A Digital Automatic Gain Control Method for Acoustic Receiver
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摘要: 为了克服信号功率、距离、传播过程介质衰减等因素对水中兵器引信动作的影响, 常需要使用自动增益控制（AGC）技术对信号幅度动态范围进行压缩。本文提出了一种基于统计信号幅值过门限次数的AGC控制方法, 分析了幅值检测原理, 并针对接收噪声对AGC控制误差的影响, 提出了AGC控制统计门限优化选取方法, 为AGC控制提供了一种新思路。该方法已应用于水声信号接收机系统, 应用结果表明, 该方法具有控制精度高、抗噪声干扰能力强等优点。Abstract: To suppress the effects of signal power, distance, and medium attenuation in propagation on the fuze action of underwater weapon, automatic gain control(AGC) is necessary for narrowing the dynamic scope of signal amplitude. We proposed an AGC method based on the number of signal amplitude over threshold, and analyze the principle of signal amplitude detection in this paper. To eliminate the influence of receiver noise on AGC errors, we presented a way to optimize the threshold selection. Application of our method to an underwater acoustic receiver system demonstrates its high control precision and anti-interference performance.
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