Dynamic MTF estimate of the optical imager onboard Alsat-1B satellite

Abstract

Unwanted movements during image recording usually cause problems for optical imaging systems onboard Earth Observation satellites. The major effect of these movements is the degradation of image quality by smearing and distortion. The aim of this paper is to provide estimates of the blur-caused MTF of an isolated CCD detector element as a result of linear motion to evaluate the impact of such blur, that may be experienced operationally, on the whole system MTF of the Alsat-1B imager. The estimates are made on ground prior to launch and include effects caused by linear motion of the spacecraft relative to the earth and exclude effects of motion caused by mechanical vibration or platform drift. Those estimates are of great importance as part of system level analysis which can help restoring the degraded image.