Aiming at the detection of weak echo signals, this paper introduces constraint judgment in the secondary threshold detection process. The improvement of the total false alarm probability and the impact on the total detection probability of constraint judgment are quantitatively analyzed, and a mathematical model of the total false alarm probability and total detection probability of secondary threshold detection based on constraint judgment is established, and the effectiveness of the model is verified by simulation. The simulation results show that the introduction of constraint judgment into secondary threshold detection can ensure that the requirements for signal-to-noise ratio are reduced under the condition that the total detection probability and the total false alarm probability meet the predetermined indicators.
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