Research On Ground Radiation Calibration Method And Device Of Airborne Hyperspectrometer

As a new type of optical instrument,airborne hyperspectral imaging spectrometer is widely used in aerospace,precision measurement,geological exploration and other related fields.After years of rapid development,with the continuous expansion of the detection range of imaging spectrometers,people’s demand for improving the application level of detection data quantification is gradually increasing,and the highprecision calibration of imaging spectrometers becomes more and more important.In order to meet the actual requirements of the calibration experiment,improve the calibration efficiency,reduce the calibration cost,overcome the site restrictions,and improve the convenience of the calibration experiment,it is of great significance to study an efficient ground radiation calibration method and ground calibration device And extremely high practical application value.This article takes the improvement of ground calibration efficiency and the reduction of calibration cost as the starting point,and designs the ground radiation calibration method and ground calibration device in combination with the actual calibration situation.Using the Lambertian reflection principle and the imaging principle of the hyperspectral imaging spectrometer,a hyperspectral working state parameter model is established,which includes the spectrometer receiving position,pupil and ground reflection angle and other working position parameters,ground reflectance,illuminance change rate,etc.Working state parameters.By studying the principle of ground radiation calibration,find the variable parameters in the working parameter model,based on this,design a variable-angle ground radiation calibration method,determine the reflectivity of the reflection plane by calculating the zenith angle during operation,and control the The change of the variable parameters can obtain the radiance required by the spectrometer for radiation calibration.At the same time,the spectrometer measures the corresponding spectral data,and establishes the calibration relationship between the radiance at each angle and the spectral data.Based on this and combined with the actual needs of the calibration experiment,the functional and technical indicators of the calibration device are clearly determined,and the scheme and mechanical design of the experimental calibration device are completed.Apply the calibration experiment device to design the verification experiment of the calibration principle and method to verify the correctness and feasibility of the method.