Modulation transfer function (MTF) in-orbit measuring method for gazing satellite area array CCD camera

Abstract

The invention relates to a modulation transfer function (MTF) in-orbit measuring method for a gazing satellite area array CCD camera. The method is characterized in that an end-to-end point spread function model is established between point-source distribution and image distribution, point source is designed and laid; point spread function value of each image element in a point source zone is calculated, and then the point spread function parameter of the area array CCD camera can be obtained by using minimum norm solution, furthermore an optical transfer function can be obtained; finally, the optical transfer function is delivered and is the modulation transfer function, a first modulation transfer function value is taken as a reference for normalization processing, the modulation transfer function on any space direction theta can be obtained through transformation of coordinates; and the modulation transfer function at Nyquist frequency on any space direction theta is taken as a MTF index evaluate value of the gazing satellite area array CCD camera. The in-orbit measuring method solves the technical problem of MTF no in-orbit measuring of the gazing satellite area array CCD camera in background technology.

Description

technical field [0001] The invention relates to an on-orbit detection method for MTF of a staring satellite area array CCD camera, in particular to an MTF detection method for a geosynchronous geostationary orbit satellite area array camera. Background technique [0002] Staring satellites can continuously observe the phenomena in the field of view in real time and at fixed points, and can also directly customize continuous observations according to user needs. Its flexible and continuous observation methods can obtain more information about "interesting" than traditional earth observation satellites. The dynamic information of the target area". With the improvement of the sensitivity and resolution of the staring satellite area array CCD camera, the continuous high-precision spatial information, radiation information and spectral information of ground objects obtained by it will have a very wide application field, and the application value of this information will depend mo...

AI Technical Summary

Problems solved by technology

At present, for the MTF of linear array CCD cameras, there are many on-orbit detection methods such as contrast method, edge method and pulse method, but since the area array CCD photoelectric receiving array is a discrete acquisition device greatly affected by space and probe coupling , its optical transfer function (OTF) does not satisfy the premise of linear shift invariance, which makes the more mature MTF on-orbit test method of linear array CCD cameras unable to be directly applied to the MTF on-orbit detection of staring satellite area array CCD cameras

And because the remote sensing application of the staring satellite area array CCD camera started relatively late, so far, there is no detection method related to this aspect in the literature that can be consulted.

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