Kagawa M, Yoshida Y, Kubota M, Kurita A, Matsui T
Graduate School of System Design, Tokyo Metropolitan University, Hino, Tokyo, Japan.
J Med Eng Technol. 2012 Oct;36(7):344-50. doi: 10.3109/03091902.2012.697533. Epub 2012 Jul 17.
We have developed a non-contact heart rate monitoring system for elderly people In bed using two radars placed on the bed base. The system is designed to increase accuracy despite body motion noise and change of body position and sleeping posture In bed. In order to achieve this, we combined an automatic gaIn control (AGC) method with a real-time radar-output channel selection method which is based on a spectrum shape analysis (SSA). Field tests were carried out with elderly subjects at a nursing home. The accuracy was maintained because the system successfully avoided the null detection point (NDP) problem, respiratory harmonic interference and intermodulation problems. The heart rate accuracy (r = 0.703) was higher than that of the conventional method. The system was proved to be effective In monitoring vital signs without the need for any physical contact with the subjects.
我们开发了一种用于卧床老年人的非接触式心率监测系统，该系统使用放置在床架上的两个雷达。该系统旨在提高准确性，尽管存在身体运动噪声以及在床上身体位置和睡眠姿势的变化。为了实现这一目标，我们将自动增益控制（AGC）方法与基于频谱形状分析（SSA）的实时雷达输出通道选择方法相结合。在一家养老院对老年受试者进行了现场测试。由于该系统成功避免了零检测点（NDP）问题、呼吸谐波干扰和互调问题，因此保持了准确性。心率准确性（r = 0.703）高于传统方法。事实证明，该系统在监测生命体征时无需与受试者进行任何身体接触，是有效的。
