ACCURATE METHOD FOR ESTIMATION WITH TOTAL AVAILABILITY OF THE LINE OF SIGHT OF A TELESCOPE ON BOARD AN EARTH OBSERVATION SATELLITE

摘要

The invention relates to a method for accurately estimating the line of sight of a part of a satellite borne telescope and an earth observation satellite, which comprises the following three steps.;In the first stage (104), SCAO periodically and absolutely measures the noise attitude (104) of the platform (4).;Then, in a second step (106) in parallel with the first step (104), a low-noise differential measurement for periodically determining the line of sight of the telescope is performed from an image with a common and non-uniform area acquired by at least one imaging detector.;Then, in the third step (108), the, By comparing the high-precision relative differential measurement of the telescope line of sight with the absolute measurement of the satellite attitude, the filter periodically estimates the angle deviation between the actual line of sight of the telescope and the actual attitude of the satellite defined by the SCAO reference trihedron direction. Platform.