A Method for Correcting Misalignment Errors of Large Aperture and Large Field of View Telescopes

Abstract

The invention relates to a method for correcting misalignment errors of a telescope with a large aperture and a large field of view. The imaging spots of each field of view are used for target extraction and field of view matching; (3) Calculate the image definition function of the under-sampled imaging spots of each field of view in the initial misalignment state; (4) Use the optimization algorithm to calculate the new secondary mirror position, and pass The six-degree-of-freedom driver changes the position of the secondary mirror; (5) collects the far-field undersampled imaging spots of each field of view again, and performs target extraction and field of view matching, and calculates the image definition function of each field of view spot; (6) judges and corrects Whether the result satisfies the termination condition, if so, the calibration process ends, otherwise, repeat steps (4)-(6). The present invention can be directly based on the image definition function of far-field under-sampling imaging spot, and can realize the online, closed-loop, high-precision correction process for the misalignment error of large-aperture and large-field-of-view telescopes by using an optimization algorithm.

Description

technical field [0001] The invention relates to the field of integrated installation and adjustment of a telescope system, in particular to a large-diameter and large-field-of-view telescope misalignment error correction method based on a far-field undersampling imaging spot image clarity function. This method is suitable for online tuning of telescope optical systems with undersampled imaging spots. Background technique [0002] In order to detect farther and darker targets, telescope apertures and fields of view have continued to increase. However, during the working process of the telescope, due to the influence of gravity, wind load, vibration, temperature change and other factors, the relative position of each optical mirror surface will change, and the misalignment error will be introduced into the system, making the imaging quality unable to meet the needs of use. At present, the online correction technology of system offset error of large-diameter and large-field te...

AI Technical Summary

Problems solved by technology

Due to the cumbersome implementation process and complex algorithm, the undersampling image reconstruction technology cannot be directly applied to the online and closed-loop correction process of the telescope misalignment error

At present, the misalignment error correction technology of large aperture and large field of view telescope mainly adopts direct wavefront detection method or image-based wavefront detection method such as phase difference method (Phase Diversity, PD), phase recovery method (Phase Retrieval, PR), etc. , but it is necessary to add a wavefront detection device to the optical system, which increases the complexity of the system, and requires wavefront measurement and reconstruction, resulting in a complicated calculation process

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