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Advanced Communication Technology Satellite (ACTS) multibeam antenna analysis and experiment

机译:先进通信技术卫星(ACTS)多波束天线分析和实验

摘要

One of the most important aspects of a satellite communication system design is the accurate estimation of antenna performance degradation. Pointing error, end coverage gain, peak gain degradation, etc. are the main concerns. The thermal or dynamic distortions of a reflector antenna structural system can affect the far-field antenna power distribution in a least four ways. (1) The antenna gain is reduced; (2) the main lobe of the antenna can be mispointed thus shifting the destination of the delivered power away from the desired locations; (3) the main lobe of the antenna pattern can be broadened, thus spreading the RF power over a larger area than desired; and (4) the antenna pattern sidelobes can increase, thus increasing the chances of interference among adjacent beams of multiple beam antenna system or with antenna beams of other satellites. The in-house developed NASA Lewis Research Center thermal/structural/RF analysis program was designed to accurately simulate the ACTS in-orbit thermal environment and predict the RF antenna performance. The program combines well establish computer programs (TRASYS, SINDA and NASTAN) with a dual reflector-physical optics RF analysis program. The ACTS multibeam antenna configuration is analyzed and several thermal cases are presented and compared with measurements (pre-flight).
机译:卫星通信系统设计的最重要方面之一是对天线性能下降的准确估计。指向误差,终端覆盖增益,峰值增益降低等是主要问题。反射器天线结构系统的热变形或动态变形会以至少四种方式影响远场天线的功率分布。 (1)降低天线增益; (2)天线的主瓣可能指向错误,从而使传递功率的目的地偏离所需位置; (3)天线方向图的主瓣可以加宽,从而将RF功率散布在比期望更大的区域上; (4)天线方向图旁瓣可能增加,从而增加了多波束天线系统的相邻波束之间或与其他卫星的天线波束之间发生干扰的机会。内部开发的NASA刘易斯研究中心的热/结构/ RF分析程序旨在准确模拟ACTS在轨热环境并预测RF天线性能。该程序将完善的计算机程序(TRASYS,SINDA和NASTAN)与双反射器-物理光学RF分析程序结合在一起。分析了ACTS多波束天线的配置,并介绍了几种散热情况,并将其与测量结果进行比较(飞行前)。

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