Früher|Nächster

Evaluation of GF-5 AHSI on-orbit instrument radiometric performance

  • role： First author第一作者
  • Affiliation：

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

    Nantong Academy of Intelligent Sensing, Nantong 226000, China

    Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Qidong 226200, 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 Yinnian123,  
  • Affiliation：

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

    Nantong Academy of Intelligent Sensing, Nantong 226000, China

    Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Qidong 226200, China

SUN Dexin123,  
  • Affiliation：

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

CAO Kaiqin1,  
  • Affiliation：

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

LIU Shufeng1,  
  • Affiliation：

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

CHAI Mengyang1,  
  • Affiliation：

    Nantong Academy of Intelligent Sensing, Nantong 226000, China

LIANG jian2,  
  • Affiliation：

    Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Qidong 226200, China

YUAN Juan3

Resümee

The Advanced Hyperspectral Imager (AHSI), one of the six payloads on China’s GF-5 satellite that was launched on May 9, 2018, is a visible/short-wave infrared hyperspectral imager built by Shanghai Institute of Technical Physics (SITP), Chinese Academy of Sciences (CAS). In order to verify and validate the on-orbit radiometric performance of AHSI, and improve quantitative application of the AHSI data, the instrument conducts on-orbit radiometric characterizations from June 2018 to April 2019. Solar calibration and vicarious calibration were both utilized.Observational and calibration data of well-known calibration sites, such as, Dunhuang and Baotou calibration field in China, were acquired and analyzed to determine whether the pre-flight characterization was still applicable to on-orbit operations. These data was used to measure specific instrument parameters, such as, in corresponding order, (1) Signal to Noise Ratio (SNR), (2) relative and absolute radiometric calibration accuracy, (3) uncertainty of on orbit absolute radiometric calibration, (4) validation accuracy of site absolute radiometric calibration, (5) dynamic range and (6) radiometric performance stability. The definition of these parameters as well as the acquisition of the coefficients of relative and absolute radiometric calibration has been illustrated.Results show that the SNR of AHSI reaches up to 700 at a wavelength of about 500 nm, and 500 at a wavelength of about 1500 nm, the error of relative and absolute radiometric calibration are smaller than 0.5% and 3%, respectively, the uncertainty of on orbit absolute radiometric calibration is within 2.59%(VNIR) and 2.68%(SWIR), the error of the validation of site absolute radiometric calibration is smaller than 5%, and the dynamic range can be fined with 256 gain. In particular, with the image motion compensating, the integration time can be prolonged and the SNR can be further increased, therefore, object/region with weak signal, such as, the sea/lake, the Antarctic and the Arctic can also be observed. In addition, the variation of the dark level, SNR, and the coefficients of relative radiometric calibration from September 2018 to March 2019 are all much less than 1%, meaning that the radiometric response and noise value are stable, which in turn reflects that the radiometric performance of AHSI is stable.The on orbit characterization of GF-5/AHSI lasted for seven months and with continuing assessment of the instrument throughout the first year of operations. As it can be seen, the AHSI has good and stable on-orbit radiometric performance, i.e., high SNR, high calibration accuracy, and high consistency. Therefore, the data of AHSI is highly reliable and can be used in quantitative applications.

Schlüsselwort

remote sensing;GF-5 satellite;hyperspectral imager;on-orbit measurements;instrument radiometric performance;signal to noise ratio;radiometric calibration;validation experiment;dynamic range

References

  1. 1.
    Beiso D. 2002. Overview of hyperion on-orbit instrument performance, stability , and artifacts//Proceedings of the 31st Applied Imagery Pattern Recognition Workshop. Washington, DC, USA: IEEE: 95-104 [DOI: 10.1109/AIPR.2002.1182260]
  2. 2.
    Biggar S F, Thome K J, Holmes J M, Kuester M A and Schowengerdt R A . 2001. In-flight radiometric and spatial calibration of EO-1 optical sensors//IEEE International Geoscience and Remote Sensing. Sydney, NSW, Australia: IEEE: 305-307 [DOI: 10.1109/IGARSS.2001.976139]
  3. 3.
    Chen Z C, Zhang B, Luo W F, Hu F C, Li J S, Liu X, Zhang L, Zhang H, Zhang L M and Chi Y B . 2008. On-orbit performance assessment of Beijing-1 microsatellite sensors. Journal of Remote Sensing, 12(3): 468-476
  4. 4.
    He H Y, Wang X Y and Fu X K . 2008. Study on the designing of the dynamic range of remote satellite’s CCD camera. Spacecraft Recovery and Remote Sensing, 29(1): 39-42, 49
  5. 5.
    Hu B L, Zhang J, Cao K Q, Hao S J, Sun D X and Liu Y N . 2018. Research on the Etalon effect in dispersive hyperspectral VNIR imagers using back-illuminated CCDs. IEEE Transactions on Geoscience and Remote Sensing, 56(9): 5481-5494
  6. 6.
    Hu Y F and Zhang Y F . 2007. Analysis of relative radiometric calibration accuracy of space camera. Spacecraft Recovery and Remote Sensing, 28(4): 54-57
  7. 7.
    Huang H L, Yi W N, Qiao Y L and Du L L . 2012. On orbit radiometric calibration for Mapping Satellite-1 sensor. Journal of Remote Sensing, 16(S1): 22-27
  8. 8.
    Jarecke P, Yokoyama K and Barry P . 2001. On-orbit radiometric calibration the hyperion instrument//IEEE International Geoscience and Remote Sensing (IGARSS). Sydney, NSW, Australia: IEEE: 2825-2827 [DOI: 10.1109/IGARSS.2001.978176]
  9. 9.
    Wan Z, Li B Y, Liu Z X, Liu H X and Ren J W . 2015. Spectral and radiometric calibrations for mapping satellite-1 camera. Optics and Precision Engineering, 23(7): 1867-1873
  10. 10.
    Xu N, Hu X Q, Chen L, Zhang Y, Hu J Y and Sun L . 2014. On-orbit radiometric calibration accuracy of FY-3A MERSI thermal infrared channel. Spectroscopy and Spectral Analysis, 34(12): 3429-3434
  11. 11.
    Zhang X W, Fu Q Y, Han Q J, Pan Z Q and Yang L . 2014. The field radiometric calibration and validation of ZY-3 multispectral sensor. Spectroscopy and Spectral Analysis, 34(9): 2476-2480
  12. 12.
    Zhang Y X, Liu Y and Ge W Q . 2010. Development and prospect of image motion compensation technology. Chinese Journal of Optics and Applied Optics, 3(2): 112-118

Lesen Sie die ganze Passage

The above content is generated by Large Model Translation. The translated content is for reference only. We do not assume any commercial or legal responsibilty for any consequences arising from the use of our website