基于微波光子技术的实时高分辨雷达成像

Real-Time High-Resolution Radar Imaging Based on Microwave Photonics

为克服传统雷达面临的带宽瓶颈,提升其分辨率,利用微波光子倍频与混频技术对宽带雷达信号进行处理,构建宽带雷达,成功实现了实时高分辨雷达成像。构建的微波光子雷达样机带宽高达12 GHz,实现逆合成孔径雷达成像的二维分辨率优于2 cm×2 cm,成像速率高达100帧/s。在该雷达架构基础上构建了多输入多输出微波光子雷达,在相同的相参累积时间内,能进一步提高雷达成像的方位向分辨率。研究结果表明:微波光子技术是突破传统雷达频率与带宽限制的有效手段,有望在未来实时高分辨雷达探测与成像中发挥重要作用。

Based on photonic microwave frequency multiplication and mixing,a broadband radar is established to solve problems of the conventional radar limited by its bandwidth and resolution,successfully realizing real-time high-resolution radar imaging.The bandwidth of the proposed radar prototype reaches 12 GHz,the imaging resolution is better than 2 cm×2 cm,and the frame rate is up to 100 frame/s.A multi-input multi-output radar system is also established on the basis of the photonics-based imaging radar architecture,which significantly improves the cross-range resolution within the same coherence time.The experiment and simulation results indicate that microwave photonics can effectively break through the bandwidth limit of conventional electronic radars,and it is expected to play an important role in the future real-time high-resolution radar detection and imaging.