Chinese Academy of Sciences made breakthroughs in key technologies of high-resolution hyperspectral imaging in spaceflight

A few days ago, the Changchun Institute of Optics, Chinese Academy of Sciences broke through the key technology of high-resolution hyperspectral imaging in spaceflight. This technology utilizes off-axis tri-aspheric aspheric optical system, compound prism beam splitting, push-broom imaging and pointing mirror motion compensation technology to effectively solve the problems of high spatial resolution, high spectral resolution and high signal-to-noise ratio in aerial hyperspectral remote sensing The contradiction has broken through key technical bottlenecks such as field-of-view separation, spectral spectroscopy, and on-orbit spectral radiation calibration, laying a technical foundation for the engineering of China's aerospace high-resolution hyperspectral imaging technology.

Yan Changxiang, a researcher at the Changchun Institute of Optics, and his research team have proposed a series of innovative solutions to key technical bottlenecks such as field of view separation, spectral spectroscopy, image signal-to-noise ratio, and on-orbit spectral radiometric calibration in the field of aerospace hyperspectral remote sensing. The research team adopted the technical solution of off-axis tri-reflective aspheric optical system, single crystal silicon field-free splitter and compound prism beam splitting plus aspheric collimated imaging spectrometer to realize full color, visible near infrared and short wave infrared Accurate separation of the three optical paths ensures wide wavelength coverage of the system, and achieves high spectral and high spatial resolution, high signal-to-noise ratio, and guarantees the quality of spectral imaging. The team adopted a pointing mirror motion compensation scheme to establish a mathematical model for real-time calculation of the pointing mirror motion compensation curve on orbit, realizing real-time calculation and control, increasing the optical energy received by the detector by 4-6 times, and significantly improving the system reliability. The noise ratio resolves the contradiction between high-spectral and high-spatial-resolution imaging. At the same time, the research team also adopted the on-orbit calibration technology of coated neodymium praseodymium glass and integrating sphere, and used the pointing mirror self-alignment to achieve full optical path spectrum and radiation calibration.

At the same time, the Tiangong-1 hyperspectral imager developed by using this technology has provided technical support for China's first independent acquisition of high-resolution hyperspectral image data for aerospace, and filled the domestic gap. Tiangong No. 1 hyperspectral imager has been in stable operation for two and a half years, has acquired a large amount of hyperspectral image data, and has been used in oil and gas exploration, mineral exploration, forestry investigation, land use / cover change, coastal resource survey, etc. It provides a scientific decision-making basis for the sustainable and healthy development plan of the national economy.

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