High-precision automatic calibration method for point source reference target

Abstract

The invention provides a high-precision automatic calibration method for a point source reference target, and relates to the field of optical remote sensing satellite on-orbit site point source reference target calibration. The high-precision automatic calibration method for the point source reference target comprises the following steps: observing a sun vector by using a camera observation method; rotating the center optical axis of the reflector to a direction consistent with the sun vector, and establishing a rotation transformation relation between an image plane of a camera observation image space coordinate system and an object plane of a local coordinate system; according to a coordinate rotation transformation relation, obtaining sun position parameters at different moments and different positions by using pitch and azimuth encoder rotation angle readings, sun image centroid coordinates and an astronomical algorithm; a multi-point observation equation is established, and a solving algorithm is optimized through the principle of a least square method to solve the model; based on the networked remote control capability, the pointing precision of a point source reference target tracking system is high, and the purposes of high-frequency and high-efficiency in-orbit radiation calibration and MTF detection of a high-spatial-resolution satellite are achieved.

Description

technical field [0001] The invention relates to the technical field of the calibration point light source reference target of an optical remote sensing satellite in orbit, in particular to a high-precision automatic calibration method for a point source reference target. Background technique [0002] Remote sensing is the use of detectors to record the electromagnetic wave characteristics of the target, and the quantitative processing of remote sensing information becomes effective information that can be used. With the further development of remote sensing quantitative application technology, on-orbit radiometric calibration is the key technology for quantitative application of remote sensing information. one. The point light source is placed in the radiation calibration site with reference to the target, and its geometric calibration is required to improve the pointing accuracy and be used in experiments such as radiation calibration and MTF detection. In order to achieve...

AI Technical Summary

Problems solved by technology

[0005] Existing technology has not yet established a high-precision automatic calibration model for convex mirrors, and it is difficult to meet the high-precision, high-frequency, and operational needs of existing high-resolution satellites

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