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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 1908204, 10 pages
https://doi.org/10.1155/2017/1908204
Research Article

High-Resolution ISAR Imaging with Wideband V-FM Waveforms

1State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System (CEMEE), National University of Defense Technology, Changsha 410073, China
2School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Correspondence should be addressed to Xiaoyi Pan

Received 15 April 2017; Revised 8 June 2017; Accepted 2 July 2017; Published 14 August 2017

Academic Editor: Ana Alejos

Copyright © 2017 Dejun Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

V-FM waveforms, composed of two chirp signals with the opposite slopes, can also achieve high range resolution with wide bandwidth via intrapulse frequency modulation. In this paper, a framework for inverse synthetic aperture radar (ISAR) imaging of moving targets with V-FM waveforms is investigated, where the range compression of the received signals is achieved by the dual-channel dechirping and the azimuth compression is done via the traditional Fourier transform (FT). The two corresponding reconstructed temporary high-resolution range profiles (HRRPs) from the double channels are synthesized for the HRRPs of the target, in which one is flipped from left to right and added to the other. Then the final HRRPs are arranged into a two-dimensional (2D) array and the azimuth compression is done via FT to achieve the ISAR imaging after the motion compensation. Simulated trials, adopting the scattering center modeling of the Yak-42 plane, are used to validate the correctness of the analyses and the finally well-focused images greatly support the effectiveness of V-FM waveforms in ISAR imaging.