主动声纳方程和传播损失及混响级的定义

The active sonar equation and the definitions of propagation loss and reverberation level

A.Ainslie发表文章指出传统定义的被动声纳方程严格应用起来与实际情况存在一定的偏差,某些情况下会带来严重的错误。该偏差需通过接收水听器与声源处介质的特征阻抗比来校正。主动声纳方程中存在同样的问题,其与实际情况的偏差需要用接收水听器与声源处的介质特征阻抗比的平方来校正。本文给出主动声纳方程中传播损失和混响级的重新定义,并且给出相应的两种主动声纳方程,两种方程都消除了这种不期望的特征阻抗比偏差。

A. Ainslie pointed out that a rigorous application of the traditional definition of passive sonar equation leads to the appearance of an extra factor which equals to the ratio of the characteristic impedance at the receiver to that at the source. This extra factor can lead to a non-negligible error in certain applications. The active sonar equation has the same behavior where this unwanted factor is square of the ratio of the sound impedance at the receiver to that at the source. New definitions of the propagation loss and the reverberation level are proposed here. Two alternatives to the traditional active sonar equations are suggested, both of which eliminate the unwanted impedance ratio.