Solar sail spread structure dynamic characteristic in-orbit identification method based on binocular vision measurement

Abstract

The invention discloses a solar sail spread structure dynamic characteristic in-orbit identification method based on binocular vision measurement in order to solve the technical problem that the existing solar sail spread structure dynamic characteristic in-orbit identification method has small field of view for single measurement and is difficult to implement. The technical scheme is as follows: two cameras are used as vision sensors, vibration displacement information of a structure is extracted directly from images by use of image processing, digital image correlation, sub-pixel positioning and other methods, the dynamic characteristics of the structure are acquired in real time through an operational modal analysis technology, and thus, in-orbit identification of the dynamic characteristics of the structure is realized, and high identification precision is achieved. The cameras are fixed on a camera support fixedly connected with a solar sail spacecraft structure, and the structure of the whole sail surface can be monitored in an all-round way by finely tuning the locations and directions of the camera lenses. The method is easy to implement.

Description

Technical field [0001] The invention relates to an on-orbit identification method for the dynamic characteristics of a solar sail deployment structure, in particular to an on-orbit identification method for the dynamic characteristics of a solar sail deployment structure based on binocular vision measurement. Background technique [0002] The solar sail spacecraft is a large-scale thin-film deployment spacecraft composed of a large-area sail membrane and a supporting structure. It has the characteristics of light weight, large flexibility and low damping. The structural dynamic characteristics of such large flexible structures are identified and in-orbited. It is of great significance to realize structural health monitoring on this basis. [0003] The document "Vibration Estimation of Flexible Space Structures using RangeImaging Sensors "The International Journal of Robotics Research" 2006, No. 25, pages 1001-2023" discloses a flexible structure for measuring space on orbit using a...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing on-orbit identification method of the dynamic characteristics of the solar sail deployment structure, the field of view of a single measurement is small and difficult to achieve, the present invention provides an on-orbit identification method of the dynamic characteristics of the solar sail deployment structure based on binocular vision measurement

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