Optical precision tracking detector based on double pyramidal rectangular pyramids

Abstract

The invention discloses an optical precision tracking detector based on a double pyramidal rectangular pyramids, which comprises an imaging lens, a pyramidal rectangular pyramid with an opening in thecenter thereof, a dynamic range matching lens, a precision matching lens, a light spot amplification lens, a dynamic range light intensity detector, a precision pyramidal rectangular pyramid and a precision light intensity detector, wherein the traditional optical precision tracking detector based on the pyramidal rectangular pyramid is added with the centrally-opened pyramidal rectangular pyramid, the dynamic range matching lens and the dynamic range light intensity detector in the hardware manner to increase the dynamic range of the detection in the oblique direction of wavefront tilt, andin the software manner, the nested four quadrant light spot centroid algorithm is used for calculating the centroid of the light spot so as to restore the tilt angle or the tilt direction of target wavefront. The light intensity detector of the optical precision tracking detector has flexible selectivity, high detection precision, large dynamic range of the detection in the oblique direction of wavefront tilt, simple algorithm for restoring the wavefront tilt and easily-realized process, thus providing conditions for the detection of weak light wavefront at high accuracy and high frame frequency.

Description

technical field [0001] The invention relates to an optical precision tracking detector based on a pyramidal pyramid, in particular to an optical precision tracking detector based on a pyramidal pyramid with the characteristics of large dynamic range and high precision, which can be applied in satellite-to-earth optical communication. Background technique [0002] Satellite-to-ground optical communication refers to the use of laser beams as carriers to establish optical communication links between satellites and the ground. Compared with the microwave communication commonly used at present, the satellite-ground optical communication has the advantages of large communication capacity, small system size and weight, strong confidentiality, less electromagnetic interference and wide frequency bandwidth. Therefore, many countries have invested huge financial, manpower and material resources in the research of star-to-earth optical communication. Among them, Japan used the ETS-VI ...

AI Technical Summary

Problems solved by technology

However, the traditional optical precision tracking detectors based on pyramidal pyramids are limited by the processing technology of pyramidal pyramids. The diameter of the light spot irradiated on the pyramidal pyramids must be large to ensure sufficient detection accuracy, and the target surface area of ​​the light intensity detector Yes, the larger the diameter of the spot, the smaller the dynamic range of the detector, so the traditional optical precision tracking detector based on the pyramidal pyramid has the problem of not being able to balance the dynamic range and detection accuracy

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