Comparison of clutter rejection techniques for measurement of small displacements of body surface using radar
Comparison of clutter rejection techniques for measurement of small displacements of body surface using radar
复制标题
雷达测量体表微小位移的杂波抑制技术比较
DOI：
10.1049/el.2016.1461
复制
发表时间：
2016
影响因子：
1.1
通讯作者：
T. Fukuda and H. Sakai
中科院分区：
文献类型：
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作者：
S. Okumura;T. Sakamoto;T. Sato;M. Yoshioka;K. Inoue;T. Fukuda and H. Sakai
为了使用多普勒雷达测量生命体征，常见的方法涉及使用时变回波相位。为了获得这些测量，杂波抑制是必要的，因为杂波功率通常大于回波功率。为了拒绝静态杂波，已经提出了几种技术，假设相对较大的相位旋转角，因为许多研究假设上躯干的测量，其中位移主要由呼吸引起。然而，已知来自人体其他部位的信号具有较小的位移，其表现出小的相位旋转角，这使得杂波抑制更加困难。比较了三种测量微小位移的杂波抑制技术，并研究了它们的性能。使用数值分析，一种方法被证明是最有效的，即使在噪声数据的小位移。最好的方法成功地估计了中心，误差为−13.4和−24.0 dB，信噪比为10和40 dB，相位旋转角范围为90°和15°。
To measure vital signs using Doppler radar, a common approach involves the use of time‐varying echo phase. To acquire these measurements, clutter rejection is necessary because clutter power is often larger than echo power. To reject static clutter, several techniques have been proposed that assume relatively large phase rotation angles because many studies assume the measurement of the upper torso, where displacement is mainly caused by respiration. However, signals from other parts of the human body are known to have smaller displacements that exhibit small phase rotation angles, which make clutter rejection more difficult. Three clutter rejection techniques for measuring small displacements are compared and their performances are investigated. Using numerical analysis, one method is demonstrated to be the most effective, even for small displacements in noisy data. The best method successfully estimates the centre with an error of −13.4 and −24.0 dB, with a signal‐to‐noise ratio of 10 and 40 dB and the range of phase rotation angles of 90° and 15°.