本实用新型结构的导流罩对于改善声呐工作环境，提 高声呐作用距离具有重要意义。
The dome of the utility model has important significance on improving working environment of sonar and increasing working distance of sonar.
围绕声呐方程，论证了相关计程仪设计时应考虑的一些问题，如频率的选取，作用距离的估计等。
Some problems, such as the choice of frequency, estimation of the distance and so on, are discussed according to sonar equation, which should be considered in designing an acoustic correlation log.
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