相控阵孔径级同时收发技术研究

A Study on Aperture-level Simultaneous Transmit and Receive Technology

传统同时收发技术主要针对无线通信中的单元级天线配置进行研究,文中以大规模阵列作为研究对象,研究针对孔径级的收发同时技术,实现了大规模相控阵体制下的收发隔离。结合自适应阵列加权和收发隔离技术,以拉格朗日乘子法获得最优加权矢量。通过最小化耦合信号、最大化期望方向增益来构造代价函数,求得在线性约束最小方差准则下的最优权值。结果表明:在不影响目标检测性能的情况下,该方法能提供110 dB以上的隔离度,具有一定的工程参考意义。

Traditional simultaneous transmit and receive(STAR) technology mainly focuses on element-level antenna configurations in wireless communication. This paper takes large antenna array as research object, focusing on aperture-level STAR and achieving high transmit-receive isolation. The method combines adaptive digital beamforming and transmit-receive isolation technology, using Lagrangian multiplier method to obtain the optimal weighted vector. The cost function is constructed by minimizing coupling signal and maximizing gain in direction of interest, and the array weighting is obtained under the linear constraint minimal variance rule. The method will provide at least 110 dB isolation between transmitter and receiver without affecting the performance of target detection, which provides certain reference significance in engineering.