Robust Ambiguous Clutter Suppression for the Near-Shore Water Areas With Spaceborne Multichannel SAR Systems

• Published in: IEEE geoscience and remote sensing letters Vol. 12; no. 2; pp. 319 - 323
• Main Authors: Yang, Zhiwei, Shu, Yuxiang, Liao, Guisheng
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.02.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Azimuth; Azimuth ambiguity; Clutter; clutter suppression; Doppler effect; ground moving target indication (GMTI); Robustness; Spaceborne radar; Synthetic aperture radar; synthetic aperture radar (SAR); Vectors; Azimuth ambiguity; clutter suppression; ground moving target indication (GMTI); synthetic aperture radar (SAR)
• ISSN: 1545-598X; 1558-0571
• DOI: 10.1109/LGRS.2014.2337653

In practice, the ambiguous image of the strong ground clutter may dominate in the adjacent water areas in the case of high-azimuth ambiguity level for the spaceborne synthetic aperture radar. In this letter, a robust ambiguous clutter suppression method is proposed for the ground moving target indication. The subspace projection approach is used to suppress the ambiguous clutter, and the notch broadening technique is used to widen the ambiguous clutter notches for the robustness. The width of the notch is determined by the probability density function of the interferogram's phase. The validity and robustness of the proposed method are verified by the simulation results.