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Sensors 2017, 17(3), 613; doi:10.3390/s17030613

Phase Error Correction for Approximated Observation-Based Compressed Sensing Radar Imaging

1,2
,
1,2,* , 1,2
,
1,2
and
1,2
1
Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027, China
2
Key Laboratory of Electromagnetic Space Information, Chinese Academy of Sciences, Hefei 230027, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ram M. Narayanan
Received: 18 December 2016 / Revised: 14 March 2017 / Accepted: 15 March 2017 / Published: 17 March 2017
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [1930 KB, uploaded 19 March 2017]   |  

Abstract

Defocus of the reconstructed image of synthetic aperture radar (SAR) occurs in the presence of the phase error. In this work, a phase error correction method is proposed for compressed sensing (CS) radar imaging based on approximated observation. The proposed method has better image focusing ability with much less memory cost, compared to the conventional approaches, due to the inherent low memory requirement of the approximated observation operator. The one-dimensional (1D) phase error correction for approximated observation-based CS-SAR imaging is first carried out and it can be conveniently applied to the cases of random-frequency waveform and linear frequency modulated (LFM) waveform without any a priori knowledge. The approximated observation operators are obtained by calculating the inverse of Omega-K and chirp scaling algorithms for random-frequency and LFM waveforms, respectively. Furthermore, the 1D phase error model is modified by incorporating a priori knowledge and then a weighted 1D phase error model is proposed, which is capable of correcting two-dimensional (2D) phase error in some cases, where the estimation can be simplified to a 1D problem. Simulation and experimental results validate the effectiveness of the proposed method in the presence of 1D phase error or weighted 1D phase error. View Full-Text
Keywords: phase error correction; compressed sensing; approximated observation; radar imaging phase error correction; compressed sensing; approximated observation; radar imaging
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Li, B.; Liu, F.; Zhou, C.; Lv, Y.; Hu, J. Phase Error Correction for Approximated Observation-Based Compressed Sensing Radar Imaging. Sensors 2017, 17, 613.

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