低功耗水声接收机系统设计

为了接收水下目标回波,研究设计了一款低功耗水下接收机。由于信号发射功率和传播过程中强干扰噪声影响,信号发生衰减、畸变、混响等现象,致使接收机输入端信号动态范围较大,直接影响后端数字处理。系统采用硬件电路实现恒Q的多频率接收,并采用AGC实现大动态范围的压缩和相位幅度的一致性。考虑到所处环境,降低元器件功耗以及不工作时DSP处于关机状态,海试结果表明该系统能有效降低功耗,实现动态范围大、灵敏度高、一致性好等优点。

Design of low power acoustic receiver system

To get the echo beneath the water,we design a low power under-water receiver.Since there＇s noise on the way the signal transmitting,attenuation,aberration and reverberation happen to the original signal,which expanse the range of the dynamic signal receiving,leading to a bad result of the advanced digital signal processing.This system utilize hardware circuit with permanent Q multi-rate receiver,together with AGC to achieve the compressing of a big dynamic range and making phase margin all the same.Considering about the environment we are in,reducing the power dissipation and shut down the non-working DSP is necessary.The result of experiments shows that this system has the advantages such as reducing the power dissipation,expanding the dynamic range and having a high sensitivity and uniformity.