Experimental Analysis of Accuracy and Precision in Displacement Measurement Using Millimeter-Wave FMCW Radar

被引:0
作者
Takamatsu, Hajime [1 ]
Hinohara, Nariteru [1 ]
Suzuki, Ken [2 ]
Sakai, Fuminori [2 ]
机构
[1] Analog Devices KK, 1-9-1 Higashi Shimbashi,Minato Ku, Tokyo 1057323, Japan
[2] Sakura Tech Corp, 3-2-6 Shin Yokohama,Kohoku Ku, Yokohama, Kanagawa 2220033, Japan
来源
APPLIED SCIENCES-BASEL | 2025年 / 15卷 / 06期
关键词
displacement measuring; vibration monitoring; condition-based monitoring; CbM; FMCW radar; millimeter wave; 79; GHz;
D O I
10.3390/app15063316
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Featured Application Contactless vibration or displacement sensing by millimeter-wave radar.Abstract Millimeter-wave radar is emerging as a key sensor technology not only for autonomous driving but also for various industrial applications, such as vital sign monitoring and structural displacement sensing using millimeter-wave FMCW radar, which must detect extremely small displacements on the sub-micron scale. Accurate displacement measurements fundamentally rely on obtaining precise intermediate frequency (IF) phase data over slow time (i.e., chirp-to-chirp intervals or pulse repetition time) generated by the radar sensor system. In this study, we developed a millimeter-wave FMCW radar sensor for displacement sensing using a 77-81 GHz radar transceiver MMIC (Monolithic Microwave Integrated Circuit) and evaluated its accuracy and precision through a series of experiments. First, we assessed the MMIC's phase performance under static conditions using a rigid RF waveguide, and second, we measured a vibrating target using an industrial vibration shaker as a reference. The experiments demonstrated a maximum accuracy error of +0.359 degrees (1.907 mu m displacement) and a maximum 3-sigma precision of +/- 0.358 degrees (+/- 1.180 mu m displacement), validating the feasibility of using millimeter-wave radar to measure very small displacements.
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页数:18
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