This paper investigates the approaches to ground moving target indication (GMTI) for distributed small satellite SAR systems.In particular

we focus on the processing approaches to resolving the range/Doppler aliasing caused by the small antennas of small SAR systems and the high sidelobes arising from the highly sparse satellite array.The key idea of this paper is to extract the space-time spectra of ground moving targets from the space-time plane by using a space-time adaptive processing (STAP) algorithm.Then conventional SAR imaging processing can be used to fully focus the extracted space-time spectra of ground moving targets.To overcome the "blind velocities" caused by the high sidelobes

an approach is suggested to scan the whole space-time plane with the array steering vector is suggested.