基于集成光学的波束形成以及误差分析

Beam-forming based on integrated optics and error analysis

为了在系统设计中规避二维光子探测器(PD)阵列,基于集成光学对从空间光角度实现时延网络以及波束形成原理进行研究,通过集成光学空间棱镜组的方法进行光分束和合束,并利用空间光探测器的低通滤波效果实现射频波束的相干合成等关键技术。采用数值仿真对影响波束合成的误差因素进行分析,并与实测结果进行对比。仿真和实测结果相关误差会恶化波形质量和副瓣水平,但仍能够在±30°空域范围内和3:1的频域带宽内实现设计指向的同时四波束方向图。

In order to avoid 2D Photo Detector（PD） array in system design,a research on the theory of time-delay network and beam-forming according to integrated optics based on the microwave optics is performed, in which lens group is utilized to divide and reform the light,and the low-pass character of the photo-detectors is adopted to realize the coherent reforming of Radio Frequency（RF） signals. Errors and their influence on beam-forming are simulated,and the results are compared with the measurements,which reveal that although the signal qualities and the side-lobe levels are decreased,a pattern of four beams in ±30° within 3：1 bandwidth is realized as designed.