人体呼吸非接触测量中IR-UWB雷达关键参数的研究

摘要

The equivalent-time sampling interval is one of the most important parameters for the impulse-radio ultra-wideband (IR-UWB) radar that concerns the remote measurement of respiration, which was theoretically and experimentally investigated in this paper for the ifrst time. According to the measurement results, the interval had to be smaller than half of the thorax displacement due to the respiration. Therefore, it should be as small as possible for improving the respiration measurement capability of the IR-UWB radar. The equivalent-time sampling period of IR-UWB radar was also determined by the equivalent-time sampling interval. Reduction of the equivalent-time sampling period had no obvious inlfuence on the improvement of the respiration measurement capability. The study in this paper presents significance for the design of the IR-UWB radar in the application of remote vital sign measurement.%等效采样间隔是脉冲超宽带（IR-UWB）雷达的一个重要参数，本文从理论和实验两方面首次研究了该参数对IR-UWB雷达非接触呼吸测量性能的影响。结果表明，等效采样间隔应小于人体呼吸引起的体表微动位移的一半，这是IR-UWB雷达非接触测量人体呼吸的前提条件。因此，可通过减小等效采样间隔来提高IR-UWB雷达的呼吸测量性能。此外，IR-UWB雷达的等效采样间隔同时决定了等效采样周期（即回波慢时间周期），降低等效采样周期对IR-UWB雷达的呼吸测量性能无显著影响。上述研究结果对非接触生命信号测量中的IR-UWB雷达系统设计具有指导意义。