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Introduction of the radiometric benchmark satellite being developed in China for remote sensing

  • role： First author第一作者
  • Affiliation：

    National Meteorological Satellite Center, Beijing 100081， China

  • Email：lunm@cma.gov.cn
  • Introduction：卢乃锰，1963年生，男，研究员，研究方向为辐射校正技术。E-mail:lunm@cma.gov.cn
LU Naimeng1,  
  • Affiliation：

    Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083， China

DING Lei2,  
  • Affiliation：

    Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031， China

ZHENG Xiaobing3,  
  • Affiliation：

    Changchun Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Changchun 130033， China

YE Xin4,  
  • role： Corresponding author通信作者
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094， China

  • Email：crli@aoe.ac.cn
  • Introduction：李传荣，1956年生，男，研究员，研究方向为遥感地面系统工程。E-mail:crli@aoe.ac.cn
LI Chuanrong5*,  
  • Affiliation：

    Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029， China

LYU Daren6,  
  • Affiliation：

    National Meteorological Satellite Center, Beijing 100081， China

ZHANG Peng1,  
  • Affiliation：

    National Meteorological Satellite Center, Beijing 100081， China

HU Xiuqing1,  
  • Affiliation：

    Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101， China

ZHOU Chenghu7,  
  • Affiliation：

    Tsinghua University, Beijing 100084， China

YOU Zheng8,  
  • Affiliation：

    Beijing University of Aeronautics and Astronautics, Beijing 100083， China

FANG Jiancheng9,  
  • Affiliation：

    Wuhan University, Wuhan 430000， China

GONG Jianya10,  
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081， China

JIANG Xingwei11,  
  • Affiliation：

    Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031， China

LI Jianjun3,  
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094， China

MA Lingling5,  
  • Affiliation：

    National Meteorological Satellite Center, Beijing 100081， China

XU Na1

résumé

In the demand of the quantitative use of satellite data, the accuracy of instrument calibration improved significantly because of the efforts of major satellite operators. However after decades of development, the current premium uncertainty of radiometric calibration of remote sensing satellites stays at 2% in visible, 0.5 k in infrared spectrum, due to the design restrains of on-board calibration devices, and also the theoretical limitation of vicarious techniques. Since the beginning of 21 st century, global climate change has become the common concern of international community. Global climate research placed an unprecedented need on the accuracy of radiometric calibration for remote sensing satellites. According to ASIC3 report, in order to detect climate change signals effectively and make accurate predictions, the acceptable uncertainty of radiometric calibration is 0.3% for solar reflective spectrum, 0.1 k for infrared spectrum, and 0.01% for total solar irradiance. Living up to the challenge, EU and US proposed TRUTHS and CLARREO plans, with the common goal of launching benchmark satellites. The benchmark satellites, with their extreme accuracy, designed to monitor climate change, could also calibrate other remote sensing satellites in orbit, raising the observation accuracy of the whole global satellite system to a new level. Meanwhile, China also advocated the concept of space radiometric observation benchmark system and launched two five-years projects to develop cutting-edge techniques such as phase-change warm load blackbody and on-orbit cryogenic absolute radiometer etc., aiming at establishing the absolute radiometric reference in space. With the support of these projects, the spaceborne SI-traceable calibrators for Reflective Solar Bands (RSBs) and Thermal Emissive Bands (TEBs) is developing. In the middle of the next five years, we can complete the development of the principle prototype of the radiometric benchmark instruments, and then achieve a comprehensive performance verification.Comparing to its counterparts, China could more likely become the first country to launch radiometric benchmark satellite, which leads remote sensing satellites to a SI-traceable era.

mots-clés

space radiometric measurement;benchmark;satellite;traceable;technique

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