Spectrum calibration method based on sun and atmosphere characteristic spectrum in hyperspectral remote sensor flight

Abstract

The invention discloses a spectrum calibration method in hyperspectral remote sensor flight. The spectrum calibration method includes that a sun fraunhofer line and an atmosphere characteristic absorbing line are used as a standard reference spectrum under the normal working condition in the hyperspectral remote sensor flight, and determination of center wavelength offset and spectral bandwidth is achieved through matching of equivalent spectrum reflection rate rho*(lambda) and equivalent spectrum reflection rate of lowpass filtering. The spectrum calibration process does not depend on measurement of surface feature spectrum reflection rate, and effects of indeterminacy of radiation calibration of a remote sensor are reduced. The spectrum calibration method is achieved through a look-up table method and improves executive efficiency of a program. The spectrum calibration method can achieve spectrum calibration during onboard or satellite-borne hyperspectral remote sensor flight and spectrum calibration of a field surface feature spectrum radiometer smaller than 0.2 nm and has significant meaning in hyperspectral remote sensing.

Description

technical field [0001] The invention belongs to the field of optical remote sensing science, and relates to a spectral calibration method based on solar and atmospheric characteristic spectral lines during flight of a hyperspectral remote sensor. Background technique [0002] Hyperspectral remote sensors can obtain fine continuous spectral information of targets. In recent years, they have played an increasingly important role in the fields of national defense, military, land and resources investigation, precision agriculture, environmental monitoring, and atmospheric detection. The spectral calibration for the purpose of determining the central wavelength and bandwidth of the spectral channel of the hyperspectral remote sensor is the premise of the quantitative application of its telemetry data. Pre-flight laboratory spectral calibration is generally achieved by monochromator scanning or spectral matching of characteristic absorption wavelength plates. Center wavelength an...

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Problems solved by technology

Pre-flight laboratory spectral calibration is generally achieved by monochromator scanning or spectral matching of characteristic absorption wavelength plates. Center wavelength and bandwidth subject to change

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