Local-DoFs of Airborne Radar Clutter for Reduced-Dimensional STAP with Sparse Antenna Array

Space-time adaptive processing (STAP) technique can mitigate airborne radar clutter and detect moving targets effectively. Based on adaptive radar theory, the Degrees-of-freedom (DoF) of a STAP processor should be larger than that of the received clutter. The local-DoFs of clutter for Reduced-dimensional STAP (RDSTAP) methods with sparse linear array are studied. The proposed formulas show that the local-DoFs of clutter can be estimated as the product of the equivalent clutter bandwidth with the equivalent sampling interval.