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Optical remote-sensing satellite absolute radiation scaling method based on spatial Lambert globe

An absolute radiation calibration and optical remote sensing technology, applied in the field of remote sensing satellite radiation calibration, can solve the problems of increasing the operating burden of the entire star system, the impact of component calibration work, satellite discharge pollution, etc., to achieve the correction of radiation response changes, Effects of reducing burden and improving calibration accuracy

Active Publication Date: 2016-02-24
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

However, limited by technical conditions, this method needs to install a separate solar diffuse reflector on the satellite itself. Its structural design is complex, it is easily polluted by satellite exhaust, and it increases the operating burden of the entire star system. In addition, this method has zero Component failure will have a huge impact on subsequent calibration work

Method used

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  • Optical remote-sensing satellite absolute radiation scaling method based on spatial Lambert globe
  • Optical remote-sensing satellite absolute radiation scaling method based on spatial Lambert globe
  • Optical remote-sensing satellite absolute radiation scaling method based on spatial Lambert globe

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Embodiment Construction

[0025] like figure 1 Shown, be the flow chart diagram of the inventive method, main steps are as follows:

[0026] (1) launch an artificial Lambertian sphere into space by means of carrier rocket launch or satellite release launch, the diameter and orbital position of the sphere meet the requirements of satellite calibration for signal energy;

[0027] The signal energy requirement of satellite calibration is that the satellite remote sensor receives the solar energy reflected by the sphere, and the signal voltage generated by the detector in the remote sensor is between 20% and 80% of the saturation signal voltage value of the detector.

[0028] The artificial Lambertian sphere is a uniform sphere with a surface close to Lambertian, and one example thereof is a barium sulfate Lambertian sphere, which is made by spraying. First, polish the surface of the uniform aluminum sphere with sandpaper, mix barium sulfate powder with milky white glue to make a semi-paste and evenly spr...

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Abstract

The invention relates to an optical remote-sensing satellite absolute radiation scaling method based on a spatial Lambert globe. The spatial Lambert globe is disposed in a space, and solar radiation which is attenuated to a proper range is directly led into a satellite remote sensor. A deep space background is imaged via satellite attitude maneuvering to determine a background signal; and satellite tool software is used to calculate a time period that satisfies the scaling condition, an imaging time point is selected, satellite attitude maneuvering is used to image the spatial Lambert globe and further to determine a reflection signal of the spatial Lambert globe, the irradiance of an entrance pupil position of the remote controller at the imaging time point is calculated, and the absolute radiation scaling coefficient of the single point is determined according to multiple groups of data. According to the method of the invention, influence of atmospheric condition and ground object characteristics is avoided, a unified spatial optical radiation reference is established, requirements for full-optical-path full-aperture radiation scaling that matches spectral distribution are met, and normalized monitoring for the satellite remote controller can be realized.

Description

technical field [0001] The invention belongs to the field of remote sensing satellite radiation calibration and relates to a method for normalized absolute calibration of the on-orbit radiation performance of space optical remote sensing satellites. Background technique [0002] With the deepening of remote sensing applications, quantitative remote sensing has become the focus of remote sensing applications, and the basis and premise of quantitative remote sensing is the radiometric calibration of remote sensors. The radiometric calibration of space remote sensors can be divided into laboratory calibration before launch and on-orbit calibration after launch. After the satellite is launched, with the influence of various factors such as the working environment and long-term working status, the calibration coefficient before launch may be changed. Therefore, the on-orbit calibration after launch is the key to ensure the reliability and accuracy of remote sensing data. The ess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/52G01J3/28
CPCG01J3/28G01J5/53
Inventor 王倩莹赵志伟高冀宋政吉徐鹏
Owner BEIJING INST OF SPACECRAFT SYST ENG
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