一种AGC控制的低噪声水声接收机

Low-noise acoustic receiver of automatic gain control

在深水隔水管监测系统上,为了接收水下节点发射的信号,研究设计了一款低噪声低功耗水下接收机。在海洋环境下,由于发射机发射功率,传播损失以及传播过程中噪声干扰等影响,造成接收信号畸变、衰减、动态范围增大等问题,不利于后端数字处理。本系统选择低噪声芯片,优化电路结构、降低系统噪声,通过六阶椭圆滤波器,选择所需频带信号通过,采用AGC实现大动态范围的压缩。海试结果显示,该系统具有高灵敏度、低噪声、低功耗、接收动态范围大等优点。

In order to receive signals emitted underwater nodes by deepwater riser monitoring system, we design a lownoise and low-power underwater receiver. In the environment of marine, the transmission power of the transmitter due to propagation loss and propagation of noise interference, resulting in distortion of the received signal, attenuation, and dynamic range increases other issues. These are not conducive to the back-end digital processing. The system selects the low-noise chips to reduce system noise by sixth-order elliptic filter, select the desired frequency band signal by using AGC achieve a large dynamic range compression. The results of experiments in the sea show that the system is a high sensitivity, low noise, low power consumption and big receiver dynamic range system.