It is known that the main limitations of space time adaptive processing (STAP) are due to its huge computation burden and the performance degradation because of slow convergence The developments of subband signal processing enable us to solve the STAP problem with fast convergence. This paper compares the mean square error between STAP and subband STAP (SSTAP) and makes clear the condition for STAP and SSTAP to be equivalent.
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