Abstract This paper presents a concurrent dual-band radar system for noncontact tracking of vital signs (e.g., respiration and heartbeat), and indoor short-range localization. The proposed sensor, which has been achieved with our own customized concurrent dual-band subsystems, operates at 1.67 and 2.06 GHz synchronously. Based on the Doppler principle, tiny vital signs are obtained by analysis of spectrum of the signals received at each individual frequency band. Moreover, the location of a target is estimated based on the phase difference between these two closely spaced frequencies. The azimuth information is obtained by beam scanning. Combining the results of range and azimuth information allows the radar system to plot two-dimensional maps. As a result, the proposed radar is capable of monitoring human’s life activities and tracking the location of individuals continuously. System-level experiments were carried out to reveal the versatile capability of the life activity monitoring system.

中文翻译：

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用于生命体征跟踪和短程定位的并发双波段雷达传感器

摘要 本文提出了一种用于非接触式跟踪生命体征（例如，呼吸和心跳）和室内短程定位的并发双频雷达系统。所提出的传感器是通过我们自己定制的并发双频子系统实现的，在 1.67 和 2.06 GHz 同步运行。基于多普勒原理，通过分析在每个单独频带上接收到的信号的频谱来获得微小的生命体征。此外，目标的位置是根据这两个间隔很近的频率之间的相位差来估计的。通过波束扫描获得方位角信息。结合距离和方位角信息的结果允许雷达系统绘制二维地图。因此，拟议的雷达能够监测人类的生活活动并持续跟踪个人的位置。进行了系统级实验以揭示生命活动监测系统的多功能能力。