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Solving the moving target search problem using indistinguishable searchers

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  • Bourque, François-Alex

Abstract

Searching for a single target in a discrete space and time is a well-known problem in military operational research that also finds applications in other areas such as search and rescue. Solving this problem is difficult, as search routes depend on the knowledge of where the target may be at a given time, which itself changes as the search proceeds. It is even more so for multiple searchers, as the size of the state space now depends on the number of searchers. This contribution deals with this problem variant for a single moving target by assuming that searchers are not only identical, but also indistinguishable. In the standard branch and bound approach to this problem, this assumption permits the calculation of bounds by solving minimum-cost flow problems, which are independent of the number of searchers and where there is no need to relax the integrality of the search effort. Both of these outcomes are novel in comparison to previous efforts with multiple searchers. The author illustrates the proposed approach in the context of a counter-piracy scenario where warships aim to deter and interdict pirates and where the pirate motion model derives from an environmental forecast of the likelihood of piracy and the Markov assumption. Computational experiments are performed to compare the proposal to an alternative found in the literature to solve the problem to optimality.

Suggested Citation

  • Bourque, François-Alex, 2019. "Solving the moving target search problem using indistinguishable searchers," European Journal of Operational Research, Elsevier, vol. 275(1), pages 45-52.
  • Handle: RePEc:eee:ejores:v:275:y:2019:i:1:p:45-52
    DOI: 10.1016/j.ejor.2018.11.006
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    References listed on IDEAS

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    1. James N. Eagle & James R. Yee, 1990. "An Optimal Branch-and-Bound Procedure for the Constrained Path, Moving Target Search Problem," Operations Research, INFORMS, vol. 38(1), pages 110-114, February.
    2. Robert F. Dell & James N. Eagle & Gustavo Henrique Alves Martins & Almir Garnier Santos, 1996. "Using multiple searchers in constrained‐path, moving‐target search problems," Naval Research Logistics (NRL), John Wiley & Sons, vol. 43(4), pages 463-480, June.
    3. Lau, Haye & Huang, Shoudong & Dissanayake, Gamini, 2008. "Discounted MEAN bound for the optimal searcher path problem with non-uniform travel times," European Journal of Operational Research, Elsevier, vol. 190(2), pages 383-397, October.
    4. K. E. Trummel & J. R. Weisinger, 1986. "Technical Note—The Complexity of the Optimal Searcher Path Problem," Operations Research, INFORMS, vol. 34(2), pages 324-327, April.
    5. James N. Eagle, 1984. "The Optimal Search for a Moving Target When the Search Path Is Constrained," Operations Research, INFORMS, vol. 32(5), pages 1107-1115, October.
    6. Johannes O. Royset & Hiroyuki Sato, 2010. "Route optimization for multiple searchers," Naval Research Logistics (NRL), John Wiley & Sons, vol. 57(8), pages 701-717, December.
    7. Alan R. Washburn, 1998. "Branch and bound methods for a search problem," Naval Research Logistics (NRL), John Wiley & Sons, vol. 45(3), pages 243-257, April.
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    1. Delavernhe, Florian & Jaillet, Patrick & Rossi, André & Sevaux, Marc, 2021. "Planning a multi-sensors search for a moving target considering traveling costs," European Journal of Operational Research, Elsevier, vol. 292(2), pages 469-482.

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