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首页> 外文会议>Antennas amp; Propagation Conference, 2009. LAPC 2009 >Resonance spacecraft antenna calibration: Rheometry and numerical simulations
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Resonance spacecraft antenna calibration: Rheometry and numerical simulations

机译：共振航天器天线校准：流变学和数值模拟

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We report on the calibration effort for the monopole antennas onboard the Resonance spacecraft. The calibration is performed for four boom antennas and four cylindrical sensors at the boom tips. These antennas are devised for the measurement of electrical fields and plasma parameters. We apply two methods for the antenna analysis: first, electrolytic tank measurements (rheometry), which is a method to determine the effective length vectors of electrically short antennas; second, numerical computer simulations which enable us to study also the transition to higher frequencies. The accuracy of the applied methods is about 1 degree for directions of effective axes and some percent for effective lengths and antenna capacitances. It is shown that the electrical representations of the antennas, the effective length vector, differ from their mechanical originals, are shortened and tilted by several degrees of angle. The knowledge of the acquired parameters is of great benefit to the Resonance mission. In particular, goniopolarimetry techniques like polarization analysis and direction finding depend crucially on the effective axes. For the first time this kind of analysis is performed for a spaceborne antenna system consisting of boom monopoles and cylindrical tip antennas.
机译：我们报告了共振航天器上单极天线的校准工作。对动臂末端的四个动臂天线和四个圆柱传感器执行校准。这些天线被设计用于电场和等离子体参数的测量。我们采用两种方法进行天线分析：首先是电解槽测量（流变法），这是一种确定电短天线有效长度矢量的方法。其次，数值计算机仿真使我们能够研究向更高频率的过渡。对于有效轴的方向，所应用方法的精度约为1度，对于有效长度和天线电容，精度约为百分之一。可以看出，天线的电气表示，有效长度矢量不同于其机械原件，并被缩短并倾斜了几个角度。所获取参数的知识对于共振任务非常有用。特别地，诸如极化分析和测向的测角极化技术关键取决于有效轴。首次对由吊杆单极子和圆柱形尖端天线组成的星载天线系统进行了这种分析。

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