Range Ambiguity Suppression Approach for Quad-pol SAR Systems Based on Modified Azimuth Phase Coding

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Abstract For conventional quadrature-polarimetric (quad-pol) Synthetic Aperture Radar (SAR) systems, as cross-polarized (cross-pol) channels are influenced by the strong co-polarized (co-pol) range ambiguous returns, the range ambiguity levels of cross-polchannels are markedly reduced, which severely restricts the unambiguous swaths. A novel transmission scheme called a hybrid-polarimetric (hybrid-pol) mode is introduced to enhance the range ambiguity levels of cross-pol channels. This scheme improves the performance of cross-pol channels with regards to range ambiguity but deteriorates that of co-pol channels. Therefore, to further enhance the range ambiguity levels of quad-pol SAR systems, the Modified Azimuth Phase Coding (MAPC) technique based on hybrid-pol SAR systems is proposed in this study. By taking advantage of the MAPC modulation/demodulation, the power of range ambiguities is transferred to the azimuth that is filtered by an optimized Wiener filter in the Doppler domain. The simulation results validate that the MAPC technique can markedly eliminate the range ambiguity of quad-pol SAR systems and extend the unambiguous swaths.

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	Articles by authors
	Zhu Xiaojing
	Li Fei
	Wang Robert
	Wang Wei
	Sun Xiang

Key words： Synthetic Aperture Radar (SAR) Quadrature-polarimetric (quad-pol) Hybrid-polarimetric (hybrid-pol) Range ambiguity Modified Azimuth Phase Coding (MAPC) Wiener filter

Received: 2017-02-14; Published: 2017-06-19

Fund: The National Natural Science Foundation of China (61422113), The National Ten Thousand Talent Program-Young Top Notch Talent Program, The Hundred Talents Program of the Chinese Academy of Sciences, The TWIn-L SAR (TerrainWide-Swath Interferometry L-band SAR) Program

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Zhu Xiaojing,Li Fei,Wang Robert et al. Range Ambiguity Suppression Approach for Quad-pol SAR Systems Based on Modified Azimuth Phase Coding[J]. JOURNAL OF RADARS, 2017, 6(4): 420-431.

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