High Resolution SAR Imaging of Moving Ship Targets at Sea
Tang Li-bo; Li Dao-jing; Wu Yi-rong; Ding Chi-biao
National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese
Academy of Sciences, Beijing 100080, China; Graduate School of Chinese Academy of Sciences, Beijing 100039, China
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.
2006, Vol. 28 
