Arid
DOI10.1016/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
ISSN0094-5765
EISSN1879-2030
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
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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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