Real-time DBS imaging algorithm based on chirp z-transform

Abstract

A novel Doppler beam sharpening (DBS) algorithm based on chirp z-transform (CZT) is proposed in this letter to correct range cell migration (RCM) without prior knowledge of Doppler centroid. Iterations of conventional Doppler centroid estimation algorithms are avoided, and the impact of Doppler centroid estimation error is further circumvented. The processing steps combining DBS and CZT are given based on FFT, which are suitable for real-time projects. Simulation results prove the effectiveness of the proposed algorithm.