被动声呐也叫噪声声呐，它是通过接受和处理水中目标发出的辐射噪声或声呐信号，从而获取目标参数的各种声呐的统称。
研究结果可以用于被动声呐目标识别。
The research results can be applied to the passive sonar target recognition.
在矢量阵被动声呐系统中，需要对多目标进行自动跟踪。
In the vector sensor array based passive sonar system, it is necessary to track multiple targets automatically.
随着舰船噪声的降低，对被动声呐的检测性能提出了巨大的挑战。
Along with the decreasing noise radiation of underwater vessels, it appears a big challenge to the passive sonar.
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