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An SAR-ISAR Hybrid Imaging Method for Ship Targets Based on FDE-AJTF Decomposition

1
State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, Luoyang 471003, China
2
School of Graduate, Space Engineering University, Beijing 101416, China
3
Space Engineering University, Beijing 101416, China
*
Author to whom correspondence should be addressed.
Electronics 2018, 7(4), 46; https://doi.org/10.3390/electronics7040046
Received: 1 March 2018 / Revised: 26 March 2018 / Accepted: 29 March 2018 / Published: 30 March 2018
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Abstract

In high-resolution spaceborne synthetic aperture radar (SAR), imaging of moving ship targets is strongly influenced by ships’ complex three-axis motions, so that imaging results are fuzzy and unfocused. Yet scattered and moving information on ship targets is wholly contained in the complex image data. This paper proposes a novel SAR and inverse SAR (SAR–ISAR) hybrid imaging method to improve imaging effects, using this complex SAR image data on ship targets, and based on frequency-domain-extraction-based adaptive joint time frequency (FDE–AJTF) decomposition. First, complex SAR image data is transformed to the Doppler domain in the azimuth dimension, and the optimum azimuth data are selected. Next, the signal in each range cell is decomposed to its polynomial phase signal (PPS) components by FDE–AJTF. Finally, a two-dimensional image of the ship target at a given azimuth time is constructed directly. The feasibility and effectiveness of this proposed imaging method is verified through comparisons with conventional methods in simulation and experimental tests. View Full-Text
Keywords: moving ship imaging; SAR–ISAR hybrid imaging; FDE–AJTF; optimum azimuth selection; image construction moving ship imaging; SAR–ISAR hybrid imaging; FDE–AJTF; optimum azimuth selection; image construction
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Lao, G.; Yin, C.; Ye, W.; Sun, Y.; Li, G.; Han, L. An SAR-ISAR Hybrid Imaging Method for Ship Targets Based on FDE-AJTF Decomposition. Electronics 2018, 7, 46.

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