摘要
模拟信号的采集及处理技术是一项应用广泛的技术,但在一些特殊领域对信号的采集精度要求较高,要求尽量将其幅值控制在合理范围内,即小信号尽量放大而大信号尽量不削波,才能保证所采集的信号信噪比高且不失真,这是固定增益无法做到的。为此,论文提出了一种快速自动增益控制方案,利用模糊控制适用于非线性、不确定性系统的特点,同时设计了超限检测功能,能够对信号突变导致的超限及时反应,从而保证了论方案能够实时地根据信号强度快速改变增益,有效地解决了这一问题。实验结果表明,论文提出的快速自动增益控制方案效果良好。
Analog signal acquisition and processing has been applied widely,but high signal acquisition precision is demanded in some special field.The signal amplitude is required to be controlled within reasonable limits,that is,small signal should be amplified to improve noise ratio and big signal should be reduced to avoid clipping distortion,thus the high noise ratio and signal integrity can be ensured.The fixed-gain signal acquisition system can’t meet the qualification.For this reason,this paper proposes a fast automatic gain control project,which adopts fuzzy control for its feature of applying to nonlinear and uncertain system,at the same time,the function of overrun detection is designed to ensure fast reaction for signal mutation,thus this project can change gain according to signal intensity,consequently,this problem is resolved effectively.The experimental results show that this project possesses good effect.
出处
《舰船电子工程》
2016年第7期142-145,共4页
Ship Electronic Engineering
关键词
模拟信号采集
自动增益
模糊控制
analog signal acquisition
automatic gain
fuzzy control
