Multiplatform GMTI radar with adaptive clutter suppression

A radar system comprising:

• a data input portion including a first channel configured to receive first radar return samples from a first GMTI radar receiver disposed on a first mobile platform and at least one second channel configured to receive second radar return samples from at least one auxiliary GMTI radar receiver disposed on at least one second mobile platform, the first mobile platform and the at least one second mobile platform defining a distributed array, the first radar return samples and the second radar return samples corresponding to radar return signals originating from a radar transmitter;
• a non-adaptive processing portion coupled to the data input portion, the non-adaptive portion being configured to derive Doppler filtered radar return samples that include a plurality of first clutter signals from the first radar return samples, a plurality of second clutter signals from the second radar return samples and a target signal, the plurality of second clutter signals being characterized by at least one phase delay relative to the plurality of first clutter signals;
• and
• an adaptive processing portion coupled to the non-adaptive processing portion, the adaptive processing portion being configured to calculate a weight value as a function of the plurality of first clutter signals and the plurality of second clutter signals but not the phase delay, the weight value being employed in a weight vector w for a space-time adaptive processing (STAP) filter that applies the weight vector w to a signal vector corresponding to the Doppler filtered radar return samples the STAP filter implementing an open loop feedback configured to create beam pattern nulls at angles corresponding to a plurality of first interference signals within each of the Doppler bins without matching a steering vector to the target vector.