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。
To higher the ranging accuracy, first of all, a bigger array aperture is required to effectively estimate the range of target far away.
为了实现目标的全程测距，首先要求接收阵的孔径应较大，以实现对远程目标距离的有效估计。
To higher the ranging accuracy, first of all, a bigger array aperture is required to effectively estimate the range of target far away.
为了实现目标的全程测距，首先要求接收阵的孔径应较大，以实现对远程目标距离的有效估计。
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