Passive sonar system detects and judges the target which is based on radiate noise of the target. Line spectrum detection is distinguishing line spectrum of the radiate noise from broad band noise, and detects the sonar target accurately.
被动声纳是根据目标航行时发出的辐射噪声来检测目标并判别目标类型的，被动声纳的线谱检测就是要将舰船辐射噪声的线谱分量从宽带背景噪声中提取出来，以实现对声纳目标的正确检测。
参考来源 - 被动声纳系统中低频信号的检测技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A crucial issue in a passive sonar system is detection of the spectral lines.
在被动声纳系统中，线谱检测是一个至关重要的问题。
Detections of the spectral lines is an important issue in the passive sonar system.
在被动声纳系统中，线谱检测是一个至关重要的问题。
In the vector sensor array based passive sonar system, it is necessary to track multiple targets automatically.
在矢量阵被动声呐系统中，需要对多目标进行自动跟踪。
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