星载多波束阵列天线中单元失效分析  

Analysis of element failure in space-borne multibeam array antenna

作　　者：宋海伟[1] 洪春冲 李文魁[1] 苏抗[1] 田达[1] 

机构地区：[1]中国航天科工集团8511研究所,江苏南京210007

出　　处：《航天电子对抗》2015年第5期9-12,26,共5页Aerospace Electronic Warfare

摘　　要：针对星载多波束阵列天线无法更换失效阵元或射频通道的问题,提出一种基于系统性能指标判定最大允许失效单元数的方法。给出了基于实数编码遗传算法综合的六边形阵列天线赋形多波束方向图,建立了单元失效时多波束增益方向图模型,并以多波束CDMA卫星通信系统为例,推导了单元失效时系统信噪比和容量公式。仿真结果表明,存在幅相误差的情况下,每失效1个单元系统接收信噪比约下降1.5dB;当系统要求单波束用户容量不低于2个时,最大允许失效单元数为1个。Aiming at the problem that failed elements are impossible to be replaced on board for spaceborne multibeam array antenna, a novel method is proposed to determine the maximal number of failed elements based on system performance metrics. Firstly the shaped beam pattern of 19-elements multibeam hexagonal array based on real-code Genetic algorithm is showed. The gain pattern model after element failure is established, and meanwhile the formulas of system SNR and user capacity are deduced, which is performed for multibeam satellite communication system using CDMA. Numerical results confirm that when ampIitude and phase errors are existed, received SNR is decreased as 1.5dB per one element failure; the maximal number of defective elements is allowed to one when the system capacity of one beam cell is required to be greater than 2.

关 键 词：单元失效 多波束 阵列天线 卫星 

分 类 号：TN820[电子电信—信息与通信工程]