| In recent years,due to climate and environmental changes,people have gradually realized the importance of studying and protecting the atmosphere.In order to more accurately assess the impact of human activities or natural phenomena on the atmosphere from now on,a global observing system for atmospheric sounding is urgently needed.Based on the FY-3(06)star ultraviolet hyperspectral ozone profile detector,this paper carries out the research on the correlation radiation correction method.Ultraviolet hyperspectral ozone profile detector is the second generation of new space ozone profile remote sensing instrument in my country.The core indicators such as spectral resolution and radiometric calibration accuracy have been greatly improved.It is the first domestic operational satellite to realize limb atmospheric detection.The load is a great challenge to the accuracy of radiation correction and product inversion.The radiometric calibration of space remote sensing instruments is an important link in the quantification of remote sensing products.Its purpose is to convert the electronic information received by remote sensing instruments into real and reliable radiometric values.Therefore,the high-precision quantitative products of space remote sensing instruments largely depend on the accuracy of radiometric calibration of remote sensing instruments.In order to provide more accurate data support for the inversion of global atmospheric ozone content,this paper comprehensively analyzes the remote sensing Influence factors of radiation transmission link,carried out laboratory verification test and radiation correction algorithm research.This research has important scientific significance and application value,and plays a vital role in ensuring that the remote sensing data of this replacement product achieves the expected quality goals.This paper focuses on the following four parts:1.Carried out research on the precise integration and radiation performance of the ultraviolet hyperspectral ozone profile detector.The instrument adopts an off-axis parabolic mirror group and a secondary dispersion system of prism + grating.The optical structure is complex and the precision integration is difficult.Designed and invented a new high-precision and high-efficiency optical-mechanical system integration method,studied the relationship between the unit module and the performance parameters of the whole machine,and adopted integration-detectionintegration successive approximation iterations.Finally,various key radiation performance indicators after the complete machine were analyzed and tested,including signal-to-noise ratio,stray light,and instantaneous field of view.The results verified that this method can effectively improve the accuracy and efficiency of optical system integration.2.Research on the spectral response characteristics of the ultraviolet hyperspectral ozone profiler was carried out.Aiming at the requirement that the spectral calibration accuracy of the instrument is better than 0.01 nm and the limitation of the output monochromatic light energy and wavelength accuracy of the traditional monochromator calibration.Based on the in-depth analysis of the working principle and performance of tunable lasers,combined with the characteristics of the instrument,a new spectral calibration method using two tunable lasers is proposed.Through the method of high-precision discrete point measurement combined with wide-area continuous spectrum scanning,the sub-pixel spectral calibration of the ultraviolet hyperspectral ozone profile detector is realized,and the calibration accuracy is better than 0.005 nm.3.Carried out research on on-orbit radiation polarization correction of space remote sensing instruments.In view of the problem that the ultraviolet hyperspectral ozone profile detector contains a large number of polarization-sensitive devices and the polarization characteristics of the detection target have a great influence on the radiation transmission accuracy of the instrument,a ground calibration device for the polarization characteristics of the ultraviolet hyperspectral ozone profile detector was established.The polarization characteristics of the instrument,the elements of the Mueller matrix,and the analysis and test device introduced error factors into the measurement system,and the correction method was studied through testing and calculation.After correction,the calibration accuracy of the polarization characteristics reached 1.4%.And by deriving the theory of on-orbit incident light measurement and analyzing the polarization characteristics of atmospheric scattering spectrum,a set of on-orbit polarization measurement and correction scheme suitable for ultraviolet hyperspectral ozone profile detector is established.4.Carried out research on radiation response calibration and traceability of ultraviolet hyperspectral ozone profile detector.In order to realize the high-precision quantitative application requirements of remote sensing data,the radiation calibration accuracy is better than 3%.Using the standard lamp system traceable to the National Institute of Standards and Technology(NIST)and the National Institute of Metrology(NIM),a high-precision radiation reference transfer link suitable for ultraviolet hyperspectral ozone profile detectors was established,and the transfer link was analyzed in depth Various error sources,and corrected the largest error source—response nonlinearity,finally ensured the absolute radiation calibration accuracy of the instrument. |
