中心博士生万钧的工作——Super-resolution method for microwave front-looking imaging using broadband signals and spatial spectrum shifting（基于宽带信号和空间频谱搬移的微波前视成像超分辨率方法）的相关成果近期被IEEE Transactions on Microwave Theory and Techniques期刊接收发表，国家自然科学基金（T2225023，62205202）的部分资助。微波由于其波长过长，存在成像孔径大、分辨率低的劣势。主流的SAR、ISAR成像，由于与人类视觉规律不符，易产生视觉畸变。本文提出一种基于空间频谱搬移和宽带信号的新型超分辨前视成像算法。不同于主流的距离-方位成像，本文的视觉成像投影面于照相机一致，可避免主流方法带来的成像畸变。本文的方法结合宽带信号可扩展空间频谱范围且可避免带宽带来的成像畸变。成像结果显示分辨率可以达到6倍以上衍射极限的超分辨成像效果，且没有成像畸变。我们认为本工作是微波成像突破衍射极限、未来达到与光学相机同等分辨效果的坚实一步。
摘要: We propose a super-resolution method for microwave front-looking imaging, which takes advantage of the signal bandwidth to enhance the resolution of imaging. Via spatial spectrum shifting, the distortion introduced by broadband imaging is eliminated. Therefore, the resolution of our method can surpass the Rayleigh diffraction limit defined by the angular aperture. A numerical study shows that, in the case of an angular aperture of 0.22, our method can reach 6 millimeters for a target located 10 km away without imaging distortion. It is equivalent to the resolution of an angular aperture of 1.38 We derive the relationship between the resolution and signal bandwidth, which illustrates that our method makes it possible to use the bandwidth dimension for improving front-looking imaging resolution. The proposed method will promote the development of ultra-long-distance precision imaging and wide-range microwave surveillance.