A Novel Moving Ship Target Refocusing Algorithm by HFSWR Information Assisted SAR-GMTI System

Synthetic Aperture Radar (SAR) has advantages such as all-weather, high-resolution, and large mapping bands, which make up for the shortcomings of other surveillance and reconnaissance methods such as optics and infrared. It has good detection and imaging effects on stationary targets. However, SAR imaging of moving targets often results in positional shift and defocusing. The main reason for these problems is that SAR has poor velocity resolution and cannot obtain effective velocity information of moving ship targets. In this case, the paper intends to use High-Frequency Ground Wave Radar (HFSWR) with high velocity resolution to assist SAR [1]. Using the velocity information extracted from HFSWR to achieve position compensation and refocusing of moving ship targets in SAR.