Calculation and Analysis of MTF of On-Orbit Satellite Images Based on Knife-Edge Method.

Abstract: Modulation transfer function (MTF) is more authoritative in evaluating the performance of optical imaging system. Therefore, measuring MTF directly from the information of remote sensing image is an important method to monitor on-orbit satellites. This paper chooses knife-method which is applicable for MTF measurement of on-orbit satellites. In the process of calculating MTF, a new-type nonlinear least squares iteration algorithm, instead of simulated annealing algorithm, is selected to approach ESF using the Fermi function. Simulation results show that the new algorithm has greater superiority in the precision and speed. Furthermore, on the basis of implementation of MTF measurement, this paper studies the influence of edge height, angle, and gray contrast on MTF, and tests the precision of the method. [Copyright &y& Elsevier]