Focusing device and method for satellite remote sensing camera

Abstract

The invention provides a focusing device and method for a satellite remote sensing camera. The focusing device comprises a focusing ring assembly and a motion transmission assembly, wherein the focusing ring assembly and the motion transmission assembly are used for enabling a camera lens focusing ring to conduct small-step-length planar motion. As the focusing ring assembly and the motion transmission assembly which can achieve small-step-length planar motion in orbit are adopted in cooperation with each other, accurate small-range focusing of the camera lens focusing ring is achieved; when the focal plane is out of focus because a satellite is influenced by temperature variation of a space environment, the focal distance of the remote sensing camera can be accurately adjusted through the focusing device, and then clear imaging of the satellite remote sensing camera is achieved. The focusing device has the advantages of being simple in structure, convenient to operate, high in focusing precision and the like, and the excessive focusing problem is avoided.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a focusing device for a satellite remote sensing camera and a focusing method thereof. Background technique [0002] Satellites are subject to severe shocks and vibrations during launch. The space camera mounted on the satellite will change its optical interval due to shock and vibration, for example, the distance between the primary mirror and the secondary mirror will change, and the correction mirror will move in its axial direction. These changes will cause the relative displacement of the optical focusing plane and the detection plane of the CCD (Charge Coupled Device) camera. Changes in the radius of curvature, thickness, etc. of the on-orbit camera lens will eventually lead to defocusing of the focal plane of the on-orbit camera lens, which will seriously affect the imaging quality of the on-orbit CCD camera. [0003] The power transmission forms in traditional focusi...

AI Technical Summary

Problems solved by technology

[0004] 1) The assembly of the screw nut transmission device is cumbersome, and it is easy to get stuck between the screw and the nut when working on the rail;

[0005] 2) The size of the worm gear transmission is large, which is not suitable for the requirements of on-board devices;

[0006] 3) The machining accuracy of the cam curve of the cam transmission device is high, the processing is difficult, the cost is increased, and the probability of device instability is increased

However, this control method is complicated in technology and low in reliability, which greatly increases the difficulty of developing the micro-satellite focusing device.

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