Shortwave Infrared Imaging Spectrometer Electronics Key Technologies

As HJ-1-A Satellite, one of the Environment and Disaster Monitoring and Forecast Satellites, was launched successfully, Hyper-spectral Imaging Spectrometer in visible band with self-property right is put into practice. Meanwhile, an advanced requirement for self developing Hyper-spectral Imaging Spectrometer in short wave and near infrared band is proposed. This paper studies the key technologies of the high-speed digital SWIR (Short-Wave Infrared) imaging system which is based on MCT FPA (Focal Plane Array) image sensor.Firstly, the development of the Hyper-spectral Imaging Spectrometer, the theories of Infrared imaging, and the pretreatment of infrared image, are introduced in this paper. We have also analyzed the timing relationship of image sensor and the timing relationship among system modules. Further more, we have designed the driving logic circuit of NEPTURN image sensor, described in VHDL (Very-High-Speed Integrated Circuit Hardware Description Language) from top to bottom. All these logic circuits were realized by FPGA (Field Programming Gate Array) device programming. The high-speed multi-channel parallel A/D converter circuit has converted high speed analog image signals to digital signals. LVDS high-speed circuit not only improves the reliability and anti-interference ability of distant transmission of high-speed image signals.After analyzing the characteristics of infrared image, we have discussed the scene based Non-uniformity Correction (NUC) algorithm and the calibration-based NUC algorithm separately. The results of image processing are simulated on the hardware platform.At the end of this paper, the system designing is summarized, and the problems under resolved are summing up too. It's provided the reference for future.