An Improved Method for Evaluation the Submarine Searching Effectiveness with Extension Spiral Array of Dipping Sonar

Aiming at the problem that the detection range is equivalent to a circle with fixed radius in the evaluation process of submarine search effectiveness of anti-submarine helicopter dipping sonar, this paper establishes a detection range model of sonar based on the extension spiral array mathematical model of sonar in order to improve the fidelity of effectiveness evaluation. Based on the ray acoustics theory model, the negative-gradient acoustic velocity in deep sea is taken for example to obtain the relationship between the detection range of the dipping sonar and the temperature as well as the depth curve via BELLHOP simulation, and it is found that dipping sonar detection range in real case is subject to change with the velocity gradient. Furthermore, aiming at the problem of submarine navigation along a straight line in escape process, this paper establishes a submarine elusion model, and obtains the simulation diagram of the submarine elusion. The model of the detection range equivalent to a fixed circle with radius is named as the first model. The first model with the addition of the detection range model is called the second model, and the second model with the addition of the submarine elusion model is called the third model. The Monte Carlo method is used to simulate the three models for 5 000 times, respectively. The results show that the detection range model with ray acoustics theory and the submarine elusion model greatly reduce the efficiency of submarine searching. Through simulation analysis, the goal of improving the fidelity of the effectiveness evaluation of sonar array search is achieved.