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Based on the requirements of the research topic of using sound signals to measure continuous ground fried point technology, the paper analyzes the characteristics of continuous projectile burst acoustic signals in complex background, and studies a multi-target signal delay estimation technique suitable for the actual measurement environment of the shooting range. The main steps are signal preprocessing, target recognition and time delay extraction. The computer simulation shows that the delay estimation accuracy of the algorithm can reach 1.2 milliseconds, and the adhesion signals with interval greater than main pulse width (about 10 milliseconds) can be correctly separated. The acoustic signals of the live projectile were collected by using the prototype developed by the research team, the test results verify the reliability and correctness of the algorithm, and the delay estimation error is consistent with the numerical simulation, which better solves the continuous ground-fired target time delay estimation problem in acoustic localization.