Study On Multi-channel Synthetic Aperture Radar Moving Targets Detection,Focalization And Relocation

Moving targets detection is a important technology in the area of Synthetic Aperture Radar (SAR). The multi-channel SAR moving targets especially slow ones detection, focalization and relocation are studied in the dissertation. With the analysis of SAR imaging principle and its reflection model for moving target, the effect of moving target on echoes and imaging is discussed. Then two typical methods of multi-channel SAR moving targets detection--Displaced Phase Center Antenna (DPCA) and Along-Track Interferometry (ATI) and the combine of the two methods are thoroughly studied. Lastly, A method of SAR moving targets detection in complex image field combining DPCA with interferometric processing is used to detect moving targets. And a method using minimum entropy criteria that corrects quadratic phase error via multidimensional search is used to focus moving targets, then the velocity estimation and relocation of moving targets is performed by using the interferometric phase of the two residue SAR images. The method needn't strictly satisfy the constraint of DPCA when the DPCA condition is not satisfied. Also, the new method is easy to implement and can obtain all parameters of moving targets. Some typical computer simulation results and analysis are presented to illustrate the method's validity. Finally, some aircraft-borne three-antenna SAR real data show the validity of the method.