On optimal anchor node placement in sensor localization by optimization of subspace principal angles
Ash, J.N.
Moses, R.L.
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH;
This paper appears in: Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Publication Date: March 31 2008-April 4 2008
On page(s): 2289-2292
Location: Las Vegas, NV,
ISSN: 1520-6149
ISBN: 978-1-4244-1483-3
INSPEC Accession Number: 9973445
Digital Object Identifier: 10.1109/ICASSP.2008.4518103
Current Version Published: 2008-05-12
Abstract
In sensor network self-localization, anchor nodes provide a convenient means to disambiguate scene translation and rotation, thereby affording estimates in an absolute coordinate system. However, localization performance depends on the positions of the anchor nodes relative to the unknown-location nodes. Conventional wisdom in the literature is that anchor nodes should be placed around the perimeter of the network. In this paper, we show analytically why this strategy works well universally. We demonstrate that perimeter placement forces the information provided by the anchor constraints to closely align with the subspace that cannot be estimated from inter-node measurements: the subspace of translations and rotations. Examples quantify the efficacy of perimeter placement of anchors.
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