AGC电路在深弹主动声近炸引信接收机中的应用

The Application of AGC to Receiver of Active Acoustic Proximity Fuze in Depth Charge

为了使深弹主动声近炸引信接收机准确地检测出回波信号,提高接收机的灵敏度,设计了深弹主动声近炸引信自动增益控制(AGC)系统。通过对检波后的回波信号进行采样,经过A/D变换,采样值送入单片机内部进行比较、判别、计算,然后输出可控制信号幅度的增益码去控制AGC电路的受控级,实现对回波信号的增益控制,从而使得输出信号幅值稳定在一个窗口内,供后续电路处理。试验结果表明,该电路工作稳定,效果良好,达到了系统设计要求。

For the receiver of active acoustic proximity fuze in depth charge detecting echo signal accurately, improving the sensitivity of receiver, this paper designs a automatic amplification control system of active acoustic proximity fuze in depth charge. By sampling echo signal demodulated and A/D transform, sampling value is transmitted to SCM for compare,division, calculation, and exporting gain code to control signal range;furthermore controlling the AGC circuit, realizing amplification control to echo signal, consequently stabilitate the signal range in a window for the later circuit. The re.st results show that the AGC circuit is well and achieve the require of system design.