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Method of on-track detection for MTF (modulation transfer function) of interference hyperspectral imager

A technology of hyperspectral imaging and detection methods, applied in the field of MTF on-orbit detection, can solve problems such as detection methods that have not yet been seen, and achieve the effect of taking into account characteristics and algorithm feasibility, reducing sensitivity and improving accuracy

Active Publication Date: 2012-09-26
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

At present, there are relatively mature on-orbit detection methods for the MTF of multispectral sensors, but for the MTF on-orbit detection methods of interferometric hyperspectral imagers, so far, there are no detection methods related to this aspect in domestic and foreign literature.

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  • Method of on-track detection for MTF (modulation transfer function) of interference hyperspectral imager
  • Method of on-track detection for MTF (modulation transfer function) of interference hyperspectral imager
  • Method of on-track detection for MTF (modulation transfer function) of interference hyperspectral imager

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings. Such as figure 1 Shown, the steps of the present invention are as follows:

[0026] (1) Read the interferometric data map of the hyperspectral imager, perform Fourier inverse transform on the interferometric data of the hyperspectral imager to obtain the spectral data map of the hyperspectral imager; calculate the hyperspectral image according to the formula ① according to the laboratory spectral calibration results Instrument spectral data;

[0027] B(λ)=Λ·I(Δ) ①

[0028] In the formula: Δ is the optical path difference of the coherent beam;

[0029] λ is the wavelength of the hyperspectral imager band;

[0030] I(Δ) corresponds to the intensity of the interferometric data of the hyperspectral imager;

[0031] B(λ) corresponds to the spectral data intensity of the hyperspectral imager;

[0032] Λ corresponds to the inverse Fourier transform coefficient matrix. ...

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Abstract

A method of on-track detection for MTF (modulation transfer function) of an interference hyperspectral imager includes: firstly, reading an interference data graph of the hyperspectral imager and subjecting interference data of the hyperspectral imager to discrete inverse discrete Fourier transformation to obtain a spectral data graph of the interference hyperspectral imager; secondly, selecting a 'knife-edge' image module from the spectral data graph of the hyperspectral imager and calculating proper effective wavebands of the MTF of the interference hyperspectral imager according to SNR (signal to noise ratio) of the image module; thirdly, extracting knife-edge points from the knife-edge image module in the effective waveband, and fitting the knife-edge points to form ESF (edge spread function); fourthly, subjecting the ESF to differential computing, fitting results of differential computing to obtain LSF (linear spread function), and subjecting the LSF to discrete Fourier transformation to obtain the effective wavebands of the MTF of the interference hyperspectral imager; and fifthly, averaging the effective wavebands of the MTF to finally obtain overall MTF of the interference hyperspectral imager.

Description

technical field [0001] The invention relates to an MTF on-orbit detection method of an interferometric hyperspectral imager, in particular to a spectral drift detection method of an environmental disaster reduction satellite hyperspectral imager. Background technique [0002] The interferometric hyperspectral imager has very high spectral resolution. It obtains rich spatial information, radiation information and spectral information of ground objects with nanoscale spectral resolution. image quality. [0003] During the imaging process of the interferometric hyperspectral imager, due to the influence of the atmosphere, the imaging quality will be degraded; and as the on-orbit time increases, the attenuation of the optics, detectors, and electronic subsystems in the imaging system will also cause the imaging The quality gradually degrades, reducing the usefulness of the information in the image. Therefore, it is very necessary to evaluate the imaging quality of interferomet...

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Application Information

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IPC IPC(8): G01J3/45
Inventor 王爱春傅俏燕闵祥军潘志强韩启金
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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