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Time reversal imaging based on joint space–frequency and frequency–frequency data

Published online by Cambridge University Press:  14 January 2019

Tong Mu
Affiliation:
School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China
Yaoliang Song*
Affiliation:
School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China
*
Author for correspondence: Yaoliang Song, E-mail: ylsong@njust.edu.cn

Abstract

A new time reversal (TR) method for target imaging is proposed in this paper. Through single measurement by the antenna array, the received signals are utilized to form the space–frequency–frequency multistatic data matrix (MDM). Singular value decomposition is applied to the matrix to obtain the left singular vectors which span the signal subspace. The obtained vectors are divided into multiple subvectors by two different schemes and used to provide target signatures in the form of coarse frequency dependence and relative phase shifts that can be exploited to construct the imaging function. The performance of the proposed method is investigated through numerical simulations for both single and multiple targets, and the results are compared with the traditional TR method using the frequency–frequency MDM. It turned out that the proposed method is able to achieve high resolution with limited array aperture and shows satisfactory robustness in noise environment. Furthermore, experimental results are provided to show the availability of the method in practical applications.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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