In this study, a bio-radar system has been constituted using a frequency modulated continuous wave (FMCW) radar with low cost and limited bandwidth, taking into account of the lack of range the continuous wave (CW) radar. The displacement and vibration frequencies have been determined at a distance of 3.5–5 m for single and multiple targets via the help of the target test mechanism. Then, the detection of vital signs has been achieved with healthy human subject measurements. For a single human subject, respiration rate (RR) errors at 3.5 m and 5 m distances are 4% and 4.42%, respectively, and 13.25% and 15.16% for heartbeat rate (HR). In multiple targets measurements, although targets do not create an obstacle to each other, a slight deterioration has been observed in the signals and the error rates increase. The results show that bio-radar have a promising future to replace contact devices in medical applications.

中文翻译：

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低成本和有限带宽 FMCW 生物雷达的综合研究：生命体征测量的详细分析

在这项研究中，考虑到连续波（CW）雷达的射程不足，使用低成本和有限带宽的调频连续波（FMCW）雷达构成了生物雷达系统。在目标测试机构的帮助下，已经确定了单个和多个目标在 3.5-5 m 距离处的位移和振动频率。然后，通过健康的人类受试者测量实现了生命体征的检测。对于单个人类受试者，3.5 m 和 5 m 距离处的呼吸率 (RR) 误差分别为 4% 和 4.42%，心跳率 (HR) 为 13.25% 和 15.16%。在多目标测量中，虽然目标之间不会形成障碍，但在信号中观察到了轻微的劣化并且错误率增加了。