DISCUSSION ON SOME FFT PROBLEMS TO DETERMINE THE GEOID

作     者：Essam Ghanem LI Jiancheng 

作者机构：GPS Center Wuhan Technical University of Surveying and Mapping Wuhan China 

出 版 物：《Geo-Spatial Information Science》 (地球空间信息科学学报（英文）)

年 卷 期：2000年第3卷第2期

页      面：53-57页

学科分类：08[工学] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 

主　　题：fast Fourier transformation (FFT) geoid determination 

摘      要：The aim of this investigation is to study some FFT problems related to the application of FFT to gravity field convolution *** the others,such as the effect of spectral leakage,edge effects,cyclic convolution and effect of padding,are also discussed.A numerical test for these problems is made.A large area of Western China selected for the test is located between 30°N～36°N and 96°E～102°E and includes 1 858 gravity observations on *** results show that the removal of the bias in the residual gravity anomalies is important to avoid spectral *** hundred percent zero padding is highly recommended for further research of the geoid to remove cyclic convolution errors and edge effects.1_D FFT is recommended for precise local geoid determination because it does not use kernel approximation.