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DISCUSSION ON SOME FFT PROBLEMS TO DETERMINE THE GEOID

Geo-Spatial Information Science 2000年第2期3卷 53-57页

作者： essam ghanem li jiancheng GPS Center Wuhan Technical University of Surveying and Mapping Wuhan China

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.

关键词： fast Fourier transformation (FFT) geoid determination

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Models for Fitting Gravimetric Geoids and GPS Results

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Geo-Spatial Information Science 2002年第1期5卷 28-30页

作者： essam ghanem li jiancheng liU Jingnan Banha Higher Institute of Technology (BHIT) Banha Egypt

The aim of this investigation is to study how to use a gravimetric (quasi) geoid for levelling by GPS data in an optimal *** advent of precise geodetic GPS has made the use of a technique possible,which might be called GPS_ gravimetric geoid *** this approach,GPS heights above the reference ellipsoid are determined for points whose levelled (orthometric) height H is above sea level people have already surveyed;for these points,we thus have the values of the geoid undulation N .These values are then used to constrain the geoid undulations N′ obtained from the gravimetric solution.

关键词： gravimetric geoid GPS/levelling fitting

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ANNOUNCEMENT

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Geo-Spatial Information Science 2001年第1期4卷 23-23页

作者： essam ghanem li jiancheng

In order to meet the requirements of the newly-founded Wuhan University to have uniform administration over the ***-spatial Information Science (Quarterly) takes some changes as follows.　　*** sponsor,formerly being Wuhan Technical University of Surveying and Mapping,is now Wuhan University.　　*** department in charge,formerly being the State Bureau of Surveying and Mapping,now is Ministry of Education.　　*** Periodicals Press of Wuhan Technical University of Surveying and Mapping is changed into Wuhan University Journals Press.　　The principle,content,stylistic rules and layout,and service range of the Journal keep *** shall distribute the Geo-spatial Information Science to those who subscribe in 2001.

关键词： Information Science range of

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