Two-dimensional autofocus technique for stepped-frequency ISAR imaging

2007 ◽  
Author(s):  
H.-R. Jeong ◽  
K.-T. Kim ◽  
H.-T. Kim ◽  
S.-H. Park
Keyword(s):  
Two Dimensional ◽  
Isar Imaging ◽  
Stepped Frequency

scholarly journals An Efficient Signal Reconstruction Algorithm for Stepped Frequency MIMO-SAR in the Spotlight and Sliding Spotlight Modes

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Jiajia Zhang ◽  
Guangcai Sun ◽  
Mengdao Xing ◽  
Zheng Bao ◽  
Fang Zhou
Keyword(s):  
Efficient Algorithm ◽  
Low Cost ◽  
Signal Reconstruction ◽  
Multiple Input Multiple Output ◽  
Reconstruction Algorithm ◽  
Synthetic Aperture ◽  
Two Dimensional ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Stepped Frequency

Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) using stepped frequency (SF) waveforms enables a high two-dimensional (2D) resolution with wider imaging swath at relatively low cost. However, only the stripmap mode has been discussed for SF MIMO-SAR. This paper presents an efficient algorithm to reconstruct the signal of SF MIMO-SAR in the spotlight and sliding spotlight modes, which includes Doppler ambiguity resolving algorithm based on subaperture division and an improved frequency-domain bandwidth synthesis (FBS) method. Both simulated and constructed data are used to validate the effectiveness of the proposed algorithm.

A Fully Automatic Autofocusing Algorithm for Post-processing ISAR Imaging based on Image Entropy Minimization

1970 ◽  
Vol 110 (4) ◽  
pp. 125-130
Author(s):  
E. D. Kallitsis ◽  
A. V. Karakasiliotis ◽  
G. E. Boultadakis ◽  
P. V. Frangos
Keyword(s):  
Computational Cost ◽  
Angular Acceleration ◽  
Synthetic Aperture ◽  
Post Processing ◽  
Acceptable Range ◽  
Image Entropy ◽  
Isar Imaging ◽  
Fully Automatic ◽  
Simulation Results ◽  
Stepped Frequency

Autofocus is a technique for improving inverse synthetic aperture radar (ISAR) imaging. In this paper, a novel autofocusing method is developed for high-resolution stepped-frequency ISAR. Non-uniform rotational motion is compensated through the proposed post-processing methodology. In this way, the computational cost of polar reformatting process can be circumvented. The proposed CPI-split autofocusing process results in well-focused ISAR images for high angular acceleration periods. Finally, ISAR image entropy dependencies are thoroughly examined through various simulation results, leading to an acceptable range of entropy values for the autofocusing process. Ill. 7, bibl. 9, tabl. 3 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.110.4.305

ISAR Imaging Using a New Stepped-Frequency Signal Format

2014 ◽  
Vol 52 (7) ◽  
pp. 4291-4305 ◽  
Author(s):  
Jiemin Hu ◽  
Jun Zhang ◽  
Qinglin Zhai ◽  
Ronghui Zhan ◽  
Dawei Lu
Keyword(s):  
Frequency Signal ◽  
Isar Imaging ◽  
Stepped Frequency

ISAR imaging of space objects based on stepped frequency modulation

2013 ◽  
Author(s):  
Xiaoyan Bian ◽  
Yingjie Zhang ◽  
Yingmin Ma ◽  
Lizhi Zhao ◽  
Xiongkui Zhang
Keyword(s):  
Frequency Modulation ◽  
Isar Imaging ◽  
Space Objects ◽  
Stepped Frequency
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