A method and system for on-orbit absolute radiometric calibration of optical remote sensing satellites

A technology of absolute radiometric calibration and optical remote sensing, applied in the field of on-orbit absolute radiometric calibration methods and systems, it can solve the problems of high calculation errors, few opportunities, and singleness, and achieve the effect of reducing restrictions and requirements.

Active Publication Date: 2021-07-27
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

Whether the on-board calibration adopts the built-in standard lamp and integrating sphere or the solar diffuser method, the ground laboratory radiation reference is used as the on-board calibration reference, and there is a problem of tracing the source to the international unit, and the impact of the satellite launch process There is no effective monitoring method for influencing parameters such as acceleration and acceleration, and it will completely rely on its own stability to ensure its expected accuracy after launch.
The radiation calibration of operational remote sensing satellites is mainly based on site substitution calibration. At present, calibration methods based on large-area uniform radiance targets such as deserts, dry lake beds, ice and snow, etc. of tens or even hundreds of square kilometers have been developed internationally. Although it has achieved good application results, it is a single-point (radiance) calibration method, and there are certain differences in the characteristics and applicability of various algorithms.
Moreover, there are few and single sites, which are easily restricted by factors such as site location and weather conditions, resulting in long satellite calibration cycles, few opportunities, and low efficiency.
In view of the rapid development of high-resolution satellites in recent years, the use of large-area (thousands or even tens of thousands of square meters) artificial targets with excellent optical characteristics as a radiance reference target has been proposed internationally, and the radiation determination of the full dynamic range of spaceborne optical remote sensors has been realized. However, the traditional radiation calibration method centered on the calculation of radiation transfer needs to make assumptions about aerosol characteristics, atmospheric point spread function, and ambient reflectivity. The calculation error caused by the assumption is also high. At the same time, a large amount of target transportation, layout, and testing consume a lot of manpower, material and financial resources. It is not suitable for automatic calibration and high-frequency calibration of optical remote sensing satellites.

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  • A method and system for on-orbit absolute radiometric calibration of optical remote sensing satellites
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  • A method and system for on-orbit absolute radiometric calibration of optical remote sensing satellites

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Embodiment Construction

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0058] The purpose of the present invention is to make up for the defects of the prior art, and to provide an on-orbit absolute radiometric calibration method for optical remote sensing satellites based on reflection point sources, using a reflection point source ( The scale is smaller than the spatial resolution of the remote sensing satellite meter level, the radiation intensity is greater than the site and the artificial target and the remote sensing satelli...

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Abstract

The invention discloses an on-orbit absolute radiation calibration method and system for an optical remote sensing satellite. The method includes: obtaining the field information of the calibration field; using the radiation transfer model to determine the hyperspectral atmospheric transmittance of the solar path and the hyperspectral atmospheric transmittance of the remote sensing satellite observation path; Hyperspectral atmospheric transmittance and reflection point source parameters, determine the entrance pupil radiance reflected by the reflection point source target to the remote sensing satellite; obtain the radiation response value of the remote sensing satellite to each unit reflection point source target; The entrance pupil radiance of the satellite and the radiation response value of the remote sensing satellite to each unit of the reflective point source target are used to determine the on-orbit absolute radiation calibration coefficient of the optical remote sensing satellite based on the reflective point source using the calibration equation of the remote sensing satellite to complete the calibration. The invention can realize high-frequency, high-precision, business-oriented and normalized mobile calibration within the full dynamic range of high-resolution optical remote sensing satellites.

Description

technical field [0001] The invention relates to the field of optical remote sensing, in particular to an on-orbit absolute radiation calibration method and system for optical remote sensing satellites. Background technique [0002] Optical remote sensing data is not only used in the field of qualitative or semi-quantitative description of the basic characteristics of ground objects, but also goes deep into the field of quantitative interpretation of geophysical parameters and the evolution of the earth's environmental system. At the same time, the technical capabilities of refined quantitative remote sensing are also improved Rely on the support of calibration technology. Although the optical remote sensing satellite payload requires strict laboratory calibration before launch, due to factors such as satellite launch vibration and acceleration, in-orbit space environment, and aging of electronic components, the performance of the remote sensor will inevitably decay to varyin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 徐伟伟李鑫司孝龙胡运优张黎明
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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