可重构微波光子多波束形成技术研究

Study of reconfigurable microwave photonics multi-beamforming technology

在微波光子多波束形成系统中,为了实现多路射频信号与多个波束间的重构,提出了基于光真延迟和光交换阵列的可重构多波束形成技术方案,其中包括电光转换、光交换阵列、多波束分光阵列、固定光延迟阵列以及光电转换等部分。理论分析了该方案的工作原理和重构机制,建立了仿真模拟实验系统,并验证了基于4端口Benes网络的4路射频信号与固定4波束间重构的性能,得到了多种重构状态下的波束方向图。结果表明,该方案相比基于可变光真延迟的方案减少了约2个数量级的光开关使用数量,降低了系统的成本和控制复杂度,实现了4路射频信号和4波束之间的重构。该研究结果为多波束形成技术的应用提供了一种新的途径。

A reconfigurable multi-beamforming technology scheme based on optical true time delay and optical switch array was proposed to achieve the reconfiguration between multiple radio frequency(RF)signals and multiple beams in the microwave photonic multi-beamforming system.The scheme includes electro-optical conversion,optical switch array,multibeam splitter array,fixed optical true time delay array,and photoelectric conversion.The working principle and reconfiguration mechanism of the proposed scheme were theoretically analyzed.A simulation system was established to evaluate the performance of reconfiguration between four RF signals and fixed four beams based on the 4-port Benes network and to obtain the beam pattern under various configured states.The results indicate that the proposed scheme reduces the number of optical switches required by about 2 orders of magnitude compared to the scheme based on variable optical true time delay.The cost can be decreased,and complexity of the system can be controlled at the same time.The reconfiguration between four RF signals and four beams is realized,and a new approach for the application of multi-beamforming technology is provided.