Adaptive Correction Method and System for Spectral Offset External Field of Spectrum Correlation System

Abstract

The invention discloses a method and system for self-adaptive correction of the spectral offset external field of a map correlation system, which belongs to the cross-technical field of spectroscopy and remote sensing. Use the spectral sensor to collect black body data and denoise in a spectral segment, and calculate multiple sets of system radiation bias and system response functions, so as to obtain the variation model of the system radiation bias with temperature in this spectral segment, and obtain each spectral segment After the change model within the measurement spectrum, the change model b(λ″) of the system radiation bias with temperature changes in the entire measurement spectrum is obtained comprehensively; the second stage: at any measurement moment, the real-time temperature t under external field conditions is obtained and substituted into the change model After b(λ″), the optical system radiation bias b t (λ″), so as to realize the adaptive correction of the system radiation bias of the spectral sensor. The invention can adapt to the change of the ambient temperature and the non-uniformity of the spectral sensor response, and improve the spectrum measurement accuracy of the map correlation system.

Description

technical field [0001] The invention belongs to the cross technical field of spectroscopy and remote sensing, and more specifically relates to an adaptive correction method and system for spectral offset external field of a map correlation system. Background technique [0002] Multi-spectral technology is a method to distinguish the type of the measured object according to the relationship between the spectral response of the measured object and the wavelength. Among them, the relationship between the radiance (radiation intensity) and wavelength of the measured object is the most basic description in the study of the radiation characteristics of the measured object. Estimating the radiation characteristics of the measured object needs to be obtained through black body calibration in the laboratory The system radiation bias and system response function of the spectral sensor, and the radiation characteristics of the measured object can be obtained after removing the internal...

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Problems solved by technology

[0003] The existing system radiation bias and system response function calculation methods have the following problems: (1) The commonly used calculation method is the two-point correction method, but under outdoor conditions, the spectral sensor in the observation equipment will be affected by the ambient temperature, so Inability to use calculated system radiation bias measured under laboratory conditions, that is, existing correction methods lack the ability to adapt to changes in ambient temperature

(2) The spectral sensor of the spectral detection equipment (spectrum correlation system) has the non-uniformity of the spectral response, and its non-uniformity changes nonlinearly with the ambient temperature in the external field, and the nonlinear change of the radiation bias of the system affects the detection equipment Spectral accuracy of

[0004] In general, due to the adverse effect of the ambient temperature of the external field on the system radiation bias of the spectral sensor and the non-uniformity of the response of the spectral sensor, it is very difficult to directly use the parameters of the system radiation bias correction obtained in the laboratory for the external field measurement error. Large; creating a constant temperature condition in the external field for measurement can guarantee the accuracy of the external field measurement to a certain extent, but because the constant temperature condition in the external field is expensive, and the constant temperature device is bulky, the applicability is not high

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