Clutter calibration for space-time airborne MTI radars

For slow target detection with airborne array radar, the ground clutter Doppler spreading due to the platform movement is a limiting factor, especially for long wavelength radar. It is shown that two procedures for slow target detection (Doppler-angle imaging or space-time processing, and movement compensation) are equivalent, and that an original real-time procedure for antenna array calibration using clutter returns can be combined with these detection techniques to increase subclutter visibility in the presence of high clutter returns