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利用UTCSR发布的2003-01~2013-07GRACE RL05月平均重力场模型,分析比较了高斯滤波、各向异性滤波、扇形滤波和维纳滤波,并结合去相关滤波在反演南极地区冰盖质量变化方面的差异。通过计算得到以下结论:1基于121组重力场模型阶方差分布得到维纳滤波与半径为300km的高斯滤波效果最为接近,说明300km滤波半径完全可以满足质量变化信号的提取;2在一定范围内,提高滤波半径能提高反演结果信噪比,建议南极区域的滤波半径为500km;采用相同滤波半径,不同空间滤波算法计算的质量变化率基本一致,在南极区域可以选取任一滤波方法;3与其他算法相比,去相关滤波算法能在一定程度消除球谐系数中存在的系统误差,改善反演结果。
Using Gaussian filter, anisotropic filter, fan filter and Wiener filter, the paper compares and analyzes the changes of ice cover quality in the Antarctic region with the help of the decorrelation filter The difference. The following conclusions are obtained by calculation: 1 The Wiener filter based on the hierarchical distribution of 121 gravitational field model orders is closest to the Gaussian filter with a radius of 300 km, which shows that the radius of 300 km can fully satisfy the quality change signal extraction.2 Within a certain range, It is suggested that the filtering radius of the Antarctic region should be 500 km when the filtering radius is increased, and the quality change rate calculated by different spatial filtering algorithms is basically the same with the same filtering radius. In the Antarctic region, any filtering method can be selected; 3 Compared with other algorithms, the decorrelation filtering algorithm can eliminate systematic errors existing in the spherical harmonic coefficients to a certain extent and improve the inversion results.