سابِق|تال

Development of visible and short-wave infrared hyperspectral imager onboard GF-5 satellite

  • role： First author第一作者
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

  • Email：ynliu@mail.sitp.ac.cn
  • Introduction： 刘银年，1971年生,男,研究员,研究方向为高光谱遥感技术。E-mail:ynliu@mail.sitp.ac.cn
LIU Yinnian1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

SUN Dexin1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

HU Xiaoning1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

LIU Shufeng1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

CAO Kaiqin1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

CHAI Mengyang1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

LIAO Qingjun1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

ZUO Zhiqiang1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

HAO Zhenyi1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

DUAN Weibo1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

ZHOU Weiyinuo1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

ZHANG Jing1,  
  • Affiliation：

    CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics,Shanghai 200083,China

ZHANG Ying1

ملخص

Hyperspectral imaging technology provides high spectral resolution information of objects on the Earth. Hyperion and Compact High-Resolution Imaging Spectrometer have been the main sources of spaceborne hyperspectral data in the past few decades. However, the quality and quantity of the data cannot totally meet the challenging requirements of various applications. In this study, we design and present a visible and short-wave infrared hyperspectral imager called the Advanced Hyperspectral Imager (AHSI), which is one of the six payloads on China's GF-5 satellite launched on May 9, 2018. It is the first spaceborne hyperspectral sensor that utilizes convex grating spectrophotometry and an improved three concentric-mirror (Offner) configuration. We introduce the basic structure and imaging principle of AHSI.Ground object lights are reflected into an off-axis three-mirror telescope using pointing mirror. The lights are focused on a Field Of View (FOV) separator and then split into two parts. One part enters a visible/near-infrared (VNIR) spectrometer, and the other goes into a short-wave infrared (SWIR) spectrometer. Compound light is dispersed into a series of monochromatic light through convex grating and focused on a detector using a mirror with an improved Offner structure. A VNIR detector is a back-illuminated frame transfer charge-coupled device with a size of 2048×300 pixels. A SWIR detector is a HgCdTe focal plane cooled at 110 K, and has a size of 2048×512 pixels formed by four infrared focal plane arrays of the same size (512×512), with a staggering spatial arrangement. During calibration, sunlight is reflected into an optical system using a diffuse reflectance panel. The absolute radiation response of AHSI is calibrated with a solar diffuse reflection signal, and the degradation of the diffuse reflectance panel is corrected with a ratioing radiometer. The central wavelength and bandwidth are calibrated with onboard LED calibration component and solar atmospheric absorption profile, respectively (O2 adsorption peaks at 760 and 1260 nm).The main performance metrics of the AHSI are obtained and validated via well-designed on-orbit experiments. It has a spectral range of 400–2500 nm, with spectral resolutions of higher than 5 nm in the VNIR and 10 nm in the SWIR, respectively. The swath width is 60 km, and the spatial resolution is 30 m. Compared with Hyperion, which is a classical hyperspectral instrument, the imaging width of the AHSI is superior (eight times), the number of spectral bands has increased by hundreds, and the Signal-to-Noise Ratio (SNR) has improved by four times. Compared with the instruments recently developed/planned by Germany, Italy, Indian, and Japan, the AHSI has competitive performance and has evident advantages in terms of swath width and number of spectral channels. The AHSI has achieved the widest swath width and broadest spectral range to shorten the revisit time, improve the observation and monitoring efficiency, and refine the Earth’s observation.As one of the six main payloads on GF-5 satellite, the AHSI demonstrates the development of spaceborne hyperspectral imaging technology in China. It features a large FOV telescope, a low-distortion large flat-field fine spectrometer, a large-size infrared focal plane detector, a long-life large cooling capacity cryocooler, a high-precision calibration system, and a high-precision image compensation mechanism. The AHSI has outstanding capability of detecting and identifying ground objects, making it suitable to precision applications, such as ecological environment monitoring, land and resource survey, and oil/gas exploration.

مفهوم

GF-5 satellite;hyperspectral remote sensing;hyperspectral imager;wide swath width;low distortion

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