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"Infrared emission spectrum space radiation reference load technology" project started
On the China Instrument Network, a significant development has taken place in the field of infrared remote sensing technology. Recently, the kick-off meeting for the "Infrared Emission Spectrum Space Radiation Reference Load Technology" project, part of the 13th Five-Year National Key Research and Development Program under the "Earth Observation and Navigation" special initiative, was held at the Shanghai Institute of Technical Physics, Chinese Academy of Sciences.
This project aims to address a critical need in climate change research, where satellites must detect temperature changes of less than 1K over a century. To achieve this, the establishment of an accurate satellite infrared radiation temperature measurement benchmark is essential. Currently, China lacks a standardized measurement basis for meteorological satellite remote sensing temperature data. This project seeks to overcome that gap by developing core technologies for space blackbody radiation sources, enabling precise remote calibration and improving the quantitative accuracy of infrared remote sensing systems in China.
As a key component of the 13th Five-Year Plan, the project focuses on high-precision interferometric infrared hyperspectral ground observation reference loads. It involves breakthroughs in high-precision infrared calibration sources, wide-band high-sensitivity detection, stable modulation, flutter suppression, and spectrum and radiation calibration technologies. The goal is to develop a prototype of an ultra-high-spectrum infrared radiation reference load and complete its accuracy verification.
Approved in May 2018, the project spans four main topics: hyperspectral infrared reference load technology, space infrared radiation reference source development and traceability, data preprocessing and correction models for infrared hyperspectral reference loads, and space application technologies for these loads.
The China Institute of Metrology leads the topic on the development of space infrared radiation reference sources and traceability technology. This part of the project focuses on creating a high-precision, traceable infrared emission source aligned with international unit standards. A large-caliber space infrared radiation reference blackbody calibration system covering a temperature range from 250 K to 330 K will be developed, along with research into bright temperature reference value transfer methods. The aim is to establish a high-precision spatial reference calibration system that is traceable to SI units.
At the kick-off meeting, the project leader and researcher from the Shanghai Institute of Technology, Ding Lei, presented the implementation plan for the "Infrared Emission Spectrum Space Radiation Reference Load Technology" project.
Upon completion, this project will standardize remote sensing radiation calibration mechanisms, ensuring all direct data or active output data can be traced back to the International System of Units (SI). It will provide core technological support for building an autonomous space-based absolute radiometric calibration reference system and a nationwide integrated remote sensing network. This development holds immense scientific and political significance for China's climate, land, and environmental monitoring and forecasting efforts.
(Sources: China Institute of Metrology, Hubei Bureau of Quality and Technical Supervision, Ministry of Science and Technology)