A method for on-board calibration of space remote sensing instruments based on segmental fitting of solar spectrum by leds

Abstract

The invention discloses an on-board calibration method for a space remote sensing instrument based on segmental fitting of the solar spectrum by LEDs, which is characterized in that three-color LEDs are selected by an algorithm to fit the standard solar spectrum curve corresponding to the spectral channel of the space remote sensing instrument , to get the calibration coefficient matrix K of the LED; sequentially ignite the LED light source, and introduce it into the space remote sensing instrument and the transfer radiometer respectively, and obtain the responsivity matrix ρ of the transfer radiometer when each LED is individually lit TRc ; Through the calibration coefficient matrix K of the LED and the responsivity matrix ρ of the transmissive radiometer in the case of a monochromatic light source TRc , the comprehensive response coefficient of each channel of the transfer radiometer is ρ TR =K·ρ TRc ′; Observing the calibration light source with the three-color LED simultaneously lit by the transfer radiometer and the space remote sensing instrument, the channel response value matrix S of the transfer radiometer is respectively obtained TR ; The response value matrix S of the space remote sensing instrument IM , calculate the response rate matrix ρ of each channel of the remote sensing instrument IM =(S IM · / S TR )·ρ TR . The invention ensures the high precision of on-board calibration of the space remote sensing instrument.

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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