Coupled micro-Doppler signatures of closely located targets

Vitali Kozlov*, Sergey Kosulnikov, Dmitry Filonov, Andrey Schmidt, Pavel Ginzburg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The classical Doppler shift originates from the movement of a target's center of mass, but it does not hold information about the internal dynamics of the scattering object. In contrast, micro-Doppler signatures contain data about the micromotions that arise from internal degrees of freedom within the target (such as rotation and vibration), which can be remotely detected by careful analysis of the scattered field. Here we investigate, both theoretically and experimentally, how coupling between a pair of closely situated targets affects the resulting micro-Doppler signatures. The presented model considers a pair of near-field coupled resonators with dynamically reconfigurable scattering properties. Voltage controlled varactor diodes enable modulating the scattering cross section of each target independently, mimicking rotational degrees of freedom. As a result, coupled micro-Doppler combs are observed, containing frequency components that arise from the near field interactions, making it possible to extract information about the internal geometry of the system from far-field measurements. From a practical point of view, micro-Doppler spectroscopy allows remote classification of distant objects, while deep understanding of the coupling effects on such signatures in the low frequency regime can provide valuable insight for radar and sonar systems, as well as optical and stellar radio-interferometry, among many others.

Original languageEnglish
Article number214308
JournalPhysical Review B
Issue number21
StatePublished - 16 Dec 2019


FundersFunder number
Horizon 2020 Framework Programme802279
PAZY Foundation


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