光控相控阵雷达发展动态和实现中的关键技术

本文讨论了光控相控阵雷达的原理和发展现状,介绍了光控技术在宽带宽角扫描相控阵雷达中的应用和优点,详细阐述了不同光实时延迟线(OTTD)的主要构成原理和技术特点,讨论了雷达微波信号的光调制技术和探测技术现状,指出了光控相控阵雷达技术可能的应用方向.文中重点讨论了光控相控阵雷达实现中需解决的关键技术,包括总体设计方案中的系统指标分配,雷达阵面结构设计时光器件温度特性的考虑,微波信号光纤传输中的幅相一致性、动态范围、非线性相位等,OTTD设计加工中的波束切换时间、插入损耗、隔离度、延时精度等.针对OTTD加工中难免存在的加工误差,文中提出了子阵OTTD与阵元移相器联合波控的方法.

Development and Implementation Techniques of Optically Controlled Phased Array Radar

The principle and the technical development of optically controlled phased array radar are discussed.The applications and the advantages of the optical electronic techniques in wideband and wide scanning angle phased array radar are introduced.The structure principles and the features for different types of OTTD's(Optical True Time Delay) are presented in detail.Also,the optical modulation and detection techniques involved in radar microwave signal transimission are discussed,and the possible applications of optically controlled phased array radar techniques are pointed out.Finally,some implementation techniques for optically controlled phased array radar,such as the rational sub-system parameter assignment,the consideration for optical device temperature performance in array architecture designing are discussed.The efficient optical transmission link must be designed carefully so as to get identical amplitude and phase responses,high signal dynamic range,low nonlinear phase distortion.In the OTTD fabrication,the beam switching time,insert loss,crosstalk,time delay error must be considered seriously.To solve the problem of OTTD fabrication error in system level,the idea of joint beam steering controlling in sub-array and antenna element are proposed.