The frequency domain ∑△-DPCA processing (F-∑△-DPCA) is investigated in detail, and an im-proved scheme for the F-]EA-DPCA is proposed, which can significantly reduce the computational burden. In practice, because of the sum and difference beam pattern designed independently and other system errors, the clutter suppression of the time domain ∑△-DPCA processing (T-∑△-DPCA) is significantly degraded. However,the F-∑△-DPCA adaptively calculates the optimum gain ratio for motion compensation within each Doppler cell,which is robust to system errors. Theoretical analysis and simulation results are presented to validate that the F-∑△-DPCA can achieve superior performance of clutter cancellation than the time domain processing, and its performance can be significantly increased if more pulses are used for the Doppler filtering. The improved approach is efficient, and feasible for real-time application.