Efficient detection of ground moving targets in FMCW SAR by focusing

Frequency-Modulated Continuous-Wave Synthetic Aperture Radar (FMCW SAR) is a compact promising remote imaging sensor. Providing FMCW SAR system with simultaneous GMTI application is an appealing and difficult work. To discriminate the target optimally, the total moving target range walk must be taken in account, especially considering its high resolution property. In this paper a concept of relative motion is extended to FMCW SAR. A novel moving target signal model is proposed. By searching the relative velocity, the moving target can be focused accurately like a fixed target in squint SAR mode. An optimal detection and parameter estimation scheme is ultimately introduced.