摘要
数字技术已经成为现代雷达普遍采用的波形合成方法,采用直接数字频率合成(DDS)产生线性调频信号及其 他复杂信号的技术日益受到重视。对DDS性能及杂散分布规律进行了分析讨论,详细介绍了AD公司直接频率合成芯片 AD9854的主要功能及其关键参数的设计方法,最后给出一种新颖的基于FPGA和双片DDS的应用实例设计引入了雷 达回波信号模拟模块的LFMCW雷达波形产生器,该系统可用于雷达内部功能模拟测试,最后对该系统进行了性能测试及 结果分析。
The digital technology is a kind of waveform synthesis is widely used in radar systems, and the DDS method, which can generate LFM signal and arbitrary complicated waveform is attached importance increasingly. This paper analyzes the principle and output noise of the DDS, introduces the performance and parameter design of DDS chipAD9854 in detail. Then presents a novel application example the LFMCW radar waveform generator includes simulated radar echo generator system base on FPGA and two pieces of DDS, which can be used in radar interior function testing. At last analyzes the test result.
出处
《现代电子技术》
2005年第7期28-30,共3页
Modern Electronics Technique
