Abstract
Vibration induces a micro-Doppler effect, which contains crucial motion information and features of the micro-motion target. However, the traditional radar can only acquire micro-motion information in the radial direction. The multi-channel radar is capable of acquiring actual micro-motion information in a three-dimensional space, including amplitude, frequency, and three-dimensional direction of vibration. Moreover, the high-accuracy parameter estimation can be achieved in the terahertz band. In this paper, a method for three-dimensional micro-motion feature exaction and parameter estimation is proposed, including a phase-derived-range algorithm, interference, and auto-correlation. Meanwhile, to prove feasibility of the method, the results of simulations and experiment based on a 0.22 THz multi-channel radar system are presented after theoretical analyses.
Highlights
Vibration, a common type of micro-motion [1], greatly influences radar imaging, thereby resulting in the deteriorated defocusing phenomenon
If the target did not vibrate in the radial direction, the traditional single-channel radar can only acquire the radial component of the echoes
The values of experimental parameters are presented as follows
Summary
A common type of micro-motion [1], greatly influences radar imaging, thereby resulting in the deteriorated defocusing phenomenon. The motion information and micro-motion features of the vibrating target can be obtained via radar echo processing. To achieve high resolution imaging of a vibrating target, the three-dimensional micro-motion feature extraction and parameter estimation are extremely necessary. It is vital to provide complete micro-motion feature via three-dimensional interference of multi-channel radar. Utilized netted radars to extract the three-dimensional micro-motion features of a rotating. Studied an extraction method of three-dimensional micro-motion feature from a sliding-type scattering center in ballistic target by utilizing the multi-view characteristics of netted radar [6]. Interferometric Inverse Synthetic Aperture Radar (InISAR) to the three-dimensional micro-motion feature extraction of ballistic targets [7,8]. A three-dimensional micro-motion parameters estimation method for a vibrating target is proposed via multi-channel terahertz radar.
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