An improved scheme for the frequency domain ΣΔ-DPCA

In this paper, the frequency domain ΣΔ-DPCA processing (F - ΣΔ - DPCA) is investigated in detail, and an improved scheme for the F - ΣΔ - DPCA is proposed, which can significantly reduce the computational burden. In practice, due to the sum and difference beam pattern designed independently and other system errors, the clutter suppression of the time domain ΣΔ - DPCA processing (T - ΣΔ - DPCA) is significantly degraded. However, the F - ΣΔ - 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-ΣΔ-DPCA can achieve superior performance of clutter cancellation than the time domain processing, and the improve approach is feasible for real-time application.