DIMES, Università della Calabria, 87036 Rende, Italy.
Sensors (Basel). 2019 Jul 12;19(14):3085. doi: 10.3390/s19143085.
Non-contact wireless sensing approaches have emerged in recent years, in order to enable novel enhanced developments in the framework of healthcare and biomedical scenarios. One of these technologically advanced solutions is given by software-defined radar platforms, a low-cost radar implementation, where all operations are implemented and easily changed via software. In the present paper, a software-defined radar implementation with Doppler elaboration features is presented, to be applied for the non-contact monitoring of human respiration signals. A quadrature receiver I/Q (In-phase/Quadrature) architecture is adopted in order to overcome the critical issues related to the occurrences of null detection points, while the phase-locked loop components included in the software defined radio transceiver are successfully exploited to guarantee the phase correlation between I/Q signal components. The proposed approach leads to a compact, low-cost, and flexible radar solution, whose application abilities may be simply changed via software, with no need for hardware modifications. Experimental results on a human target are discussed so as to demonstrate the feasibility of the proposed approach for vital signs detection.
近年来，出现了非接触式无线传感方法，以在医疗保健和生物医学领域的框架内实现新的增强发展。这些技术先进的解决方案之一是软件定义雷达平台，这是一种低成本的雷达实现方式，其中所有操作都通过软件实现并可以轻松更改。本文提出了一种具有多普勒细化功能的软件定义雷达实现，用于非接触式监测人体呼吸信号。采用正交接收器 I/Q（同相/正交）架构，以克服与零检测点出现相关的关键问题，同时成功利用软件定义无线电收发器中包含的锁相环组件来保证 I/Q 信号分量之间的相位相关性。所提出的方法导致了一种紧凑、低成本且灵活的雷达解决方案，其应用能力可以通过软件简单更改，而无需硬件修改。讨论了针对人体目标的实验结果，以证明该方法用于生命体征检测的可行性。
