A Cross-Track Velocity Estimation and Relocation Method for Ground Moving Target

This paper introduces a method based on sub-aperture division for estimating the cross-track velocity of moving targets in terahertz circular synthetic aperture radar (CSAR). By carefully choosing the number of sub-apertures, the complete aperture is divided into multiple smaller apertures. In the sub-aperture regime, the small-angle approximation is applied to separate the cross-track velocity from other parameters related to moving targets. This approach allows for precise estimation of the cross-track velocity, facilitating accurate repositioning of the moving target. The effectiveness of the proposed method is confirmed through experimental results, evidencing its practicality.