基于双源IR-UWB生物雷达的强反射杂波抑制

Suppression of Strong Clutter Based on the Dual-Frequency IR-UWB Bioradar

在基于生物雷达的生命探测技术研究中,强反射杂波干扰对雷达回波的信噪比影响十分重要,普通的信号处理方法很难将其去除,从而使雷达系统发生误判或者漏判。本文在现有超宽带生物雷达技术的基础上,提出了一种基于双源IR-UWB生物雷达的强反射杂波抑制方法。利用两种不同中心频率的天线同时进行探测,首先对不同频率雷达回波信号分别进行通道内处理,实现人体微弱生命信号的增强;然后进行通道间处理,并采用自适应杂波消除技术抑制雷达回波中的强反射杂波干扰。在穿透砖墙和废墟两种不同场景下进行实验,结果表明本文所提出的方法可以明显提高雷达探测的准确率。

In the study of life detection based on bioradar, strong clutter has a very important influence onthe signal-to-noise ratio of radar echo. And it is difficult to be removed by using traditional signal processingmethods, so that false alarm or missing result usually occurs in the complex environment. In the light of existingultra-wideband （UWB） radar technology, this paper put forward a suppression method of strong clutter basedon the dual-frequency IR-UWB radar, which could detect target at the same time by using two pairs of antennaswith different center frequencies. At first, the radar echo signal was respectively processed in different channelsto enhance the weak vital signal of human. Then in order to suppress the interference of strong clutters, thedata of two channels were processed together with adaptive clutter elimination technology. Experiments wereconducted in two different scenarios of brick wall and simulation ruins, and the results showed that the accuracyof radar detection could be significantly improved by using the method proposed in this paper.