Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Moving Target Indication via Three-Antenna SAR with Simplified Fractional Fourier Transform | Wang EURASIP Journal on Advances in Signal Processing 2011 2011 117 http content 2011 1 117 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Moving Target Indication via Three-Antenna SAR with Simplified Fractional Fourier Transform Wen-Qin Wang Abstract Ground moving target indiction GMTI is of great important for surveillance and reconnaissance but it is not an easy job. One technique is the along-track interferometry ATI synthetic aperture radar SAR which was initially proposed for estimating the radial velocity of ground moving targets. However the measured differential phase may be contaminated by overlapping stationary clutter leading to errors in velocity and position estimates. As effective clutter suppression can be achieved by multiple aperture or phase center antennas this article presents a simplified fractional Fourier transform SFrFT for three-antenna-based SAR GMTI applications. This approach cancels clutter with three-antenna-based methods and forms two-channel signals through which moving targets are detected and imaged. Next the Doppler parameters of the moving targets are estimated with the SFrFT-based estimation algorithm. In this way both target location and target velocity are acquired. Next the moving targets are focused with one uniform imaging algorithm. The feasibility is validated by theory analysis and simulation results. Keywords Fractional Fourier transform FrFT Simplified FrFT Along-track interfer-ometry ATI Displaced phase center antenna DPCA Ground moving targets detection GMTD Synthetic aperture radar SAR Three-antenna SAR 1 Introduction Ground moving target indication GMTI is of great interest for surveillance and reconnaissance 1-4 but it is not an easy job because separating the moving targets returns from stationary clutter is a technical challenge 5 . Moving target indication is twofold 6 one is the detection of moving targets within severe ground clutter .
