RD-Domain Aperture Generation via Dual-Domain Information Reconstruction for Shipborne HFSWR

To extend the detection range of shore-based high-frequency surface wave radar (HFSWR), mobile shipborne systems have been introduced; however, the constrained deck length limits the array aperture and degrades spatial-beam gain. Conventional aperture-extension techniques fail in HFSWR scenes dominated by non-target components, and single-domain processing leaves further gains unrealized. To address the above issues, a range-Doppler domain (RD-domain) virtual aperture generation (AG) method via dual-domain information reconstruction (DDIR) has been proposed. Specifically, to overcome the limitations of underutilized echo information, the proposed DDIR method establishes a unified RD-domain framework. It jointly exploits signal-domain and time-domain information to synthesize a larger virtual aperture, thereby directly enhancing angle measurement performance and system robustness, obtaining narrower beams, and offering valuable insights for advancements in remote sensing and maritime communications.