Space remote sensing instrument on-board calibration method based on LED segmented fitting solar spectrum

Abstract

The invention discloses a space remote sensing instrument on-board calibration method based on an LED segmented fitting solar spectrum. The method is characterized by comprising the following steps: selecting three-color LEDs through an algorithm to fit a standard solar spectrum curve corresponding to a spectrum channel of a space remote sensing instrument to obtain a calibration coefficient matrix K of the LEDs; sequentially igniting the LED light sources, and respectively introducing the LED light sources into the space remote sensing instrument and a transmission radiometer to obtain a responsivity matrix rhoTRc of the transmission radiometer when each LED is independently lightened; calculating the comprehensive response coefficient of each channel of the transmission radiometer as rho = K.rho < TRc > ' according the calibration coefficient matrix K of the LED and the transmission radiometer response rate matrix rho < TRc > under the condition of the monochromatic light source; simultaneously observing calibration light sources which are simultaneously lightened by the three-color LEDs through the transmission radiometer and the space remote sensing instrument to respectively obtain a channel response value matrix STR of the transmission radiometer; and calculating a response rate matrix rho IM = (SIM * / STR) * rho TR of each channel of the remote sensing instrument according to a response value matrix SIM of the space remote sensing instrument. According to the invention, high precision of on-board calibration of the space remote sensing instrument is ensured.

Description

technical field [0001] The invention belongs to the technical field of on-board radiation calibration of space remote sensing instruments, and more specifically relates to a high-precision on-board calibration method of space remote sensing instruments based on LED segmental fitting of solar spectrum. Background technique [0002] With the development of scientific research, especially in the field of national economy, research on issues such as crop yield estimation, mineral exploration, resource survey, and environmental monitoring requires high-precision spatial remote sensing data. Before and after the launch of space remote sensing instruments, the calibration transmission link is broken, which makes the calibration accuracy on orbit difficult to meet the needs of remote sensing applications. Therefore, it is imminent to establish an on-orbit high-precision calibration link of space remote sensing instruments traceable to space cryogenic radiometers. [0003] In the pr...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of calibration accuracy in the existing space remote sensing instrument on-board radiation calibration method, thereby proposing a radiation calibration method based on LED segmental fitting solar spectrum, which has high calibration accuracy , long life and other characteristics

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