Spatially Resolved Fast-Time Vibrometry Using Ultrawideband FMCW Radar Systems

作     者：Piotrowsky, Lukas Pohl, Nils 

作者机构：Ruhr Univ Bochum Inst Integrated Syst D-44801 Bochum Germany 

出 版 物：《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 (IEEE微波理论与技术汇刊)

年 卷 期：2021年第69卷第1期

页      面：1082-1095页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Deutsche Forschungsgemeinschaft (DFG German Research Foundation) [287022738-TRR 196] 

主　　题：Radar Radar measurements Biomedical measurement Vibration measurement Radio frequency Distance measurement Ultra wideband radar Displacement measurement distance measurement estimation error millimeter-wave (mmWave) radar processing algorithms radar measurements radar theory ultrawideband radar vibration measurement vibrometers 

摘      要：Highly accurate vibrometry and ranging are important topics in the industrialized economy. Wherever optical measurement technology fails due to its high prices and vulnerability within harsh environments, millimeter-wave (mmWave) radar technology is well suited. This article introduces a signal processing chain for ultrawideband frequency-modulated continuous-wave (FMCW) radar. It uses fast-time measurement to evaluate the instantaneous phase, thus allowing for spatially resolved sensing of multiple simultaneously vibrating radar targets, faster than the chirp rate. In order to accomplish this, a sophisticated error model and a calibration scheme were derived. We used three FMCW radar systems covering a broad range of the mmWave spectrum to demonstrate the signal processing approach. In contrast to the commonly used slow-time measurement principle, the highest detectable frequency was improved from 55 Hz to at least 16 kHz, which is the upper limit of the audio range. Up to 10 kHz could be measured with an underlying large-scale motion of 0.4 m/s, while the vibration displacement was at a minimum of 30 nm.