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On-orbit hyperspectral sensor radiation and spectral calibration parameter simultaneous inversion method

A spectral sensor and spectral calibration technology, which is applied in the field of simultaneous inversion of radiation and spectral calibration parameters of on-orbit hyperspectral sensors, can solve the problems of low accuracy of radiation calibration parameters and spectral calibration parameters

Active Publication Date: 2015-09-16
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for simultaneously inverting the radiation and spectral calibration parameters of hyperspectral sensors in orbit, so as to solve the problem of low accuracy of radiation calibration parameters and spectral calibration parameters obtained by calibration methods in the prior art The problem

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Embodiment 1

[0022] First, Embodiment 1 of the present invention provides a method for simultaneously inverting the radiation and spectral calibration parameters of an on-orbit hyperspectral sensor, see figure 1 , the method may include the following steps:

[0023] Step S102: Simulating the radiance of the top of the atmosphere with a resolution of 1 nanometer by using an atmospheric radiative transfer model.

[0024] Among them, the preset atmospheric temperature, humidity, aerosol visibility, and the angle of the on-orbit sensor and the angle of the sun are used as the driving data to drive the MODTRAN5 atmospheric radiation transfer model to simulate the radiance of the top of the atmosphere with a resolution of 1 nanometer. During the simulation process, the surface The reflectivity is set to a constant between 0.1-0.3.

[0025] Step S104: Calculate the entrance pupil radiance L1 of the sensor according to the spectral calibration parameters of the sensor measured in the laboratory b...

Embodiment 2

[0037] This embodiment is a further preferred method for simultaneously retrieving the radiation and spectral calibration parameters of the on-orbit hyperspectral sensor on the basis of the first embodiment, see figure 2 , the method may include the following steps:

[0038]Hyperspectral sensors are sensitive to changes in the central wavelength and band width due to their narrow band widths. Especially, changes in spectral calibration parameters around atmospheric absorption bands will be clearly reflected in spectral radiance. Radiometric and spectral calibration parameters are available. There are 4 parameters to be simultaneously inverted by this technology, namely, radiation calibration parameters: gain and offset, and spectral calibration parameters: central wavelength and band width.

[0039] (1) Set the typical atmospheric temperature, humidity, aerosol visibility, and the angle between the sensor and the sun to drive the MODTRAN5 atmospheric radiative transfer model...

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Abstract

The invention discloses an on-orbit hyperspectral sensor radiation and spectral calibration parameter simultaneous inversion method. The method comprises the steps that an atmospheric radiation transfer model is used to simulate the radiance of 1 nanometer resolution at the top of atmosphere; by taking a spectral calibration parameter before launching as an initial value, the spectral calibration parameter is constantly adjusted through an optimization algorithm, and corresponding sensor entrance pupil radiance L1 is calculated; the hyperspectral DN value image of a calibration parameter to be inversed is acquired; according to a radiation calibration parameter before launching and the hyperspectral DN value image, corresponding radiance L2 is calculated; derivative calculation is carried out on L1 and L2, and normalization, envelope removing and spectral angle calculation are respectively carried out on two derivation results; based on processing results, the optimization algorithm is used to carry out iterative comparison on difference between L1 and L2 until optimization meets preconditions, and the parameter to be inversed is an inversion result. According to the invention, simultaneous inversion of the on-orbit hyperspectral sensor radiation calibration parameter and the spectral calibration parameter is realized.

Description

technical field [0001] The invention relates to the technical field of remote sensing sensors, in particular to a method for simultaneously retrieving the radiation and spectral calibration parameters of an on-orbit hyperspectral sensor. Background technique [0002] The evaluation of performance indicators of on-orbit sensors is mainly used to monitor the performance indicators of hyperspectral sensors operating on orbit, including radiation calibration parameters (gain and offset) and spectral calibration parameters (central wavelength and band width), data Manufacturers or users produce and process remote sensing data according to the calibration results to ensure the accuracy and reliability of the remote sensing data itself. [0003] The jitter of the sensor platform (onboard or empty), instrument aging and changes in the surrounding environment will cause the radiation and spectral calibration parameters of the on-orbit sensor to change compared with the initial values...

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Application Information

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IPC IPC(8): G01S7/497
CPCG01S7/497
Inventor 王天星阎广建穆西晗任华忠刘耀开
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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