一种新颖的自动频率控制系统  

A Novel Automatic Frequency Control System

作　　者：郑生华[1] 王冰[1] 弋稳[1] 

机构地区：[1]华东电子工程研究所,合肥230031

出　　处：《现代电子》2001年第2期46-49,共4页

摘　　要：提出了一种新颖的基于低通滤波控制特性的AFC系统。用低通滤波器的过渡带代替传统的中频鉴频器的鉴频特性曲线,把由各种因素造成的发射机频率不稳的频率偏差转化为符号函数,结合DDS技术,形成一种新颖的具有宽频率跟踪范围的AFC系统。A novel AFC system based on low-pass filter property is presented in this paper. Replacing the characteristic curve of IF frequency discriminator with the transition band of low-pass filter,converting the frequency shift error of the transmitter caused by different uncertainties to sign function by the comparator, and adopting the DDS technique,the novel AFC system with a wide frequency-tracking range is formed.

关 键 词：雷达接收机 低通滤波器 自动频率控制系统 

分 类 号：TN957.5[电子电信—信号与信息处理]