Standard transfer chain for radiometric calibration of optical sensing instruments with traceability in solar reflective bands

Yu-peng, 王玉鹏 Wang; Xiuqing, 胡秀清 Hu; Hong-rui, 王红睿 Wang; Xin, 叶新 Ye; Wei, 方伟 Fang

doi:10.3788/ope.20152307.1807

Cited by 8 publications

(2 citation statements)

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“…On-orbit traceability of EMIS is achieved through the space cryogenic absolute radiometer (SCAR) (refer to Figure 3 in [162] for a schematic of the SI traceability chain), which works as an electrically substituted radiometer at a 20 K operating temperature. The prototype started in 2015, and uncertainty analysis showed that the SCAR of the first version was much better than 1% [175,176].…”

Section: Libramentioning

confidence: 99%

Activities to Promote the Moon as an Absolute Calibration Reference

Jing

Wang

et al. 2023

Remote Sensing

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The accuracy and consistency of Earth observation (EO) instrument radiometric calibration is a fundamental prerequisite for achieving accurate results and delivering reliable predictions. Frequent calibration and validation (Cal/Val) activities are needed during the instrument’s lifetime, and this procedure is often extended to historical archives. Numerous satellites in orbit and proposed future missions have incorporated lunar observation into their vicarious calibration components over recent years, facilitated by the extreme long-term photometric stability of the Moon. Since the birth of the first lunar calibration reference model, lunar-dependent calibration techniques have developed rapidly, and the application and refinement of the lunar radiometric model have become a welcome research focus in the calibration community. Within the context of the development of lunar observation activities and calibration systems globally, we provide a comprehensive review of the activities and results spawned by treating the Moon as a reference for instrument response and categorize them against the understanding of lunar radiometric reference. In general, this appears to be a process of moving from data to instruments, then back into data, working towards a stated goal. Here we highlight lunar radiometric models developed by different institutions or agencies over the last two decades while reporting on the known limitations of these solutions, with unresolved challenges remaining and multiple lunar observation plans and concepts attempting to address them from various perspectives, presenting a temporal development. We also observe that the methods seeking uncertainty reduction at this stage are rather homogeneous, lacking the combination of approaches or results from lunar surface studies conducted by many spacecraft missions, and joint deep learning methods to extract information. The factors that influence the accuracy of the measurement irradiance may be regulated when practical models arrive. As a central element in lunar calibration, the development of an absolute radiometric datum helps to better understand the Earth system.

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Section: Libramentioning

confidence: 99%

Activities to Promote the Moon as an Absolute Calibration Reference

Jing

Wang

et al. 2023

Remote Sensing

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“…A Chinese expert group on earth observation and navigation with the 863 Project proposed the concept of a radiometric benchmark satellite in 2006 [33]. The Chinese Space-based Radiometric Benchmark (CSRB) project has been under development since 2014.…”

Section: Introductionmentioning

confidence: 99%

Instrument Development: Chinese Radiometric Benchmark of Reflected Solar Band Based on Space Cryogenic Absolute Radiometer

Lin

et al. 2020

Remote Sensing

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Low uncertainty and long-term stability remote data are urgently needed for researching climate and meteorology variability and trends. Meeting these requirements is difficult with in-orbit calibration accuracy due to the lack of radiometric satellite benchmark. The radiometric benchmark on the reflected solar band has been under development since 2015 to overcome the on-board traceability problem of hyperspectral remote sensing satellites. This paper introduces the development progress of the Chinese radiometric benchmark of the reflected solar band based on the Space Cryogenic Absolute Radiometer (SCAR). The goal of the SCAR is to calibrate the Earth–Moon Imaging Spectrometer (EMIS) on-satellite using the benchmark transfer chain (BTC) and to transfer the traceable radiometric scale to other remote sensors via cross-calibration. The SCAR, which is an electrical substitution absolute radiometer and works at 20 K, is used to realize highly accurate radiometry with an uncertainty level that is lower than 0.03%. The EMIS, which is used to measure the spectrum radiance on the reflected solar band, is designed to optimize the signal-to-noise ratio and polarization. The radiometric scale of the SCAR is converted and transferred to the EMIS by the BTC to improve the measurement accuracy and long-term stability. The payload of the radiometric benchmark on the reflected solar band has been under development since 2018. The investigation results provide the theoretical and experimental basis for the development of the reflected solar band benchmark payload. It is important to improve the measurement accuracy and long-term stability of space remote sensing and provide key data for climate change and earth radiation studies.

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