A frequency division method suitable for double-tilt mirror tracking system

Abstract

The present invention provides a frequency division method applicable to the tracking system of double tilting mirrors. According to the open-loop characteristics of the second tilting mirror, the second tilting mirror is determined at its response cut-off frequency; according to the parameter value K of the first integral operation, the calculation Obtain the correction bandwidth cut-off frequency of the second tilting mirror; select the parameter value of the second integral operation in turn according to the set selection rule, and calculate the frequency division frequency of the second tilting mirror based on the parameter value of the second integral operation selected; The correction bandwidth cut-off frequency and the frequency division frequency of the second tilting mirror are used to derive the theoretical travel range of the second tilting mirror; when it is judged that the theoretical travel range is within the set travel range, it will correspond to the parameter value K1 of the second integral operation selected, and The parameter value K of the first integral operation is used as the target frequency division parameter, and is used to set the dual-tilt mirror tracking system to achieve correction, so that the dual-tilt mirror tracking system can achieve the best effect on wavefront correction.

Description

Technical field[0001]The present invention relates to the field of adaptive optics, and more particularly to a frequency division method suitable for use in a double tilt mirror tracking system.Background technique[0002]Adaptive Optics (AO) is a technique for improving optical system performance using a deformable mirror correction because atmospheric jitter causes light wave wave. A telescope equipped with an adaptive optical system overcomes the influence of atmospheric jitter on imaging, significantly increases spatial resolution to approximately one quantity, reaches or approaches its theoretical diffraction limit. Adaptive Optics has gradually become widely used by major Assembly, and the road is opened for the next generation of larger diameter telescope.[0003]The tilt tracking system is an adaptive optics that can be lacking in the laser, and the role of tilt tracking is particularly important. Due to the inclination of the atmospheric wave, the error frequency is complex, an...

AI Technical Summary

Problems solved by technology

Due to the tilt of the atmospheric wave front, the error frequency components are complex, and a single tilting mirror cannot meet the requirements of correction bandwidth and dynamic range at the same time

In order to improve the bandwidth of the composite axis tracking system and meet the requirements of the laser guide system for the tilt tracking accuracy, a dual tilt mirror control system based on a double integral algorithm is proposed, which realizes the dual tilt mirror control with high and low frequency separation, and the large travel low frequency tilt mirror It is used to correct low-frequency errors, and the small-travel high-frequency tilting mirror is used to correct high-frequency errors. Compared with the single tilting mirror system, its correction performance has been significantly improved, but how to allocate the stroke and frequency makes the double tilting mirror control system The correction performance is optimal, but there is still a lack of relevant research

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