Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.actaastro.2016.04.004 |
Effect of satellite formations and imaging modes on global albedo estimation | |
Nag, Sreeja1,2; Gatebe, Charles K.3; Miller, David W.4; de Weck, Olivier L.5 | |
通讯作者 | Nag, Sreeja |
来源期刊 | ACTA ASTRONAUTICA
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ISSN | 0094-5765 |
EISSN | 1879-2030 |
出版年 | 2016 |
卷号 | 126页码:77-97 |
英文摘要 | We confirm the applicability of using small satellite formation flight for multi-angular earth observation to retrieve global, narrow band, narrow field-of-view albedo. The value of formation flight is assessed using a coupled systems engineering and science evaluation model, driven by Model Based Systems Engineering and Observing System Simulation Experiments. Albedo errors are calculated against bi-directional reflectance data obtained from NASA airborne campaigns made by the Cloud Absorption Radiometer for the seven major surface types, binned using MODIS’ land cover map water, forest, cropland, grassland, snow, desert and cities. A full tradespace of architectures with three to eight satellites, maintainable orbits and imaging modes (collective payload pointing strategies) are assessed. For an arbitrary 4-sat formation, changing the reference, nadir-pointing satellite dynamically reduces the average albedo error to 0.003, from 0.006 found in the static reference case. Tracking pre-selected waypoints with all the satellites reduces the average error further to 0.001, allows better polar imaging and continued operations even with a broken formation. An albedo error of 0.001 translates to 136 W/m(2) or 0.4% in Earth’s outgoing radiation error. Estimation errors are found to be independent of the satellites’ altitude and inclination, if the nadir-looking is changed dynamically. The formation satellites are restricted to differ in only right ascension of planes and mean anomalies within slotted bounds. Three satellites in some specific formations show average albedo errors of less than 2% with respect to airborne, ground data and seven satellites in any slotted formation outperform the monolithic error of 3.6%. In fact, the maximum possible albedo error, purely based on angular sampling, of 12% for monoliths is outperformed by a five-satellite formation in any slotted arrangement and an eight satellite formation can bring that error down four fold to 3%. More than 70% ground spot overlap between the satellites is possible with 0.5 of pointing accuracy, 2 Km of GPS accuracy and commands uplinked once a day. The formations can be maintained at less than 1 m/s of monthly Delta V per satellite. (C) 2016 IAA. Published by Elsevier Ltd. All rights reserved. |
英文关键词 | Small satellite Formation flight Cubesat BRDF Multi-angular Remote sensing Constellation |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000382412200011 |
WOS关键词 | AIRBORNE SPECTRAL MEASUREMENTS ; SURFACE ; CONSTELLATION ; MISSION ; OCEAN |
WOS类目 | Engineering, Aerospace |
WOS研究方向 | Engineering |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/190915 |
作者单位 | 1.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 2.Bay Area Environm Res Inst, Petaluma, CA USA; 3.Univ Space Res Org, NASA, Goddard Space Flight Ctr, Columbia, MD USA; 4.MIT, NASA Headquarters, Cambridge, MA 02139 USA; 5.MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA |
推荐引用方式 GB/T 7714 | Nag, Sreeja,Gatebe, Charles K.,Miller, David W.,et al. Effect of satellite formations and imaging modes on global albedo estimation[J],2016,126:77-97. |
APA | Nag, Sreeja,Gatebe, Charles K.,Miller, David W.,&de Weck, Olivier L..(2016).Effect of satellite formations and imaging modes on global albedo estimation.ACTA ASTRONAUTICA,126,77-97. |
MLA | Nag, Sreeja,et al."Effect of satellite formations and imaging modes on global albedo estimation".ACTA ASTRONAUTICA 126(2016):77-97. |
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