Multispectral co-phase error detection method based on pupil space modulation

Abstract

The invention discloses a multispectral co-phase error detection method based on pupil spatial modulation. The method can be used for co-phase error detection in a spliced telescope system. The methodcomprises the following steps: selecting a reference sub-pupil, and acquiring a point spread function of the reference sub-pupil, a point spread function of the remaining sub-pupil and a point spreadfunction of a system; solving partial co-phase error distribution of the system under the wavelength by adopting a reverse deconvolution method according to the obtained three point spread functions;changing the wavelength for multiple times, and solving the corresponding partial in-phase error distribution, and finally calculating the overall in-phase error of the system by using a multi-spectrum synthesis algorithm. According to the method, there is no need to additionally add a reference pupil on a synthetic aperture surface, the structure is simple and the efficiency is high; meanwhile,the phase difference is processed by adopting multiple wavelengths, so the 2*pi fuzzy influence can be effectively inhibited, and the detection range is enlarged.

Description

technical field [0001] The invention belongs to the field of sparse optical synthetic apertures, and in particular relates to a multispectrum common-phase error detection method based on pupil space modulation of a sparse optical synthetic aperture imaging system. Background technique [0002] In astrophysics, telescopes have always played a vital role. In modern times, with the change of the observation object and observation distance, the requirements for the resolution and light-gathering ability of the telescope are gradually increasing. However, both of these two important indicators depend on the increase of the aperture of the telescope. However, if a single primary mirror is used to manufacture a large-aperture telescope, it will face the limitations of many factors such as material cost, processing technology, and the increase in aberration caused by the increase in the weight of the primary mirror. . Sparse optical synthetic aperture imaging technology is a new t...

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Problems solved by technology

Compared with the methods above, the multi-wavelength phase-shift modulation method has the advantages of high real-time performance and a large range of detectable translation errors, but in this method, the introduction of additional small apertures will also affect the final imaging quality of the system, although its impact can be However, it also brings complexity to the common phase error detection of the system

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