Changchun Institute of Optics and Technology breaks through the key technology of high-resolution hyperspectral imaging in spaceflight

Recently, the Changchun Institute of Optics, Fine Mechanics and Physics of the Chinese Academy of Sciences broke through the key technologies 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. The team published a total of 85 academic papers, of which 36 were included in EI and SCI, and there were 6 authorized national invention patents. At present, this technology has won the first prize of Jilin Province's 2013 scientific and technological progress award.

The Tiangong-1 hyperspectral imager developed by using this technical achievement provides technical support for China's first independent acquisition of aerospace high-resolution hyperspectral image data and fills 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.

It is reported that this technology has been applied in the development of higher performance aerospace hyperspectral imagers, and it will certainly play its due role in continuously advancing the development of China's aerospace hyperspectral remote sensing technology.

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