GRACE时变重力场的高斯平滑研究  

STUDY ON GAUSSIAN SMOOTHING OF GRACE TEMPORAL GRAVITY VARIATION

作　　者：周新[1] 邢乐林[1] 邹正波[1] 李辉[1] 

机构地区：[1]中国地震局地震研究所

出　　处：《大地测量与地球动力学》2008年第3期41-45,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40704009)

摘　　要：利用各向同性和非各向同性两种GRACE时变重力场平滑方法试算了2006年1月至2月的全球大地水准面变化。研究表明,非各向同性的高斯滤波器的频谱不仅依赖于阶也依赖于次,但能够提高纬度方向的分辨率,在经度方向的分辨率和各向同性滤波器的相当;计算得到了与各向同性高斯平滑同精度的时变重力场反演结果。Two methods isotropic Gaussian filter and non-isotropic Gaussian filter of GRACE temporal gravity variation smoothing, and their properties are studied. With these methods, the global geoid change between January and February 2006 was computed. The results show that non-isotropic Gaussian filter＇ s spectrum depends not only on degree but also on order; the non-isotropic smoother yields enhanced GRACE signals with significantly higher spatial resolution in latitude and the same resolution in longitude without reducing the accuracy as compared to isotropic Gaussian filter.

关 键 词：GRACE时变重力场 高斯平滑 非各向同性 频谱 大地水准面 

分 类 号：P312.1[天文地球—固体地球物理学]