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arXiv 1002.0013math.OCmath.CO
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基于半定表示和人脸约简的显式传感器网络定位

Explicit Sensor Network Localization using Semidefinite Representations and Facial Reductions

Nathan Krislock, Henry Wolkowicz

摘要:

传感器网络定位,SNL,嵌入维r的问题,包括定位无线传感器的位置,只给出无线电范围内的传感器之间的距离和传感器的一个子集(称为锚)的位置。目前的解决方法是利用欧氏距离矩阵和半定矩阵之间的线性映射,将该问题转化为加权最近半定规划问题(SDP)。由此产生的SDP解决使用原始-对偶内点求解器,产生一个昂贵的和不精确的解决方案。这种松弛是高度退化的意义上的可行集被限制到SDP锥的低维面,这意味着斯莱特约束规格失败。SNL问题的图中的团引起SDP松弛中的这种退化。在本文中,我们利用斯莱特约束规格的情况下,并推导出一种技术的SNL问题,与确切的数据,明确地解决了相应的秩限制SDP问题。不使用SDP解算器。对于随机生成的实例,我们能够有效地解决这个NP难问题的许多巨大的实例,以高精度,通过找到一个表示的SDP锥,包含SDP矩阵表示的EDM的最小面。我们的算法的主要工作包括在反复寻找代表的SDP锥,对应于集团的SNL问题的面的子空间的交集。

英文摘要:

The sensor network localization, SNL, problem in embedding dimension r, consists of locating the positions of wireless sensors, given only the distances between sensors that are within radio range and the positions of a subset of the sensors (called anchors). Current solution techniques relax this problem to a weighted, nearest, (positive) semidefinite programming, SDP, completion problem, by using the linear mapping between Euclidean distance matrices, EDM, and semidefinite matrices. The resulting SDP is solved using primal-dual interior point solvers, yielding an expensive and inexact solution. This relaxation is highly degenerate in the sense that the feasible set is restricted to a low dimensional face of the SDP cone, implying that the Slater constraint qualification fails. Cliques in the graph of the SNL problem give rise to this degeneracy in the SDP relaxation. In this paper, we take advantage of the absence of the Slater constraint qualification and derive a technique for the SNL problem, with exact data, that explicitly solves the corresponding rank restricted SDP problem. No SDP solvers are used. For randomly generated instances, we are able to efficiently solve many huge instances of this NP-hard problem to high accuracy, by finding a representation of the minimal face of the SDP cone that contains the SDP matrix representation of the EDM. The main work of our algorithm consists in repeatedly finding the intersection of subspaces that represent the faces of the SDP cone that correspond to cliques of the SNL problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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