The acoustic channel in deep-sea convergence area has the advantage of long propagation range due to low propagation loss,which is of great significance for the realization of the near-surface source remote detection.In this paper,the multipath arrival time delay structure of the convergence area in deep sea is derived by the virtual source theory,and the approximate formulae of the time delay difference curves varying with the receiving depth are deduced.By analyzing the relationship between the time delay curves and the source range,a method for source ranging estimation in deep sea convergence area is proposed.The approach is demonstrated valid by the simulated data.Experimental results in the South China Sea shows that when the transmitting and receiving distance is between 42 km and 52 km,the range estimation results are in good agreement with the actual explosion range,and the estimation error is between 0.6％and 6.1％,which verifies the effectiveness of this method.
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万方数据