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A quadri-threshold radar-to-ESM correlation algorithm is presented and the corresponding four thresholds (high threshold, middle threshold, low threshold, and threshold margin) are given. The proposed algorithm is especially suited for the scenarios where each radar track is specified by different numbers of measurements. Using a simple and effective discriminant function based on the fuzzy synthesis function, the proposed quadri-threshold radar-to-ESM correlation algorithm first selects the two most likely radar tracks and then makes the soft decision based on the selected two tracks. The introduction of the threshold margin in the presented algorithm can further reduce mis-classification errors. Simulation results show the feasibility of the algorithm.