A novel robust space-time adaptive processing (STAP) method is proposed to eliminate clutter in airborne radar with conformal antennas array.This method filters the target information of range cell under test based on the phase characteristic of target.Then the clutter characteristic are described by constructing AR model and the subspace

which is orthogonal to the clutter and jamming space

is obtained to eliminate clutter.Compared with conventional Doppler compensation methods

direct data domain methods and parametric methods

the proposed method is more robust because its performance can’t be influenced by radar working mode and outliers

and it can be applied for arbitrary array.The simulation results demonstrate its effectiveness.