Study On Information Processing And Application Of CE-1 Interference Imaging Spectrometer

As first Chinese Lunar Exploration Satellite, Chang'E-1 will carry anInterference Imaging Spectrometer (ab.Ⅱ2S) made b y X i'an Institute o f Optics andPrecision Mechanics to determinate the contents and distribution of some materialsand elements on the lunar surface with x/γSpectrometer. Take into account the needsfor system design and realization of the scientific objectives, thesis are divided intothree parts to emphasize. They are optical characteristic of lunar targets, thetechnology to obtain spectral information of lunar surface (including calibration,spectral reversion, performance evaluation ofⅡS), the hyperspectral anaysistechnology about species and content of materials and elements on lunar surface.Optical characteristic of lunar targetsLunar targets are divided into three classes: lunar mineral, lunar rock and lunarsoil. In thesis, the methods of both information analysis by synthesis andexperimentation are adopted. The mechanism of reflectance spectrum and spectralcharacteristic of minerals and rocks on lunar surface are studied. The factors influencethe spectral character of lunar soil and BRDF and polarization characteristic of lunarsoil are discussed. The reflectance spectrum models of lunar soil are analyzed. Theapplications of spectral analysis in lunar exploration are discussed. Based on radiativeand spatial characteristic of lunar materials, the needs for optical instrument includingradiative dynamic range, spectral and spatial resolution are advanced.The technology to obtain spectral information of lunar surfaceThe limiting factors of methods to gain lunar hyperspectral image are anaysised.Corresponding schemes to gain the hyperspectral image in circling orbit of moon arediscussed. As a new and advanced technology in the world to gain spectrum,interference imaging spectrometer is superior in high throghout and multichannel. But a series of digitial processing must be executed to get spectrum because the raw datais interference figure of targets. In thesis, taking Chang'E-1ⅡS as an example, thetechnology about calibration, spectral reversion, performance evaluation ofcongeneric instrument are studied.The hyperspectral anaysis technologyThe information about contents and distribution of some elements and materialson the lunar surface is significance to renew and develop lunar science. It is also theimportant mission of lunar hyperspectral remote sensing and one of scientificobjectives of Chinese Chang'E-1 project. The description and analytical methods ofhyperspectral information of lunar targets are discussed in thesis. Four techniques areintroduced: first analytic methods are based on absorption characteristic in reflectancespectrum, second methods are based on statistic between optical parameter andcontents of lunar materials and elements, the followed techniques are spectralsimilitude anaysis and spectral unmixing technology. The foregrounds andrequirements of every methods for hyperspectral data in the spectral anaysis of lunarsuface are discussed. The adaptability of those methods in the Chang'E-1 InterferenceImaging Spectrometer data processing is anaysised.