations in Chinese Mainland, the wavelet transformation is employed to extract the biannual, annual, two-year-period and long-term motional information in the GPS position time series, which are used in the multi-resolution analysis to the nonlinear motional characteristics. It is found that there are obvious differences in the regular features between the horizontal and vertical direction on the annual and biannual motion, while the two-year-period motion reveals the weak periodicity with small amplitude, and the large fluctuation still exists in the long-term items. Through the selective analysis to seasonal vertical movement with the most obvious periodicity, the discussion of the influencing factors causing the seasonal movement is presented from the aspects of physical geographic factor, station environment and data calculation.
关 键 词:GPS位置时间序列 非线性运动特征 小波变换 多分辨分析 季节性运动
分 类 号:P228[天文地球—大地测量学与测量工程]
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