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v2007.09.13 - Convex Optimization

v2007.09.13 - Convex Optimization

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4.4. RANK-CONSTRAINED SEMIDEFINITE PROGRAM 2612314Figure 63: 2-lattice in R 2 , hand-drawn. Nodes 3 and 4 are anchors;remaining nodes are sensors. Radio range of sensor 1 indicated by arc.follows, we present the localization problem as a semidefinite program(equivalent to (634)) having an explicit rank constraint which controlsEuclidean dimension of an optimal solution. We show how to achieve thatrank constraint only if the feasible set contains a matrix of desired rank.Our problem formulation is extensible to any spatial dimension.proposed standardized testJin proposes an academic test in real Euclidean two-dimensional spaceR 2 that we adopt. In essence, this test is a localization of sensors andanchors arranged in a regular triangular lattice. Lattice connectivity issolely determined by sensor radio range; a connectivity graph is assumedincomplete. In the interest of test standardization, we propose adoptionof a few small examples: Figure 63 through Figure 66 and their particularconnectivity represented by matrices (635) through (638) respectively.0 • ? •• 0 • •? • 0 ◦• • ◦ 0(635)Matrix entries dot • indicate measurable distance between nodes whileunknown distance is denoted by ? (question mark). Matrix entrieshollow dot ◦ represent known distance between anchors (to very high

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