Gao Bindong, Zhang Fangzheng, Zhao Ermao, Zhang Daocheng, Pan Shilong
Opt Express. 2019 Apr 29;27(9):13194-13203. doi: 10.1364/OE.27.013194.
A photonics-based broadband phased array radar is demonstrated to realize high-resolution imaging based on digital beamforming. This photonics-based phased array radar can achieve a high range resolution enabled by a large operation bandwidth, and can realize squint-free beam steering by digital true time delay (TTD) compensation. In addition, the photonic dechirp processing applied in the receiver can alleviate the hardware requirements for data sampling and storage, and hence remarkably enhance the real-time signal processing capability. In a proof-of-concept experiment, target imaging by a photonics-based 1 × 4 phased array radar that has a bandwidth of 4 GHz (22-26 GHz) is demonstrated, of which the range and azimuth resolution is measured to be 3.85 cm and 2.68°, respectively. The proposed scheme provides good solution to overcoming the bandwidth limitation and implementing high-resolution imaging in a phased array radar.
一种基于光子学的宽带相控阵雷达被证明能够基于数字波束形成实现高分辨率成像。这种基于光子学的相控阵雷达通过大工作带宽实现高距离分辨率，并通过数字真时延（TTD）补偿实现无斜视波束控制。此外，接收机中应用的光子解线调处理可以减轻数据采样和存储的硬件要求，从而显著提高实时信号处理能力。在概念验证实验中，展示了基于光子学的1×4相控阵雷达（带宽为4 GHz，22 - 26 GHz）的目标成像，其距离分辨率和方位分辨率分别测得为3.85 cm和2.68°。所提出的方案为克服带宽限制和在相控阵雷达中实现高分辨率成像提供了良好的解决方案。
