光纤光栅光谱与雷达方向图特性分析

Characteristic Analyses of the Spectra of Fiber Gratings and Antenna Patterns of Radar

光纤光栅在雷达领域发挥着重要作用,与此同时光纤Bragg光栅的反射光谱和雷达方向图间也存在一定的相似性,如光栅的光谱切趾和雷达的方向图加权有类似的作用,都是为了抑制信号的旁瓣或者副瓣。基于耦合模理论对均匀光栅、相移光栅、切趾光栅、啁啾光栅等光纤Bragg光栅的反射光谱进行了仿真分析,同时,根据上述光栅的结构模型,构建了一维阵列雷达模型,并对相应阵列的方向图进行了分析和仿真。仿真结果表明,相关构型能够起到方向图调制的效果,如实现对副瓣抑制的效果等。研究内容促进了光纤光学和雷达领域的相关成果转化和交叉学科发展。

Fiber gratings play important roles in area of radar,meanwhile,the reflection spectra of fiber Bragg gratings and the antenna patterns of radar also have certain similarities,such as,the apodization to the fiber gratings spectrum and the weighting to the antenna pattern have similar effects,both are to suppress the side lobes or minor lobes of the signals.Simulations to the reflection spectra of the fiber Bragg gratings,such as uniform gratings,phase-shifted gratings,apodized gratings and chirped gratings are conducted,based on the coupled mode theory.At the same time,according to the structure models of above gratings,the models of the unidimensional array radar are established,and analyses and simulations to the antenna patterns of the corresponding arrays are conducted.The simulations show that related structures have the effects of modulation to the array pattern,such as suppressing the minor lobes.The research contents could promote the achievement transformation and the interdisciplinary development in areas of fiber optics and radar.