基于锁相环路技术的二次雷达信号发生器设计  

Design of secondary radar signal generator based on phase-locked loop technology

作　　者：杜海龙 段照斌 王伯阳 Du Hailong;Duan Zhaobin;Wang Boyang(Engineering Technology Training Center,Civil Aviation University of China,Tianjin 300300,China;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学工程技术训练中心,天津300300 [2]中国民航大学航空工程学院,天津300300

出　　处：《电子技术应用》2020年第12期134-138,143,共6页Application of Electronic Technique

摘　　要：为了满足实验室教学与研究的需求,基于锁相环路技术设计了一款二次雷达信号发生器,实现了700 MHz^1100 MHz范围内的频率合成。首先,对锁相环路频率合成原理进行分析,设计实现了三阶无源环路滤波器,滤除鉴相器产生的高频分量,并与锁相环芯片ADF4350构成锁相环控制回路。其次,利用仿真工具软件ADI simPLL,对锁相环路进行仿真,得到环路滤波器的参数和仿真输出特性。最后,搭建二次雷达信号发生器系统,并利用SPSS软件对系统输出进行分析,结果表明,在1 GHz-1.1 GHz频带范围内系统偏差小于0.02 MHz且为固定偏差,经过补偿后系统精度能很好地满足实验室教学与研究的需求。In order to meet the needs of laboratory teaching and research,based on phase-locked loop technology,this paper designed a secondary radar signal generator,to achieve the 700 MHz〜1100 MHz range of frequency synthesis.Firstly,the principle of frequency synthesis of phase-locked loop is analyzed,and the third-order passive loop filter is designed and realized.The high-frequency components generated by phase detector are filtered out and the phase-locked loop control circuit is formed with phase-locked loop chip ADF4350.Secondly,using the simulation tool ADI simPLL,the phase-locked loop is simulated and the parameters of the loop filter and the simulation output are obtained.Finally,the secondary radar signal generator system is built and the system output is analyzed by SPSS software.The results show that the system deviation is less than 0.02 MHz and the fixed deviation is in the range of 1 GHz^1.1 GHz band.After the compensation,system accuracy can be meet the needs of laboratory teaching and research well.

关 键 词：二次雷达 信号发生器 锁相环路 频率合成 

分 类 号：TN836[电子电信—信息与通信工程]