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v2007.09.13 - Convex Optimization

v2007.09.13 - Convex Optimization

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262 CHAPTER 4. SEMIDEFINITE PROGRAMMING5 763 841 92Figure 64: 3-lattice in R 2 , hand-drawn. Nodes 7, 8, and 9 are anchors;remaining nodes are sensors. Radio range of sensor 1 indicated by arc.accuracy) while zero distance is denoted 0. Because measured distancesare quite unreliable in practice, our solution to the localization problemsubstitutes a distinct range of possible distance for each measurable distance;equality constraints exist only for anchors.Anchors are chosen so as to increase difficulty for algorithms dependenton existence of sensors in their convex hull. The challenge is to find a solutionin two dimensions close to the true sensor positions given incomplete noisyintersensor distance information.0 • • ? • ? ? • •• 0 • • ? • ? • •• • 0 • • • • • •? • • 0 ? • • • •• ? • ? 0 • • • •? • • • • 0 • • •? ? • • • • 0 ◦ ◦• • • • • • ◦ 0 ◦• • • • • • ◦ ◦ 0(636)

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