eprintid: 467 rev_number: 4 eprint_status: archive userid: 5 dir: disk0/00/00/04/67 datestamp: 2011-03-25 lastmod: 2013-07-01 09:34:36 status_changed: 2013-07-01 09:34:36 type: techreport metadata_visibility: show item_issues_count: 0 creators_name: Rocca, Paolo creators_name: Manica, Luca creators_name: Massa, Andrea title: An Improved Excitation Matching Method based on an Ant Colony Optimization for Suboptimal-Free Clustering in Sum-Difference Compromise Synthesis ispublished: pub subjects: TU full_text_status: public keywords: Sum and Difference Patterns Synthesis, Monopulse Antennas, Linear Arrays, Excitation Matching, Directed Acyclic Graph, Ant Colony Optimization abstract: Dealing with an excitation matching method, this paper presents a global optimization strategy for the optimal clustering in sum-difference compromise linear arrays. Starting from a combinatorial formulation of the problem at hand, the proposed technique is aimed at determining the sub-array configuration expressed as the optimal path inside a directed acyclic graph structure modelling the solution space. Towards this end, an ant colony metaheuristic is used to benefit of its hill-climbing properties in dealing with the non-convexity of the sub-arraying as well as in managing graph searches. A selected set of numerical experiments are reported to assess the efficiency and current limitations of the ant-based strategy also in comparison with previous local combinatorial search methods. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. date: 2009-08 date_type: published institution: University of Trento department: informaticat refereed: TRUE referencetext: [1] D. A.McNamara, “Synthesis of sub-arrayed monopulse linear arrays through matching of independently optimum sum and difference excitations,” IEE Proc. H Microwaves Antennas Propag., vol. 135, no. 5, pp. 371-374, Oct. 1988. [2] T. T. Taylor, “Design of line-source antennas for narrow beam-width and low side lobes,” Trans. IRE, vol. AP-3, pp. 16-28, 1955. [3] C. L. Dolph, “A current distribution for broadside arrays which optimises the relationship between beam width and sidelobe level,” Proc. IRE, vol. 34, pp. 335-348, 1946. [4] E. T. 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