The system of passive ranging SONAR makes use of the target noise received by the equipment which converts energy from one form to another to estimate the target distance.
被动测距声纳系统是利用换能器基阵接收的目标辐射（噪声）信号来估计目标距离。
The research work of the dissertation includes the following two parts: researching the passive ranging technology and developing system hardware of the sonar pulse detection module.
本论文的研究工作分为两个部分：被动测距技术研究和声呐脉冲侦察模块系统硬件的研制。
The research work of the dissertation includes the following two parts: researching the passive ranging technology and developing system hardware of the sonar pulse detection module.
本论文的研究工作分为两个部分：被动测距技术研究和声呐脉冲侦察模块系统硬件的研制。
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