相控阵全光移相网络对空间波束电平的影响  

Effect of Optical Phase-shifting Network on Beam Levels of Phased Array Antenna

作　　者：苏君[1] 邱琪[1] 史双瑾[1] 

机构地区：[1]电子科技大学光电信息学院,成都610054

出　　处：《电子与信息学报》2014年第7期1762-1766,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61271030);中央高校科研基本业务费(E022050205)资助课题

摘　　要：全光移相网络以其宽带、高精度的优势极大地提高了光控相控阵天线的性能,但其引入的附加相位噪声,将导致空间波束电平指标劣化。基于全光移相网络噪声理论和相控阵理论,推导了激光器相对强度噪声、光载波传输链路插入损耗、激光器输出平均光功率与主、副瓣电平关系的理论公式。仿真结果表明在全光移相网络的典型应用参数下,上述3个参量的增大均会导致波束主瓣增益降低和副瓣电平升高,其中激光器相对强度噪声影响最为明显,为了优化波束电平指标,激光器相对强度噪声需低于-140 dB/Hz。The performance of optically controlled phased array antenna is greatly improved by the optical phase-shifting network with its advantages of broad bandwidth and high precision, however the additional phase noise of the optical phase-shifting network could lead to the deterioration of the space beam levels. Based on the analysis of the optical phase-shifting networks noise characteristics and phased array antenna theory, the formulas are derived in this paper, with a description of the relationship between the figure of Relative Intensity Noise （RIN） of laser, fiber links insertion loss, laser average power, and the main lobe level as well as the side lobe level. The simulation and theoretical study show that, with the typical parameter in the optical phase-shifting network, the increase of the three parameters is able to lead to reduce the main lobe gain and raise the side lobe level. The impact of RIN on lobe levels is more obvious. To optimize the lobe levels, the relative intensity noise of laser should be less than-140 dB/Hz.

关 键 词：相控阵天线 全光移相网络 波束形成 波瓣电平 

分 类 号：TN29[电子电信—物理电子学] TN821.8