Robust design of mismatched filters in echo truncation for inter-pulse waveform diversity radar

Abstract

Range sidelobe modulation is a primary issue that forbids application of inter-pulse and intra-coherent processing interval (coherent processing interval) waveform diversity in moving target indication or moving target detection radars. Previous research has adopted mismatched filters (MMFs) to reconstruct identical compressed outputs based on an ideal model. In practice however, echo truncation is inevitable due to transceiver isolation, significantly degrading the effectiveness of MMFs. In this paper, the design of MMFs under an echo-truncated model to achieve a robust design is considered. Specifically, the authors extract the dominant scattering profile from the close-range echo and incorporate it into the MMF design model. To judiciously combine the robust design with the ideal one, a segmented pulse compression scheme is proposed. Numerical results indicate that the proposed robust processing scheme can effectively reduce clutter leakage in both truncated and intact scenarios.