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An On-orbit Absolute Radiometric Calibration Method Based on Mirror Array for Optical Remote Sensor

An absolute radiometric calibration and mirror array technology, which is applied in the field of optical remote sensing science, can solve the problems of high mobility and reliability requirements, limited number of large-area uniform fields, and limited star database. Dynamic range, the effect of laying out the ground evenly

Active Publication Date: 2021-01-12
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

Method used

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  • An On-orbit Absolute Radiometric Calibration Method Based on Mirror Array for Optical Remote Sensor
  • An On-orbit Absolute Radiometric Calibration Method Based on Mirror Array for Optical Remote Sensor
  • An On-orbit Absolute Radiometric Calibration Method Based on Mirror Array for Optical Remote Sensor

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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 moment, the emitted radiation of the mirror surface, the scattering and thermal radiation of the atmosphere...

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Abstract

The invention discloses an on-orbit absolute radiation calibration method for an optical remote sensor based on a reflector array. The reflector array is used as a reference target, and the linear regression calculation is used to separate target reflected radiation from large-pass radiation, earth-atmosphere coupled radiation, and ground objects. Heat radiation. On-orbit absolute radiometric calibration of optical remote sensors in the mid-infrared band is achieved through on-site measurements of atmospheric optical thickness, temperature and humidity pressure profiles, and mirror reflectivity measurements combined with atmospheric absorption gas transmittance calculations. The mid-infrared band optical remote sensor on-orbit absolute radiation calibration technology of the present invention is based on ground measured data, does not rely on radiation transmission calculations, and reduces the influence of factors such as aerosols and atmospheric models. This calibration technology can realize mid-infrared Band optical remote sensor with full dynamic range and high precision calibration.

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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Patent Type & Authority Patents(China)
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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