globalchange  > 气候变化事实与影响
DOI: 10.3390/rs11070796
WOS记录号: WOS:000465549300061
论文题名:
RAVAN: CubeSat Demonstration for Multi-Point Earth Radiation Budget Measurements
作者: Swartz, William H.1; Lorentz, Steven R.2; Papadakis, Stergios J.1; Huang, Philip M.1; Smith, Allan W.2; Deglau, David M.1; Yu, Yinan2; Reilly, Sonia M.1,3; Reilly, Nolan M.1,3; Anderson, Donald E.1
通讯作者: Swartz, William H.
刊名: REMOTE SENSING
ISSN: 2072-4292
出版年: 2019
卷: 11, 期:7
语种: 英语
英文关键词: Earth radiation budget ; outgoing longwave radiation ; reflected solar radiation ; energy imbalance ; carbon nanotubes ; gallium black body ; CubeSat
WOS关键词: IMBALANCE
WOS学科分类: Remote Sensing
WOS研究方向: Remote Sensing
英文摘要:

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) 3U CubeSat mission is a pathfinder to demonstrate technologies for the measurement of Earth's radiation budget, the quantification of which is critical for predicting the future course of climate change. A specific motivation is the need for lower-cost technology alternatives that could be used for multi-point constellation measurements of Earth outgoing radiation. RAVAN launched 11 November 2016, into a nearly 600-km, Sun-synchronous orbit, and collected data for over 20 months. RAVAN successfully demonstrates two key technologies. The first is the use of vertically aligned carbon nanotubes (VACNTs) as absorbers in broadband radiometers for measuring Earth's outgoing radiation and the total solar irradiance. VACNT forests are arguably the blackest material known and have an extremely flat spectral response over a wide wavelength range, from the ultraviolet to the far infrared. As radiometer absorbers, they have greater sensitivity for a given time constant and are more compact than traditional cavity absorbers. The second technology demonstrated is a pair of gallium phase-change black body cells that are used as a stable reference to monitor the degradation of RAVAN's radiometer sensors on orbit. Four radiometers (two VACNT, two cavity), the pair of gallium black bodies, and associated electronics are accommodated in the payload of an agile 3U CubeSat bus that allows for routine solar and deep-space attitude maneuvers, which are essential for calibrating the Earth irradiance measurements. The radiometers show excellent long-term stability over the course of the mission and a high correlation between the VACNT and cavity radiometer technologies. Short-term variabilityat greater than the tenths-of-a-Watt/m(2) needed for climate accuracyis a challenge that remains, consistent with insufficient thermal knowledge and control on a 3U CubeSat. There are also VACNT-cavity biases of 3% and 6% in the Total and SW channels, respectively, which would have to be overcome in a future mission. Although one of the black bodies failed after four months, the other provided a repeatable standard for the duration of the project. We present representative measurements from the mission and demonstrate how the radiometer time series can be used to reconstruct outgoing radiation spatial information. Improvements to the technology and approach that would lead to better performance and greater accuracy in future missions are discussed.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/133196
Appears in Collections:气候变化事实与影响

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作者单位: 1.Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA
2.L 1 Stand & Technol, Manassas, VA 20109 USA
3.MIT, Dept Math, Cambridge, MA 02139 USA

Recommended Citation:
Swartz, William H.,Lorentz, Steven R.,Papadakis, Stergios J.,et al. RAVAN: CubeSat Demonstration for Multi-Point Earth Radiation Budget Measurements[J]. REMOTE SENSING,2019-01-01,11(7)
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