Narrow-Band Interference Suppression for SAR Based on Complex Empirical Mode Decomposition

Narrow-band interference (NBI) is a common interference source in synthetic aperture radar (SAR) imaging. Its existence will degrade the imaging quality greatly. Based on detailed analysis on the characteristics of NBI, this letter proposes a new NBI suppression algorithm using the complex empirical...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2009-07, Vol.6 (3), p.423-427
Main Authors: Feng Zhou, Feng Zhou, Mengdao Xing, Mengdao Xing, Xueru Bai, Xueru Bai, Guangcai Sun, Guangcai Sun, Zheng Bao, Zheng Bao
Format: Article
Language:English
Subjects:
Algorithms
Complex empirical mode decomposition (CEMD)
Decomposition
Echoes
Electromagnetic radiative interference
Empirical analysis
Filtering
Frequency
Imaging
Interference
Interference suppression
Matched filters
narrow-band interference (NBI)
Narrowband
Radar imaging
Radar polarimetry
Radiofrequency interference
Remote sensing
Synthetic aperture radar
synthetic aperture radar (SAR)
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Summary:Narrow-band interference (NBI) is a common interference source in synthetic aperture radar (SAR) imaging. Its existence will degrade the imaging quality greatly. Based on detailed analysis on the characteristics of NBI, this letter proposes a new NBI suppression algorithm using the complex empirical mode decomposition (CEMD) method. In this algorithm, echoes that include NBI are recognized in the time domain first. Then, these echoes are decomposed into a number of intrinsic mode functions (IMFs) via the CEMD. After that, IMFs that correspond to NBI are subtracted from the echoes by thresholding. Finally, well-focused SAR imagery can be obtained from the separated target echoes using traditional SAR imaging algorithms. The effective data loss in this algorithm is smaller than other NBI suppression approaches. In addition, this algorithm is robust to time-varying NBI. Imaging results of measured data have proved the validity of this algorithm.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2009.2015340