%0 Journal Article
%A GONG Guo-jing
%A LUO Dai-sheng
%A HE Xiao-hai
%T Study of least squares phase unwrapping algorithm based on unweighted multi-grid
%D 2010
%R 10.3778/j.issn.1002-8331.2010.04.053
%J Computer Engineering and Applications
%P 166-169
%V 46
%N 4
%X Phase unwrapping of Interferometric Synthetic Aperture Radar（InSAR） is one of the most important steps to obtain an accurate DEM（Digital Elevating Model） and reconstruct 3-D landform images.The theories of interferometric and InSAR 2-D phase unwrapping based on least square are presented.Unweighted multi-grid algorithm which is used to solve Partial Differential Equation（PDE） on larger grids with fast calculating rate is proposed to solve the discrete Poisson equation.The method can transform low frequency components to high frequency components，wipe off quickly using Gauss-Seidel relaxation and smoothen multi-frequency errors.It is indicated that the convergence speed is the same as FFT and DCT with higher unwrapping accuracy.
%U http://cea.ceaj.org/EN/10.3778/j.issn.1002-8331.2010.04.053