The Chandler wobble excitation function (hereinafter, geodetic excitation) is obtained by removing the seasonal components and low frequency components with periods from several years to decades from the polar motion excitation function derived from SPACE2002 series. The geophysical excitation functions of the individual AAM, OAM, HAM, and two combined excitations of the AAM + OAM and AAM + OAM + HAM at 1d, 5d, 1m and 3m in- tervals are statistically tested for the hypothesis of the nor- mality, and then tested for the hypotheses of identical distri- bution between the geodetic and the geophysical excitations. The results show that, among the total 16 components of the two combined excitation functions at 1d, 5d, 1m and 3m in- tervals,most follow random normal processes, the hy- potheses of identical distribution between the geodetic exci- tation and the two combined excitation are acceptable, while most of the hypotheses of identical distribution between the geodetic excitation and the individual excitations of the AAM, OAM, and HAM are rejectable. These results elucidate from a new point of view, that the excitations from AAM, OAM, and HAM are the main sources of the Chandler wobble, and the Chandler wobble excitation function is of a random normal property.
CH20041132多波束测深数据的异常检测和滤波=Detecting Outliers and Filtering Noisesin Multi-Beam Data/阳凡林,刘经南,赵建虎(武汉大学)//武汉大学学报(信息科学版).-2004,29(1).-80-83根据较大区域的测深数据的分布特性,提出了一种基于中值滤波、局部方差检测和小波分析相结合的方法来定位异常数据,并滤去随机噪声。图6表1参15CH20041133海洋非潮汐变化对时变重力场的影响=Nontidal Oceanic Effects on Temporal Variations in the Earth’s Gravitational Field/朱耀仲,闫昊明,钟敏(中国科学院测量与地球物理研究所)
