An Absolute Radiometric Calibration Method for Optical Remote Sensing Satellites Based on Space Lambertian Sphere

An absolute radiometric calibration and optical remote sensing technology, applied in the field of remote sensing satellite radiometric calibration, can solve problems such as increasing the operating burden of the entire satellite system, the impact of component calibration work, and satellite exhaust pollution, etc. The effect of reducing the burden and improving the calibration accuracy

Active Publication Date: 2018-06-01
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

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  • An Absolute Radiometric Calibration Method for Optical Remote Sensing Satellites Based on Space Lambertian Sphere
  • An Absolute Radiometric Calibration Method for Optical Remote Sensing Satellites Based on Space Lambertian Sphere
  • An Absolute Radiometric Calibration Method for Optical Remote Sensing Satellites Based on Space Lambertian Sphere

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Embodiment Construction

[0025] Such as 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 ...

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Abstract

An absolute radiometric calibration method for optical remote sensing satellites based on a space Lambertian sphere. By deploying a space Lambertian sphere in space, the solar radiation attenuated to a suitable range is directly introduced into the satellite remote sensor. Determine the background signal by imaging the deep space background through satellite attitude maneuvering; use satellite tool software to calculate the time period that meets the calibration conditions, and select the imaging time point, and determine the space Lambertian sphere reflection signal through satellite attitude maneuvering to image the space Lambertian sphere, From this, the irradiance at the entrance pupil of the remote sensor at the imaging moment is calculated, and the absolute radiation calibration coefficient of a single point is determined by acquiring multiple sets of data. The method of the invention avoids the influence of atmospheric conditions and ground target characteristics, establishes a unified space optical radiation reference, meets the radiation calibration requirements of full optical path, full aperture, and solar spectral distribution matching, and can realize normalized monitoring of satellite remote sensors .

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...

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Application Information

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Patent Type & Authority Patents(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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