Inverse synthetic aperture radar imaging of targets with nonsevere maneuverability based on the centroid frequency chirp rate distribution

Li Yanyan; Tao Su; Zheng Jibin; Xuehui He

doi:10.1117/1.JRS.9.095065

12 August 2015 Inverse synthetic aperture radar imaging of targets with nonsevere maneuverability based on the centroid frequency chirp rate distribution

Li Yanyan, Tao Su, Zheng Jibin, Xuehui He

Author Affiliations +

Funded by: National Natural Science Foundation, Natural Science Foundation of China, Science Technology Foundation of Shaanxi Province, Science Technology Foundation, Xi’an Polytechnic University

Journal of Applied Remote Sensing, Vol. 9, Issue 1, 095065 (August 2015). https://doi.org/10.1117/1.JRS.9.095065

Abstract

For inverse synthetic aperture radar (ISAR) imaging of targets with nonsevere maneuverability, the Doppler frequencies of scatterers are actually time-varying and azimuth echoes of a range cell have to be modeled as multicomponent linear frequency modulation (LFM) signals after the range alignment and the phase adjustment. In ISAR imaging with the LFM signal model, the chirp rate deteriorates the target image and an effective parameter estimation algorithm is required. By employing a symmetric instantaneous self-correlation function and the modified scaled Fourier transform, an effective parameter estimation algorithm, known as the centroid frequency chirp rate distribution (CFCRD), is proposed and applied to ISAR imaging. Compared to two representative parameter estimation algorithms, the modified Wigner-Ville distribution and the Lv’s distribution, the proposed CFCRD can acquire a higher antinoise performance without spectrum aliasing and brute-force searching. Through simulations and analyses of the synthetic radar data and the real radar data, we verify the effectiveness of CFCRD and the corresponding ISAR imaging algorithm.

Yanyan, Tao, Jibin, and Xuehui: Inverse synthetic aperture radar imaging of targets with nonsevere maneuverability based on the centroid frequency chirp rate distribution

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Li Yanyan, Tao Su, Zheng Jibin, and Xuehui He "Inverse synthetic aperture radar imaging of targets with nonsevere maneuverability based on the centroid frequency chirp rate distribution," Journal of Applied Remote Sensing 9(1), 095065 (12 August 2015). https://doi.org/10.1117/1.JRS.9.095065

Published: 12 August 2015

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