Research Papers

Range ambiguity suppression for multiple-input, multiple-output synthetic aperture radar system using azimuth phase coding technique

[+] Author Affiliations
Lei Guo

Chinese Academy of Sciences, Institute of Electronics, Space Microwave Remote Sensing System Department, Beijing 100190, China

University of the Chinese Academy of Sciences, Institute of Electronics, Beijing 100039, China

Robert Wang

Chinese Academy of Sciences, Institute of Electronics, Space Microwave Remote Sensing System Department, Beijing 100190, China

Yunkai Deng

Chinese Academy of Sciences, Institute of Electronics, Space Microwave Remote Sensing System Department, Beijing 100190, China

Wei Wang

Chinese Academy of Sciences, Institute of Electronics, Space Microwave Remote Sensing System Department, Beijing 100190, China

University of the Chinese Academy of Sciences, Institute of Electronics, Beijing 100039, China

Xiulian Luo

Chinese Academy of Sciences, Institute of Electronics, Space Microwave Remote Sensing System Department, Beijing 100190, China

University of the Chinese Academy of Sciences, Institute of Electronics, Beijing 100039, China

J. Appl. Remote Sens. 8(1), 083519 (Nov 12, 2014). doi:10.1117/1.JRS.8.083519
History: Received July 14, 2014; Accepted October 23, 2014
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Abstract.  For synthetic aperture radar (SAR), range ambiguity causes a great deterioration in imaging performance. To suppress range ambiguity, the azimuth phase coding (APC) technique stands out for its effectiveness with a low implementation complexity among the available approaches. With proper phase modulation and demodulation, the position of an ambiguous signal is shifted in Doppler spectrum and then part of the ambiguity can be filtered out by an azimuth filter. However, since the suppression performance heavily depends on the system oversampling rate, the APC technique cannot achieve the same suppression performance for a multichannel SAR system compared with a single-channel SAR system. A method to suppress the range ambiguity for multiple-input, multiple-output (MIMO) SAR system based on APC technique is presented. By taking advantage of more phase centers of the MIMO SAR, a proper azimuth beamformer weight vector can be computed to null out the ambiguity position in the azimuth frequency domain and reconstruct the useful signal; thus most of the ambiguity components can be significantly suppressed. Finally, the simulation results validate the effectiveness of the proposed method.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Lei Guo ; Robert Wang ; Yunkai Deng ; Wei Wang and Xiulian Luo
"Range ambiguity suppression for multiple-input, multiple-output synthetic aperture radar system using azimuth phase coding technique", J. Appl. Remote Sens. 8(1), 083519 (Nov 12, 2014). ; http://dx.doi.org/10.1117/1.JRS.8.083519


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