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High resolution SAR imaging of moving ships

The SAR imaging of moving ship targets at sea is investigated with long synthetic aperture time based on high resolution airborne SAR. Because the scatterers at different range-resolution cells may have different Doppler characters, the range migration correction of moving ship is completed by coarse and fine correction procedures. The compensations of second and higher order phase terms are implemented in the “range frequency-azimuth time” domain. An improved time-frequency analysis imaging method is presented for high resolution ship imaging 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. Keywords—SAR; Ship target imaging; Moving target imaging; Time-frequency analysis