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Current researches show that the clutter rank is much lower than the system degrees of freedom (DoFs) in the airborne MIMO radar with orthogonal waveforms. According to this conclusion, we propose the ground clutter canceller based on the clutter recovery (CCCR) to suppress the clutter and reduce the DoFs of the clutter. Several linearly independent space-time steering-vectors are constructed to recover the original clutter received by the MIMO radar. Then clutter echoes received in adjacent pulses are maximally cancelled to build our clutter canceller. The clutter canceller can be cascaded with the conventional spatial-temporal matching or dimension-reduced STAP to form the two-stage pre-filter and detector. As the pre-filter, the CCCR can evidently reduce the clutter DoFs, leaving more system DoFs available for detecting moving targets. Therefore, the moving target detection performance of the following spatial-temporal matching or dimension-reduced STAP will definitely outperform the original one. Keywords-multiple-input multiple-output (MIMO) radar; space-time adaptive processing (STAP); clutter suppression

The Ground Clutter Canceller based on the Clutter Recovery in Airborne MIMO Radar