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v2010.10.26 - Convex Optimization

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4.4. RANK-CONSTRAINED SEMIDEFINITE PROGRAM 3291.210.80.60.40.20−0.2−0.2 0 0.2 0.4 0.6 0.8 1 1.2Figure 97: Typical solution for 100 randomized sensors with noise factorη = 0.1 ; worst measured average sensor error ≈ 0.0044 compares better thanCarter & Jin’s 0.0154 computed in 0.71s [72, p.19]. Ten red vertical middlenodes are anchors; same as before. Remaining nodes are sensors. Interioranchor placement makes localization difficult. Radio range of sensor at originindicated by arc; radius = 0.25 . Actual sensor indicated by target whileits localization is indicated by bullet • . After 1 iteration rankG=92,after 2 iterations rankG=4. Rank-2 solution found in 3 iterations (752)(1700a). (Regular lattice in Figure 95 is actually harder to solve, requiringmore iterations.) Runtime for SDPT3 [348] under cvx [167] is a few minuteson 2009 vintage laptop Core 2 Duo CPU (Intel T6400@2GHz, 800MHz FSB).

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