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On-orbit Relative Radiation Calibration Method and System for Video Satellite

A technology of relative radiometric calibration and video, which is applied in the field of on-orbit relative radiometric calibration of video satellites, can solve problems that are difficult to apply to area array sensors, and achieve the effects of reducing costs, improving accuracy, and eliminating the effects of randomness

Active Publication Date: 2020-07-24
WUHAN UNIV
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Problems solved by technology

Video satellites use area array sensors for imaging. Compared with traditional linear array push-broom imaging satellites, the same algorithm is difficult to apply to area array sensors. In addition, applications such as dynamic target tracking and trajectory determination of video satellites have high radiation calibration accuracy. requirements

Method used

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  • On-orbit Relative Radiation Calibration Method and System for Video Satellite

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Embodiment Construction

[0043] After the video satellite is launched, due to changes in the space environment, such as temperature changes, physical vibrations, etc., and the attenuation of the satellite sensor probe itself, the response of the satellite sensor probe changes, making the laboratory calibration before the satellite launch unusable. On-orbit relative radiometric calibration must be performed. The invention utilizes video satellite level flight imaging mode (also known as push-broom imaging mode) imaging to obtain video multi-frame sequence images. Using the high-precision registration method to obtain the inter-frame motion parameters, use the inter-frame motion parameters to estimate the real object image, and use the video multi-frame sequence image and the estimated real object image to solve each detection of the video area sensor based on the principle of least squares. The relative calibration coefficient of the element is used to realize the on-orbit relative radiation calibratio...

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Abstract

The invention discloses an on-orbit relative radiometric calibration method and system for a video satellite. The method comprises the following steps: S1, acquiring multi-frame sequential images of a video through parallel-flight-mode of the video satellite; S2, selecting one frame of image from the multi-frame sequential images as a reference image, subjecting the rest frames of images to registration with the reference image and carrying out motion compensation; S3, estimating the image of the apparent radiance of a real ground object based on the multi-frame sequential images of the video having undergone motion compensation; and S4, resolving the calibration parameters of a video area array sensor based on the estimated image of the apparent radiance of the real ground object and the multi-frame sequential images of the video obtained in the step 1 and carrying out correction. The on-orbit relative radiometric calibration method and system provided by the invention are applicable to on-orbit relative radiometric calibration m of the area array sensor of the video satellite and have the advantages of high precision, convenience and low cost.

Description

technical field [0001] The invention relates to a video satellite on-orbit relative radiation calibration method, in particular to a video satellite in-orbit calibration method that does not depend on ground calibration fields and special uniform objects (such as dense clouds at the North and South Poles, deserts, oceans, snow, etc.) Orbit-relative radiometric calibration method and system. Background technique [0002] After more than 30 years of development, my country's aerospace technology has made great progress, and a system of earth observation remote sensing satellites consisting of resources, meteorology, ocean, environment, and national defense series has been formed. Especially under the impetus of the "High Resolution Earth Observation System" national major science and technology project, through innovations in the development of platform sensors, multi-satellite networking, and ground data processing, the spatial resolution and time resolution of my country's r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 张过李立涛汪韬阳蒋永华沈欣
Owner WUHAN UNIV
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