Calibration method of space-based sounding reference based on high-bandwidth gyro measurement

Abstract

The invention discloses a space-based detection reference calibration method based on high-bandwidth gyroscope measurement. The space-based detection reference calibration method comprises: real-timely measuring the relative change of detection reference, and reducing the heat deformation transmission path between on-board detection reference and satellite attitude reference; installing a high-bandwidth gyroscope on the back portion of a scanning mirror; installing an optical fiber gyroscope on a base positioned at a camera light machine main body and close to a detector position, installing a star sensor on a base positioned outside the camera light machine main body and close to the detector, and measuring the reference vector of the detector in an inertial coordinate system in a combined manner through the combination of the star sensor and the gyroscope; and obtaining an initial reference vector according to the satellite attitude and the rotation angle parameter of the scanning mirror, calculating the change of the space-based detection reference according to the measured data of the high-bandwidth gyroscope and the satellite attitude data, and calibrating the detection reference by using a fixed star calibration object. According to the present invention, with the space-based detection reference calibration method, the on-orbit calibration precision of the space-based detection reference can be effectively improved, the index requirement can be met, and the accuracy of more than 50%can be ensured.

Description

technical field [0001] The invention relates to the field of satellite space remote sensing, in particular to a space-based detection benchmark calibration method based on high-bandwidth gyroscope measurement. Background technique [0002] Satellites perform remote sensing and space target detection tasks in orbit, and the calibration accuracy of the detection reference directly determines the positioning accuracy of the detection target. For on-board cameras using scanning imaging, the space-based detection reference is related to the rotation angle of the on-board camera's scanning mirror, the attitude and orbital position of the satellite. Since the reference of the satellite platform is the star sensor, the on-orbit reference of the space-based detection must establish contact with the star sensor. Geostationary Orbiting Environmental Services (GOES) series satellites and other foreign remote sensing satellites' space-based detection reference calibration adopts the met...

AI Technical Summary

Problems solved by technology

This method needs to solve the calibration problem that the star body of the satellite is heated unevenly under different solar illumination conditions, which causes the structural deformation of the scanning mirror and its mounting surface inside the camera on the star, the whole camera and its mounting surface, the star sensor and its mounting bracket.

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