In-orbit monitoring method for 6 freedom change between space three-linear array CCD camera lens

Abstract

The invention relates to an on-line monitoring method of the change of six freedom degrees between the lenses of an astronautical CCD camera with three linear arrays. A laser emitting and receiving device which comprises a laser source, an optical fibre coupler, a laser aligner, a semi-transparent semi-reflecting mirror and a first area array CCD camera is rigidly fixed on a camera lens A, and a laser reflecting and receiving device which comprises a plane mirror, a second area array CCD camera and a third area array CCD camera is rigidly fixed on the a camera lens B. The optical fibre coupler divides lasers emitted from the laser source into three paths, and then, the lasers are respectively aligned by the laser aligner and are output, wherein two paths of the lasers are respectively and directly projected on the two area array CCD cameras of the laser reflecting and receiving device, and the other path of the lasers are reflected on the single area array CCD camera of the laser emitting and receiving device. The change of three rotating freedom degrees and three translational freedom degrees between the lenses of the astronautical camera is solved through the change of facula positions on each area array CCD camera. In the invention, a non-contact measurement method is adopted, the structure of the astronautical camera can not be changed, the processes of installation and adjustment are convenient, the structure is compact, and the on-line operation mode can be achieved.

Description

technical field [0001] The invention belongs to the technical field of aerospace satellite photogrammetry, and relates to a method for on-orbit monitoring of 6-degree-of-freedom changes between lenses of aerospace three-line array CCD cameras. Background technique [0002] The relative positional relationship between the lenses of the aerospace three-line array CCD camera is an important parameter. The relative 6 degrees of freedom change between lenses includes 3 translational degrees of freedom and 3 rotational degrees of freedom, which need to be measured separately. At present, the relative positional relationship between the three-line-array CCD camera lenses in the aerospace industry can only be determined by precise verification in the ground laboratory before the satellite is launched. This leads to changes in the relative positional relationship between the lenses of the aerospace three-line array CCD camera, which leads to changes in the azimuth elements in the ca...

AI Technical Summary

Problems solved by technology

However, this method is very complicated and takes a long time. It is suitable for regular inspection of the accuracy of the angle between the camera lenses. It cannot be monitored in real time, and it cannot meet the requirements of global satellite photogrammetry without ground control points.

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