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Radiometric calibration method based on on-orbit benchmark satellite

A radiometric calibration and reference star technology, applied to measuring devices, instruments, etc., can solve the problem of low calibration accuracy and achieve the effect of improving probability and accuracy

Active Publication Date: 2017-05-10
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

[0005] The technical solution of the present invention is to provide an on-orbit absolute calibration method based on reference stars for the current situation that the existing on-orbit absolute calibration accuracy is not high. The transfer link model gets rid of the atmospheric transmission path, and can obtain accurate entrance pupil radiance, and then obtain accurate absolute calibration coefficients

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  • Radiometric calibration method based on on-orbit benchmark satellite
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Embodiment Construction

[0058] like figure 1 Shown, the method of the present invention is concretely realized as follows:

[0059] (1) Establish the space position motion equation of the sun in the geocentric coordinate system;

[0060] 1) For the position of the sun in the geocentric coordinate system, first convert the given date into a Julian century number

[0061] T=(JD-2451545.0) / 36525

[0062] JD=int(365.25·(y+4716))+int(30.6001·(m+1))+d-int(y / 100)+int(int(y / 100) / 4)-1522.5

[0063] In the formula, T represents the Julian century number, JD represents the Julian day number, y represents the year number, m represents the month number, and d represents the date number

[0064] 2) The relative trajectory of the sun relative to the center of the earth is similar to an ellipse. The eccentricity e of the ellipse, the mean anomaly angle M, the geometric flat elliptic longitude Lo of the sun, the solar center difference C, and the true anomaly angle V are expressed as follows:

[0065] e=0.0167086...

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Abstract

Aimed at the current situation of poor on-orbit absolute radiometric calibration precision, the invention provides an on-orbit absolute radiometric calibration method based on a benchmark satellite. Sunlight with appropriate intensity is reflected onto a to-be-calibrated remote sensor by a diffuse reflection plate on a benchmark satellite, the influence of atmospheric conditions on a radiation transfer path is got rid of, an accurate apparent radiance is obtained, and thereby an accurate absolute calibration coefficient is obtained. In the invention, the sun, the benchmark satellite and the to-be-calibrated remote sensor are integrated into a geocentric coordinate system, so that the distance between each two of the three and the incidence angle and emergence angle of sunlight on the surface of the diffuse reflection plate on the benchmark satellite can be conveniently obtained, a radiation transfer link model from the sun to the benchmark satellite and to the to-be-calibrated remote sensor is created, and finally, calibration is complete.

Description

technical field [0001] The invention belongs to the field of on-orbit absolute radiation calibration and specifically designs an on-orbit absolute radiation calibration method based on a reference star. Background technique [0002] With the increasing application requirements of remote sensing data, the demand for further improving the accuracy of quantitative application of remote sensing data has been generally recognized. The importance of radiometric calibration of remote sensors has gradually been widely recognized, and the requirements for radiometric calibration accuracy are also obvious . [0003] Due to the influence of the atmospheric model and the influence of the surface reflectance on the site calibration method, it is difficult to improve the calibration accuracy; using the moon as the calibration light source and star calibration has not yet mastered the reflection spectrum characteristics of the moon's surface, so the moon cannot be used for absolute radiati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 陈轩谭伟赵占平齐文雯刘薇李方琦李岩高慧婷周楠
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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