Ka波段小型化FMCW雷达低中频信号处理技术研究

摘要

For decrease the circuit size and cost of signal processing circuits,the low-intermediate frequency(IF) signal processing method is proposed that using the spectrum moving technique makes the frequency of the target under 20 kHz and reduces the A/D sampling rate. Test results of the target at 3.5 m obtain the distance frequency re⁃duction from 160 kHz to 10 kHz that verifies the proposed low-IF signal processing method can meet the miniatur⁃ized and low-cost radars application.%为了显著降低FMCW雷达后端数字信号处理电路的电路面积与电路成本，提出了低中频的设计思路，利用频谱搬移技术对目标信号进行下变频处理，使目标信号频率在20 kHz以下，相比直接对目标信号进行处理，A/D采样率得到减小，对3.5 m处的目标进行测试，测试结果得到目标频率从160 kHz有效的降低到了10 kHz，验证了低中频方法的可行性，满足小型化低成本雷达应用需求。