海面运动舰船目标的高分辨率SAR成像
High Resolution SAR Imaging of Moving Ship Targets at Sea
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摘要: 基于高分辨率机载SAR，研究了合成孔径成像时间较长情况下海面运动舰船目标的SAR成像问题。根据船体上不同距离单元散射点多普勒历程可能不同的特点，采用粗校正和精校正相结合的方法在距离频率-方位时间域进行二阶和高阶相位补偿，完成运动舰船目标的距离徙动校正。提出了STFT和CDA处理相结合的时频分析成像方法，以获得较高的图像分辨率。实际数据的处理结果表明了该方法的有效性。Abstract: The SAR imaging of moving ship targets at sea is investigated based on high resolution airborne SAR with longer synthetic aperture time. Because the scatterers at different range cells may have different Doppler characteristics, the range migration correction for moving ship is completed by coarse and fine correction procedures. The compensations of second and higher order phase terms are implemented in range frequency - azimuth time domain. A new time-frequency analysis imaging method is presented for higher image resolution by means of the combination of Short Time Fourier Transform (STFT) and Complex Dual Apodization (CDA). The imaging results of real SAR data show the effectiveness of this method.
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Hajduch G, Le Caillec J M, Garello R. Airborne high-resolution ISAR imaging of ship targets at sea[J].IEEE Trans on Aerospace and Electronic Systems.2004, 40(1):378-[2]Pastina D, Montanari A, Arile A. Motion estimation and optimum time selection for ship ISAR imaging. 2003 IEEE Radar Conferfnce, 2003: 7.14.[3]Chen V C, Hao Ling. Time-Frequency Transforms for Radar Imaging and Signal Analysis [M]. London: Artech House Inc. 2002.[4]Perry R P, Dipietro R C, Fante R L. SAR imaging of moving targets[J].IEEE Trans. on Aerospace and Electronic Systems.1999, 35(1):188-[5]李道京，宋祖勋，彭进业，俞卞章. 基于KEYSTONE变换和时频分析的ISAR成像研究. 西北大学学报(自然科学网络版)，2003, 10(4): 1.6.[6]Carrara W G.，Goodman R S, Majewski R M. Spotlight Synthetic Aperture Radar: Signal Processing Algorithms[M]. London: Artech House Inc., 1995: 507529. -
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