基于地理坐标参数的SAR图像自动概略配准法

提出了一种新的基于地理坐标参数的SAR(Synthetic Aperture Radar)图像自动概略配准方法.该方法利用SAR图像的地理坐标(经纬度)参数,用多项式拟合主辅图像中像元的地理坐标随其图像坐标的变化,首先得到主图像中心像元地理坐标值,然后在辅图像中找到某个像元,其地理坐标等于主图像中心像元的地理坐标,此辅图像中像元的图像坐标与主图像中心像元的图像坐标之差即为概略配准的偏移量.用真实的SAR数据研究证明,本文提出的方法运算速度快,配准精度高.

Automatic SAR Image Coarse Registration Based on Geographical Coordinates Parameter

SAR(Synthetic Aperture Radar) images' registration is an important process for generating DEM using SAR interferometry technique,while coarse registration is the basic step of SAR images' registration.This paper proposes a new automatic SAR images coarse registration method based on the geographical coordinates(latitude and longitude) parameter.This method makes use of the parameters of SAR images' geographical coordinates,using the polynomial to fit the variance of pixels' geographical coordinates along with their image coordinates in the master and the slave images,first gets the geographical coordinates of master SAR image's central pixel, and then finds the pixel in the slave SAR image whose geographical coordinates equal this geographical coordinates of central pixel in the master SAR image.The offset of coarse registration is the difference between image coordinates of this pixel in the slave image and image coordinates of central pixel in the master image.Results using real SAR data show that the proposed method is both quick and efficient.