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In-orbit absolute radiation calibration method for simplifying radiation transfer calculation based on multi-energy-level targets

An absolute radiation calibration and radiation transfer technology, which is applied in the field of on-orbit absolute radiation calibration based on multi-level target simplified radiation transfer calculation, can solve the problems that the actual situation and assumptions are difficult to match, and achieve the effect of high-precision calibration

Inactive Publication Date: 2018-06-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

South Dakota State University (South Dakota State University) has realized the multi-level radiometric calibration of optical remote sensors based on artificial targets in the full dynamic range. Atmospheric point spread function, ambient reflectivity and other assumptions, in the case of complex background, the actual situation and assumptions are difficult to match
The calculation error caused by the model assumption is as high as more than 20% in the blue band

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  • In-orbit absolute radiation calibration method for simplifying radiation transfer calculation based on multi-energy-level targets
  • In-orbit absolute radiation calibration method for simplifying radiation transfer calculation based on multi-energy-level targets
  • In-orbit absolute radiation calibration method for simplifying radiation transfer calculation based on multi-energy-level targets

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Embodiment Construction

[0045] Such as figure 1 , 2 , an on-orbit absolute radiation calibration method based on multi-level target simplified radiation transfer calculation, the specific content is as follows:

[0046] The radiation at the entrance pupil of the optical remote sensor is mainly composed of three parts: atmospheric radiation, target reflected radiation, and surrounding background radiation, as follows figure 1 Shown: According to the radiation transfer model, the entrance pupil radiance of the optical remote sensor in a complex environment can be expressed as:

[0047]

[0048] where E s (λ) is the spectral irradiance outside the atmosphere, μ s is the cosine of the solar zenith angle, T gas (θ s ,θ ν ,λ) is the absorption gas permeability, ρ a(λ) is the inherent reflectance of the atmosphere, τ(λ) is the optical thickness of the atmosphere, S(λ) is the albedo of the atmosphere, t d (θ s ,λ) is the sun-ground diffuse transmittance, ρ B (λ) is the reflectivity of the surr...

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Abstract

The invention discloses an in-orbit absolute radiation calibration method for simplifying radiation transfer calculation based on multi-energy-level targets. According to the invention, a gray-scale target (target plate), a reflector, an active light source and other multi-energy-level targets are used as references, and separation of target radiation from atmospheric path radiation and surface-atmosphere coupled radiation is calculated by using linear regression; and the in-orbit absolute radiation calibration of optical remote sensors is realized through a combination of measurement of the optical thickness of on-site atmosphere, a ratio of diffusion to total irradiance (needed if the target is a diffusion target) and the energy of the multi-energy-level targets, and calculation of the transmittance of atmospheric absorption gases. The in-orbit absolute radiation calibration method of the invention uses data actually measured on the ground as main data and does not depend on radiation transfer calculation, so the influence of aerosol, atmosphere modes and other factors is reduced; and the in-orbit absolute radiation calibration method can realize full-dynamic-scope high-precisioncalibration of the optical remote sensors.

Description

technical field [0001] The invention relates to the field of optical remote sensing science and technology, in particular to an on-orbit absolute radiation calibration method based on simplified radiation transfer calculation of multi-energy level targets. Background technique [0002] Optical remote sensing has important application significance in the fields of land and resources survey, surveying and mapping, urban planning and military reconnaissance. Remote sensing data products such as biophysical parameters of the observed target are directly related to the radiation response of the remote sensor, so the accuracy of absolute radiometric calibration during the operation of the remote sensor directly affects the breadth and depth of its remote sensing data application. [0003] The laboratory calibration of the optical remote sensor before launch is the most comprehensive and accurate. However, due to the severe vibration during launch, the harsh environment of outer sp...

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Application Information

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IPC IPC(8): G01N21/17G01N21/25G01J3/28
CPCG01N21/17G01J3/2823G01N21/25G01N2021/1793G01N2021/1795
Inventor 陈洪耀张黎明李鑫徐伟伟司孝龙韩涛杨利峰
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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