State Key Laboratory of Astronautic Dynamics;
Xi'an 7 10043;
China;
Northwest University School of Information and Technology;
Xi'an 710127;
China;
Air Defense and Antimissile Institute;
Air Force Engineering University;
Xi'an;
710051;
China;
intuitionistic fuzzy entropy; discrete particle swarm optimization algorithm; 0-1 knapsack problem; weapon target assignment;