Method for radiometric calibration of SAR sensors

摘要

A method for radiometric calibration of SAR radar sensors comprises the following steps:
- selecting from a plurality of images co-recorded by said sensors pixels corresponding to resolution cells on earth comprising targets that maintain the radiometric features unaltered over time, said selecting occurring on a portion of image common to said N images and on the basis of the calculation of a stability index of said radiometric features;
- estimating calibrating constants, one for each image;
- using said calibrating constants to compensate each of said images, obtaining compensated images;
- repeating said estimating by using said compensated images until a convergence is reached, said convergence being defined as a stage of said repeating in which a further repeating does not involve significant variations in the estimation of said calibrating constants.