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A Mathematical Model for the Calculation on the Target Strength of the Anti-Submarine Warfare Trainer (ASWT)

As the anti-submarine warfare trainer (ASWT) performs the detection search for the underwater targets, the sonar equation is used to determine whether or not the signal excess reflected from such targets is greater than the level of the detection threshold, which is an index of the quality involved with the equipment and the recognition capability of the sonar soldiers. The target strength is one of the parameters of the sonar equation. Experimental results have shown that its level value is based upon the shape, size, and material property of the target as well as the aspect of the incident angle of the sonar wave to the targets. Therefore, to make use the interpolation method to find out the target strength is a necessary and important intermediate process for the ASWT to simulate the detection search behavior. The object of this paper is to build a mathematical model of the target strength so that it could be applied to the active sonar system for the detection purpose of the ASWT. On the mathematical model as proposed by this paper, one uses the curve fitting method to replace the butterfly plot so that it can reach the goal of real-time calculation requirement in the evaluation for the target strength of the underwater targets.