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提出一种中心频率为3 GHz单天线近距宽带调频连续波雷达的实现方法,设计了射频单元和中频信号处理电路.采用槽形结构的微带天线并利用微带威尔金森功分器取代传统的环行器双工结构,实现了雷达的宽带应用;通过Blackman加窗的方法对差拍信号进行FFT处理,抑制了天线端口的反射以及发射泄露信号的影响.实验结果表明,该新型近距调频连续波雷达方案是可行的.
A 3GHz single-antenna short-range broadband frequency-modulated continuous-wave radar with a center frequency of 3 GHz is proposed, and a radio frequency unit and an intermediate frequency signal processing circuit are designed. The slot-shaped microstrip antenna is used and replaced by a microstrip Wilkinson power splitter The traditional duplexer structure of the circulator realizes the wideband application of the radar. The FFT processing of the beat signal by the method of Blackman windowing suppresses the reflection of the antenna port and the influence of transmitting the leakage signal. The experimental results show that the new close- FM continuous wave radar program is feasible.