Focusing Hypersonic Vehicle-Borne SAR Data With Spiral Trajectory Based on 2-D Lagrange Interpolation

Hypersonic vehicle-(HSV) borne synthetic aperture radar (SAR) with spiral trajectory has significant advantages, such as wide angle coverage, flexible observation geometry, and rich spatial information acquisition. However, the high mobility of the platform can cause many problems for SAR imaging. To address these issues, this letter first establishes a suitable vector model for HSV SAR with spiral trajectory. We proposed an innovative method based on 2-D Lagrange interpolation to address cross–coupling and spatial variation caused by rapid altitude and velocity changes. The performance of the method is demonstrated through simulations and real data experiments. The proposed solution has significant advancements in the application of HSV SAR.