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Journal of Information Science and Engineering, Vol. 24 No. 5, pp. 1397-1407 (September 2008)

A Self-adaptive Predictive Policy for Pursuit-evasion Game

Zhen Luo, Qi-Xin Cao and Yan-Zheng Zhao
Research Institute of Robotics
Shanghai Jiaotong University
Shanghai 200240, P.R. China

The proposed self-adaptive predictive pursuing policy consists of an action decision-making procedure and a procedure of adjusting the estimation of evader°¶s action preference. Since correct estimation of opponent°¶s intention would do good to win adversarial games, it introduces the conception of action preference to model opponent°¶s decision-making. Because evader often has different action preference in different situation, to model evader°¶s decision-making, pursuer has to divide the situation space into many categories and provide a set of estimation of evader°¶s action preference for each kind of situation. Pursuer adjusts the estimation of evader°¶s action preference in certain situation by observing evader°¶s action. Action decision-making procedure consists of situation sorting, possible future states computation, payoff evaluation and action selection. Action decision-making is based on the decision tree constructed by expected payoffs. Expected payoffs are integrated from single payoffs. Single payoffs are evaluated by gains of features reflecting adversarial situation. A simulation of middle size soccer robots has been carried out and illustrated that the proposed policy is effective.

Keywords: action preference, payoff function, predictive, pursuit-evasion games, self-adaptive

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Received November 24, 2006; revised March 1, 2007; accepted June 1, 2007.
Communicated by Takeshi Tokuyama.