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PurposeIt is aimed to provide an efficient algorithm for path planning in guidance of autonomous unmanned aerial vehicle (UAV) through 3D terrain environments.Design/methodology/approachAs a stochastic search method, vibrational genetic algorithm (VGA) is improved and used to accelerate the algorithm for path planning.FindingsUsing VGA, an efficient path planning algorithm for autonomous UAV was obtained under low population rate and short generation cycle conditions.Originality/valueVGA decreased the required time for optimal path solution beside its simplicity. Low population rate and short generation cycle are the main benefits of VGA.