高频脉冲雷达信号源的设计与实现  

Design and Realize of RF Signal Sources in High-Frequency Pulse Radar

作　　者：朱正平[1] 李宁丽[1] 陈锟[1] 蓝加平[1] 

机构地区：[1]中南民族大学电子信息工程学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2011年第1期75-79,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：湖北省自然科学基金重点资助项目(2010CDA062);国家科技基础性专项重点资助项目(2008FY120100)

摘　　要：采用直接数字频率合成(DDS)技术,设计实现了一种基于单片机控制,以DDS芯片AD 9959为核心的高频脉冲雷达射频信号源.系统由C 8051单片机对输入控制字进行处理,从而执行对AD 9959芯片串行控制编程,产生所需的频率、相位和幅度精准的4路高频脉冲雷达信号源,并在其输出级设计了4路低通滤波器以减少串扰和杂散波,保证输出信号的频谱纯净度.该信号源已应用在电离层高频脉冲雷达探测系统中,现场实验结果表明,该信号源系统产生的高频信号频率稳定度高,扫频转换时间短,相位调制精确,且适合于多种编码方式,完全满足高频脉冲雷达对信号源的性能指标和技术要求.According to the technical demand of direct digital synthesizer（DDS）,in this paper we designed and realized four signal sources for high-frequency pulse radar based on the core chip AD9959,which is controlled by C8051 microcomputer. The C8051 MCU is adopted to process the input control word and then program AD9959 to produce the desired four signal sources with high precision of frequency,phase and amplitude in high-frequency pulsed radar.In addition,four low-pass filters were designed to reduce crosstalk and clutter,ensuring the output signal of good spectral purity.The signal sources have been applied in the Ionosonde of high-frequency pulse radar,and the experimental results showed that the RF signal sources had several advantages such as high frequency stability,fast scan switching speed,precise modulation of phase,and suitable for a variety of encoding,which fully meet the techinical requirements and performance index of the signal sources in high-frequency pulse radar.

关 键 词：直接数字频率合成 芯片AD9959 高频脉冲雷达 低通滤波器 

分 类 号：N945[自然科学总论—系统科学]