摘要
直接数字式频率合成 (DDS)作为一种新的频率合成技术,它可以实现从信号参数到信号波形的转换。在传统的线性调频连续波雷达测距系统中,通过三角波发生器对压控振荡源 (VCO)进行调制,输出线性调频连续波雷达(LFM CW)信号,但是压控振荡源的扫频非线性以及很低的频率分辨率对LFM -CW雷达的测距精度产生很大的影响。文中将直接数字式频率合成技术引入LFM -CW雷达,代替压控振荡源,很好的解决了该问题。FFT频谱分析用DSP实现,系统控制用单片机完成,终端采用液晶显示。
Direct digital synthesizer (DDS) is a kind of ne w frequency synthesizer technique. With it signal parameter can be switched int o signal wave. In the field of traditional linear FM-CW ranging, voltage contro lled oscillator(VCO) is modulated by triangle wave and outputs linear FM-CW sig nal, but the sweep nonlinearity and low frequency resolution of voltage controll ed oscillator(VCO) make great influence to the range precision of linear FM-CW radar. In this paper, the direct digital synthesizer(DDS) is used in linear FM- CW radar instead of voltage controlled oscillator, the problem is solved well. F FT algorithm is realized by DSP, and the system is controlled by singlechip and the terminal uses liquid crystal display(LCD).
出处
《现代雷达》
CSCD
北大核心
2005年第3期36-39,共4页
Modern Radar
