Suppression of Azimuth Ambiguities of Strong Point-Like Targets for Multichannel SAR Systems

Multichannel synthetic aperture radar (SAR) signal reconstruction methods can effectively suppress azimuth ambiguities and achieve high-resolution wide-swath imaging. However, due to the characteristics of the practical antenna patterns, there exist non-bandlimited Doppler spectra, which will result...

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Bibliographic Details
Published inIEEE geoscience and remote sensing letters Vol. 14; no. 7; pp. 1046 - 1050
Main Authors Guo, Xiaojiang, Gao, Yesheng, Wang, Kaizhi, Liu, Xingzhao
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.07.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Ambiguity
Antennas
Azimuth
Azimuth ambiguities
Components
Doppler effect
Doppler sonar
Feasibility studies
High resolution
high-resolution wide-swath (HRWS)
History
Image reconstruction
Image resolution
Imaging techniques
Methods
Multichannel communication
multichannel synthetic aperture radar (SAR)
Projection
Radar
SAR (radar)
Signal reconstruction
Spectra
strong point-like targets
Synthetic aperture radar
System effectiveness
Theoretical analysis
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Summary:Multichannel synthetic aperture radar (SAR) signal reconstruction methods can effectively suppress azimuth ambiguities and achieve high-resolution wide-swath imaging. However, due to the characteristics of the practical antenna patterns, there exist non-bandlimited Doppler spectra, which will result in residual azimuth ambiguities, especially for strong targets. This letter presents a novel method for the suppression of the azimuth ambiguities of the strong point-like targets. First, we find out the positions of the strong point-like targets from the multichannel reconstructed SAR image. Then, we locate the ambiguous range history of each strong point-like target. Finally, the ambiguous components in the range history are filtered out by an orthogonal projection method. Therefore, the spectra of the strong point-like targets will be converted into the bandlimited spectra, and then, the azimuth ambiguities can be effectively suppressed by the conventional multichannel SAR signal reconstruction methods. Theoretical analysis and experiments demonstrate the feasibility of the proposed methods.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2017.2694967