FFT implementation of Doppler dependent pre-Doppler STAP

The Doppler dependent pre-Doppler STAP method can obtain better performance than the Doppler independent pre-Doppler STAP method at the cost of increased computational complexity. A computationally efficient way of carrying out the Doppler dependent pre-Doppler STAP method is developed without performance degradation. It evaluates all Doppler filter outputs by two groups of FFT, which avoids the need to evaluate the adaptive weight vector and to carry out Doppler processing independently for each adaptive space-time filter.

► We develop a computationally efficient Doppler-dependent pre-Doppler STAP method.
► The method is realized by two groups of FFT.
► The method is consistent with the conventional pre-Doppler STAP method.
► The method can be applied to the PAMF detector.