利用多重反射拓展有效孔径，提升高反环境微波成像分辨率。
Multipath Exploitation in Highly Reflective Environments for Enhanced Microwave Imaging via Inverse Source Reconstruction
- 通过逆源重建分离真实与虚拟图像源，实现多路径信息利用。
- 相干叠加并相位校正后，有效孔径扩大，分辨率显著提升。
- 有效抑制干扰伪影，适合复杂反射场景的成像应用。
在高反射环境中，多重路径效应严重影响微波成像质量，而物理测量孔径限制了分辨率。本文提出基于图像理论的方法，将理想反射面产生的强散射场表示为虚拟图像源。利用单频逆源求解器，重构并分离原始源与图像源，分别对两者应用成像算法。通过相干组合及适当相位校正，实现有效孔径扩展，从而获得更高分辨率。该分离策略显著降低干扰伪影。仿真结果结合理论分析，与射线追踪增强的背投影算法对比，验证了方法的有效性。
原文摘要 · Abstract (English)
Multipath effects significantly influence the quality of microwave imaging in highly reflective environments, while the physical measurement aperture size constrains resolution. It is shown that by exploiting multipath reflections, improved resolution can be achieved while maintaining acceptable artifact levels. Based on image theory, strong scattered fields from an ideal reflection plane can be represented by virtual image sources. Using a single-frequency inverse source solver, the spatially distributed original and image sources are reconstructed and separated, which allows separate application of the imaging algorithm for both of them. The coherent combination of both sets of sources together with appropriate phase correction results in an effective aperture expansion that yields superior resolution. Furthermore, this separation strategy significantly mitigates interference artifacts. Simulation results, supported by theoretical analysis and comparison with a ray-tracing enhanced backprojection algorithm are presented to verify the effectiveness of the proposed approach.
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