<FONT face=Verdana><FONT face=Verdana>This paper describes a new non-stationary clutter mitigation method. The approach

called as D^3AMF

is performed in three stages

i.e. sub-aperture space-time spectral estimation using only a single range bin

full-dimension space-time spectral reconstruction with least-square fitting and clearing

target detection with adaptive match filtering. An important feature of the proposed method is its ability to extract requisite implementation information from the data itself and without sacrificing space-time aperture. A preliminary result against an airborne simulation data demonstrates the effectiveness of the proposed method.