Radiation Pattern Measurements and Predictions of the PLANCK RF Qualification Model
Radiation Pattern Measurements and Predictions of the PLANCK RF Qualification Model
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PLANCK 射频鉴定模型的辐射方向图测量和预测
DOI：
10.1109/eumc.2008.4751564
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
I. Ristorcelli
中科院分区：
文献类型：
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作者：
G. Forma;D. Dubruel;J. Martí;M. Paquay;G. Crone;J. Tauber;M. Sandri;F. Villa;I. Ristorcelli
普朗克是欧洲航天局的科学任务之一，致力于以前所未有的精度观测宇宙微波背景辐射。影响望远镜性能的关键因素之一是望远镜的辐射模式，特别是在太阳、地球和月球等热天体方向上的副瓣性能。卫星将在低温条件下在深空L2拉格朗日点附近运行。这些条件无法在这种尺寸的有效载荷的天线测试范围内实现。因此，对飞行条件下性能的预测高度依赖于数值模拟。将要使用的模型以前从未被核实到这种保密程度。挑战在于使用一个非常大的物体（孔径尺寸为1.5 m的PLANCK RF鉴定模型，即超过1500波长的320 GHz）在高达320 GHz的频率（远远超出所使用CATR的正常范围）下进行测试活动，以证明副瓣电平低至-90 dB。将介绍测量结果的选择和与预测的比较。
PLANCK is one of the scientific missions of the European Space Agency, devoted to observe the cosmic microwave background radiation with unprecedented accuracy. One of the key factors for the performance is the radiation pattern of the telescope, especially the sidelobe performance in the direction of hot celestial bodies like Sun, Earth and Moon. The satellite will operate around the L2 Lagrangian point in deep space under cryogenic conditions. These conditions can not be realized in an antenna test range for a payload of this size. Therefore, the predictions for the performance under flight conditions depend highly on numerical simulations. The model to be used had never before been verified to this level of confidentiality. The challenge was to conduct a test campaign at frequencies up to 320 GHz (far beyond the normal range of the used CATR) with a very large object (the PLANCK RF qualification model with an aperture size of 1.5 m, i.e. more than 1500 wavelength at 320 GHz) to demonstrate sidelobe levels down to -90 dB. A selection of the measurement results and comparison with predictions will be presented.