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On-orbit absolute radiation calibration method for optical remote sensor based on reflector array

An absolute radiation calibration, optical remote sensor technology, applied in the field of optical remote sensing science, can solve the problems of limited stellar database, high requirements for maneuverability and reliability, limited number of large-area uniform fields, etc., to achieve full dynamic range, The effect of flat terrain and uniform ground

Active Publication Date: 2018-06-05
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

The number of large-area uniform fields that meet the calibration requirements is limited, and the star-based calibration method requires high maneuverability and reliability of the platform, which has certain risks, and the suitable star database is limited

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  • On-orbit absolute radiation calibration method for optical remote sensor based on reflector array
  • On-orbit absolute radiation calibration method for optical remote sensor based on reflector array
  • On-orbit absolute radiation calibration method for optical remote sensor based on reflector array

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Embodiment Construction

[0052] An optical remote sensor based on mirror array on-orbit absolute radiometric calibration method, the specific content is as follows:

[0053] The radiance at the entrance pupil of the mid-infrared band optical remote sensor is expressed as:

[0054] L(λ)=L ground,total (λ)τ ↑ (λ)+L atmsphere,T (λ)+L atmsphere,scatt (λ)

[0055] L ground,total (λ)=ε(λ)B(T,λ)+(1-ε(λ))E diffuse (λ) / π+ρ(λ)E dir cos(θ solar ) / π (1)

[0056] In the above formula, L ground,total (λ) is the radiance produced by the ground target, τ ↑ (λ) is the atmospheric transmittance of the target-remote sensor path, L atmsphere,T (λ) is the radiance produced by atmospheric radiation, L atmsphere,scatt (λ) is the radiance produced by atmospheric scattering;

[0057] For the plane-parallel atmosphere, the reflector targets with different energy levels reflect the direct sunlight at the same time, the emitted radiation of the mirror surface, the scattering and thermal radiation of the atmosphere a...

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Abstract

The invention discloses an on-orbit absolute radiation calibration method for an optical sensor based on a reflector array, which takes the reflector array as a reference target to separate target reflection radiation from atmospheric path radiation, earth-atmosphere coupling radiation and ground object thermal radiation by using linear regressive calculation. On-orbit absolute radiation calibration for a middle-infrared band optical remote sensor through measuring the field atmospheric optical thickness, temperature, humidity and pressure profile and reflector specular reflectance and combining calculation for the atmospheric absorption gas transmission rate. The on-orbit absolute radiation calibration technology for the middle-infrared band optical remote sensor mainly relies on ground measured data, and does not depend on radiation transmission calculation, thereby reducing influences of factors such as an aerosol and an atmospheric mode. The calibration technology can realize full-dynamic-range and high precision calibration for the middle-infrared band optical remote sensor.

Description

technical field [0001] The invention relates to the field of optical remote sensing science and technology, in particular to an on-orbit absolute radiometric calibration method for an optical remote sensor based on a mirror array. Background technique [0002] Optical remote sensing in the mid-infrared band has important application significance in the fields of forest fire monitoring, target recognition and tracking, and military reconnaissance. The parameters of remote sensing data products such as the temperature radiation of the observation target are directly related to the radiation response of the remote sensor, so the accuracy of the absolute radiation 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 enviro...

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Application Information

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IPC IPC(8): G01J5/00G01C25/00
CPCG01C25/00G01J5/00G01J2005/0077G01J5/80
Inventor 陈洪耀张黎明徐伟伟李鑫
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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