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Dilution-of-Precision-Based Lunar Surface Navigation System Analysis Utilizing Earth-Based AssetsThe NASA Vision for Space Exploration is focused on the return of astronauts to the Moon. Although navigation systems have already been proven in the Apollo missions to the Moon, the current exploration campaign will involve more extensive and extended missions requiring new concepts for lunar navigation. In contrast to Apollo missions, which were limited to the near-side equatorial region of the Moon, those under the Exploration Systems Initiative will require navigation on the Moon's limb and far side. These regions are known to have poor Earth visibility, but unknown is the extent to which a navigation system comprised solely of Earth-based tracking stations will provide adequate navigation solutions in these areas. This report presents a dilution-of-precision (DoP)-based analysis of the performance of a network of Earth-based assets. This analysis extends a previous analysis of a lunar network (LN) of navigation satellites by providing an assessment of the capability associated with a variety of assumptions. These assumptions pertain to the minimum provider elevation angle, nadir and zenith beam widths, and a total single failure in one of the Earth-based assets. The assessment is accomplished by making appropriately formed estimates of DoP. Different adaptations of DoP, such as geometrical DoP and positional DoP (GDoP and PDoP), are associated with a different set of assumptions regarding augmentations to the navigation receiver or transceiver.
Document ID
20070014484
Acquisition Source
Glenn Research Center
Document Type
Technical Publication (TP)
Authors
Welch, Bryan W.
(NASA Glenn Research Center Cleveland, OH, United States)
Connolly, Joseph W.
(NASA Glenn Research Center Cleveland, OH, United States)
Sands, Obed S.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
February 1, 2007
Subject Category
Launch Vehicles And Launch Operations
Report/Patent Number
E-15686
NASA/TP-2007-214407
Funding Number(s)
WBS: WBS 439432.07.04.03.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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