Implementation of ATI-GMTI process on Airborne and Automobile SAR data

This paper presents the methodology to implement Ground Moving Target Indication (GMTI) with Along Track Interferometry (ATI) process on two kinds of data achieved from different platforms, i.e., airborne and automobile. Raw data were acquired by direct experiment on the bistatic Frequency Modulation Continuous Wave-Synthetic Aperture Radar (FMCW-SAR) system, which is useful for constructing small-sized SAR systems. The acquired raw data were processed by Range Doppler Algorithm (RDA) to form Single Look Complex (SLC) images. Following that, SAR images from two channels were precisely co-registered to generate interferogram that includes the target velocity information. Furthermore, residual phase component, flat-earth phase, was removed from the interferogram by executing platform motion compensation. Distinguishing geometrical structure of airborne system and automobile system impact on extracting target velocity are being studied through a series of GMTI experiments and subsequent analysis.