摘要
给出一套宽带雷达信号源的设计方案,它由基带信号源和倍频链组成,产生中心频率为1GHz,带宽为800MHz的线性调频信号。基带信号源选用了AD公司高性能数字频率合成芯片AD9858,由FPGA实现加载DDS控制字,产生(200±50)MHz的基带信号。倍频链将基带信号进行上变频和倍频,可输出1GHz±400MHz的宽带雷达信号。经示波器和频谱仪测试显示,所设计的宽带雷达信号源满足设计要求。
A design scheme of a wideband radar signal source is given in the paper. It is composed of a baseband signal source and frequency multiplier chain. A linear FM signal is generated, whose center frequency is 1 GHz and bandwidth is 800 MHz. The baseband signal source selects high-performance digital frequency synthesizer chip AD9858 produced by AD, and DI）S control word is loaded by FPGA to generate （200±50）MHz baseband signal. Multiplier chain is used to carry out up-conversion and frequency doubling of the baseband signal so as to output wideband radar signal whose bandwidth is 1 GHz±400 MHz. The wide- band radar signals are tested through the oscilloscope and spectrum analyzer, and meet the design requirements.
出处
《现代电子技术》
2013年第3期21-24,共4页
Modern Electronics Technique
关键词
宽带雷达信号源
数字频率合成
线性调频信号
基带信号源
倍频链
AD9858
wideband radar signal source
direct digital synthesis （DDS）
linear frequency modulation （LFM）
basebandsignal source
frequency multiplier chain
AD9858
