CW and Pulse-Doppler Radar Processing Based on FPGA for Human Sensing Applications
CW and Pulse-Doppler Radar Processing Based on FPGA for Human Sensing Applications
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DOI：
10.1109/tgrs.2012.2217975
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发表时间：
2013-05-01
影响因子：
8.2
通讯作者：
Fathy, Aly E.
中科院分区：
文献类型：
--
作者：
Wang, Yazhou;Liu, Quanhua;Fathy, Aly E.
在本文中，我们讨论了使用现场可编程门阵列（FPGA）处理时域或频域信号在人体传感雷达的应用。一个示例将针对连续波（CW）多普勒雷达给出，另一个示例将针对超宽带（UWB）脉冲多普勒（PD）雷达给出。CW多普勒雷达的示例利用新型超外差接收机来抑制低频噪声，并包括在FPGA中实现的数字下变频器模块。同时，超宽带脉冲多普勒雷达采用了载波收发器和基于FPGA的等效时间采样方案实现窄脉冲数字化。高度集成的紧凑型数据采集硬件已经在两个雷达原型中实现和利用。通常，CW多普勒雷达是用于单个人类活动监测、生命体征检测等的低成本选项，其中不需要目标范围信息。同时，超宽带PD雷达在穿墙探测、多目标检测、实时目标跟踪等方面具有更高的性能，可以获得高分辨率的距离像和微多普勒特征。将详细讨论设计挑战、性能比较、优点和缺点。
In this paper, we discuss using field-programmable gate arrays (FPGAs) to process either time-or frequency-domain signals in human sensing radar applications. One example will be given for a continuous-wave (CW) Doppler radar and another for an ultrawideband (UWB) pulse-Doppler (PD) radar. The example for the CW Doppler radar utilizes a novel superheterodyne receiver to suppress low-frequency noise and includes a digital downconverter module implemented in an FPGA. Meanwhile, the UWB PD radar employs a carrier-based transceiver and a novel equivalent time sampling scheme based on FPGA for narrow pulse digitization. Highly integrated compact data acquisition hardware has been implemented and exploited in both radar prototypes. Typically, the CW Doppler radar is a low-cost option for single human activity monitoring, vital sign detection, etc., where target range information is not required. Meanwhile, the UWB PD radar is more advanced in through-wall sensing, multiple-object detection, real-time target tracking, and so on, where a high-resolution range profile is acquired together with a micro-Doppler signature. Design challenges, performance comparison, pros, and cons will be discussed in detail.