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Registering method used for correcting wavelength drift of satellite hyperspectral data

A technology of wavelength shifting and hyperspectral, which is applied in absorption/scintillation/reflection spectroscopy, spectrum investigation, etc., can solve the problems of reduced accuracy of target gas detection, improve application value, reduce the influence of interference factors, improve accuracy and The effect of convergence speed

Active Publication Date: 2017-04-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a registration method for correcting the wavelength drift in satellite hyperspectral data, so as to solve the problem that the accuracy of target gas detection is reduced due to the unavoidable wavelength drift in existing satellite hyperspectral data

Method used

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  • Registering method used for correcting wavelength drift of satellite hyperspectral data
  • Registering method used for correcting wavelength drift of satellite hyperspectral data
  • Registering method used for correcting wavelength drift of satellite hyperspectral data

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Embodiment Construction

[0036] Such as figure 1As shown in , a registration method for correcting wavelength drift in satellite hyperspectral data includes the following steps:

[0037] (1) According to the geographical location and observation time of satellite observation points, obtain the surface and atmospheric model data of the NCEP reanalysis data of the US National Center for Environmental Prediction, the surface reflectance and aerosol products of the medium resolution imaging spectrometer MODIS; combine the observation geometric conditions and The geometric conditions of the sun, as well as the spectral range and line shape function of the medium resolution imaging spectrometer MODIS, use the atmospheric radiative transfer model SCIATRAN to calculate and obtain the simulation results of satellite observations;

[0038] (2) Obtain ultra-high-resolution spectral data from satellite observations as a benchmark, use differential absorption spectroscopy DOAS technology, combined with the least s...

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Abstract

The invention discloses a registering method used for correcting wavelength drift of satellite hyperspectral data. The method is mainly used for carrying out wavelength registering on the satellite hyperspectral data with wavelength drift. The method is based on simulation reference data consistent with the baseline characteristics of the satellite spectral data. The method comprises the steps that the reference peak position of a satellite spectrum and a simulation spectrum is positioned by a trigonometric function of specific spectral resolution; initial registering is carried out; and through accurate inversion of a wavelength correction factor, a wavelength registering model is combined for fine registering. According to the invention, the method can automatically, accurately, stably and quickly acquire the wavelength drift of the satellite hyperspectral data without manual intervention or constructing a lookup table; the wavelength error of satellite observation is corrected; and the application value of the hyperspectral data in the fields of high precision atmospheric gas component detection and the like is improved.

Description

technical field [0001] The invention relates to the technical field of satellite spectral data preprocessing, in particular to a registration method for correcting wavelength drift existing in satellite hyperspectral data. Background technique [0002] During satellite launch and in-orbit operation, due to the influence of sudden environmental changes and instrument performance aging, the hyperspectral data inevitably has wavelength drift. Wavelength drift will lead to a mismatch between measured information and simulated information, which seriously hinders the application of hyperspectral data in high-precision detection of atmospheric gas components. Accurately obtaining the wavelength drift of satellite hyperspectral data and effectively correcting it is the key to ensuring the correctness of satellite remote sensing data. Prerequisites for the application. [0003] The existing spectral registration methods are mainly designed for low-resolution spectral data, and ther...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/42
CPCG01J3/42
Inventor 叶函函王先华吴军蒋芸李志伟施海亮熊伟
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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