Infrared-spectrum satellite full-dynamic range multipoint radiance calibration device and calibration method

Abstract

The invention relates to an infrared-spectrum satellite full-dynamic range multipoint radiance calibration device and an infrared-spectrum satellite full-dynamic range multipoint radiance calibration method, and belongs to the technical field of remote sensing quantitative application. The calibration device is fixed in a camera optical system to be calibrated. A satellite supplies power to a temperature control circuit. The calibration device comprises the temperature control circuit, a calibration light source, a calibration optical component, a temperature sensor and a package, wherein the temperature control circuit, the calibration light source and the calibration optical component are packaged by the package; and the temperature control circuit comprises a programmable logic device, an analogue / digital converter, a digital / analogue converter and an operational amplifier. The temperature control circuit can provide different irradiance values for a focal plane, and the calibration light source adopts a nickel-chromium alloy and a combined design, so that high stability and radiation capability under the heating of current of different levels are ensured, an irradiance level covering a full dynamic range can be generated, and satellite calibration accuracy is directly improved.

Description

technical field [0001] The invention relates to a full dynamic range multi-point radiation calibration device and a calibration method on an infrared spectrum segment satellite, and belongs to the technical field of remote sensing quantitative application. Background technique [0002] The radiometric calibration of space remote sensing cameras is an essential technical means to realize the quantitative application of space remote sensor data and ensure the good performance of space remote sensors in orbit. The radiometric calibration of space remote sensing cameras can be roughly divided into pre-launch calibration and post-launch on-orbit calibration according to the time axis of the calibration task. Calibration before launch mainly refers to laboratory calibration or flight calibration, and calibration after launch mainly refers to on-board calibration using the calibration device installed in the space camera, site calibration using the ground calibration field, Perfor...

AI Technical Summary

Problems solved by technology

However, most of these devices can only provide the irradiance values ​​corresponding to several specific temperature points, the calibration points are selected at large intervals, and often cannot cover the entire dynamic range of the detector.

This makes it difficult to improve the accuracy of relative radiometric calibration for infrared detection pixels whose response curves are often difficult to achieve accurate interpolation and fitting through fewer data points in the entire dynamic range.

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