无人机微波着陆引导设备扫描波束指向精度改进方法

Research on Method of Improving Scanning Beam Pointing Accuracy in UAV Microwave Landing Navigation System

无人机微波着陆引导设备为提高机动性减少了相控阵扫描天线阵元数目,使得扫描波束展宽、主瓣对称性变差,这会使原有馈相方法的扫描波束指向精度及其鲁棒性降低,设备保障能力减弱。针对这一问题,提出一种将相位循环法与改进遗传算法组合使用以提高扫描波束指向精度的方法。在各扫描指向上,每增加一个相位循环常量进行一次改进遗传算法优化,确定最终的各移相器输入值及其量化方式,克服相位循环法与基本遗传算法单独使用时的不足。仿真分析表明,组合方法产生的扫描波束指向精度优于随机馈相法以及基本遗传算法产生的扫描波束指向精度。

Microwave landing navigation system ning antenna to improve its maneuverability, beam＇s symmetry worse. The phenomenon can of original phasing meth method of the combined ods, and consequentl circle-phase method is used for UAV reducing the number of phased array scan- by so doing, this makes scanning beam wide and main-- reduce y weaken with the the scanning beam pointing accuracy and robust the navigation ability. Aimed at the problem, a improved genetic algorithm is proposed to imp ness new rove the scanning beam pointing accuracy. At every scanning pointing, whenever a circle-phase constant is add- ed, the genetic algorithm is improved to optimize, determine the final phase shifters＂ input values and quantization manners, and overcome the shortage of circle-phase method and basic genetic algorithm in u- sing alone. The simulation shows that the beam pointing accuracy produced by the combination method is superior to the beam pointing accuracy produced by random phasing methods and basic genetic algorithm.