海面運動艦船目標的高分辨率SAR成像
High Resolution SAR Imaging of Moving Ship Targets at Sea
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摘要: 基于高分辨率機載SAR，研究了合成孔徑成像時間較長情況下海面運動艦船目標的SAR成像問題。根據(jù)船體上不同距離單元散射點多普勒歷程可能不同的特點，采用粗校正和精校正相結合的方法在距離頻率-方位時間域進行二階和高階相位補償，完成運動艦船目標的距離徙動校正。提出了STFT和CDA處理相結合的時頻分析成像方法，以獲得較高的圖像分辨率。實際數(shù)據(jù)的處理結果表明了該方法的有效性。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，宋祖勛，彭進業(yè)，俞卞章. 基于KEYSTONE變換和時頻分析的ISAR成像研究. 西北大學學報(自然科學網絡版)，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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