Satellite-to-ground camera imaging system for direction measurement of optical remote sensing satellite

Abstract

The invention provides a satellite-to-ground camera imaging system for high-precision direction measurement of an optical remote sensing satellite, a field of view of a satellite-to-ground camera is divided into an over-the-sky field of view and an over-the-ground field of view, and the two fields of view are in a common-optical-path integrated design, so that a visual axis relation between an over-the-sky imaging module and an over-the-ground imaging module is stable; therefore, through common-path imaging on the sky and the ground and matching with other position resolving algorithms, high-precision calibration, positioning and even surveying and mapping tasks on the ground object position can be completed; based on the stable visual axis relation between a satellite-to-ground camera to the over-the-sky imaging module and the over-the-ground imaging module, the optical remote sensing satellite direction correction system firstly determines the visual axis direction of the to-the-ground imaging module in combination with the star map orientation acquired by the over-the-sky imaging module; and image matching is carried out according to image data obtained by ground imaging of the main camera and ground imaging data of the satellite-to-ground camera so as to further correct errors of the visual axis pointing of the main camera, so that the visual axis pointing of the main camera is calculated with high precision, and the surveying and mapping precision of the main camera is improved.

Description

technical field [0001] The invention belongs to the technical field of remote sensing satellite imaging, in particular to a satellite-ground camera imaging system for high-precision pointing measurement of optical remote sensing satellites. Background technique [0002] In the traditional method of using star sensor or star camera for optical remote sensing satellite pointing measurement, the star sensor or star camera boresight is fixedly connected with the main camera (load) structure, and the distance between the main camera and the star sensor boresight is determined in the ground laboratory. When working in orbit, it is assumed that the relative relationship is fixed, and on this basis, the camera pointing, etc. are measured and calibrated. In fact, due to the influence of material, humidity, weight changes, and satellite launch process and on-orbit operating environment changes, the relative relationship will inevitably change, becoming the largest and difficult to mea...

AI Technical Summary

Problems solved by technology

The mathematical model of this process is complex, and the model parameters are constantly changing, which limits the calculation accuracy of pointing, especially when imaging in uncontrolled areas (overseas), the pointing accuracy is difficult to guarantee

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