线性调频连续波(LFMCW)雷达回波的差拍中频信号包含探测目标的距离信息和多普勒信息,它们可以通过对差拍中频信号进行二维快速傅里叶变换分别得到。但是二维FFT处理距离副瓣高,距离分辨率差,不能有效地消除不同距离单元之间距离副瓣的相互影响。文中提出一种LFMCW雷达的主动测距技术,可以有效隔离距离副瓣,提高雷达的距离分辨率,实现主动方式测距。最后给出了实现方法和实验结果。

The range and Doppler information are included in the beat frequency of the linear frequency modulated continuous wave radar,and can be obtained by an two-dimensional fast Fourier transform(FFT).But the two-dimensional FFT processing which have the high range sidelobe and less range resolution still cannot reduce the interact of the different range units.A technique of initiative range measurement of LFMCW radar is put forward to reduce the influence of the range sidelobe and improve the range resolution effectively.The realization method and experiment results are provided in this paper.

TN953