大口径反射面天线的近场射电全息术
Near-Field Radio Holography of Large Reflector Antennas
摘要：
我们总结了全息法测量天线或射电望远镜反射面轮廓的数学基础。特别是，我们对待的情况下，信号源位于一个有限的距离从被测天线，有必要列入所谓的菲涅尔场项的辐射积分。我们假设一个"全相位“系统，参考接收机提供参考相位。我们描述了一些详细的硬件和软件实现的系统用于全息测量的12米ALMA原型亚毫米天线。我们包括测量和表面设置的实用性的描述。的顶点RSI和AEC（阿尔卡特-EIE-联盟）原型ALMA天线的结果。
英文摘要：
We summarise the mathematical foundation of the holographic method of measuring the reflector profile of an antenna or radio telescope. In particular, we treat the case, where the signal source is located at a finite distance from the antenna under test, necessitating the inclusion of the so-called Fresnel field terms in the radiation integrals. We assume a ``full phase'' system with reference receiver to provide the reference phase. We describe in some detail the hardware and software implementation of the system used for the holographic measurement of the 12m ALMA prototype submillimeter antennas. We include a description of the practicalities of a measurement and surface setting. The results for both the VertexRSI and AEC (Alcatel-EIE-Consortium) prototype ALMA antennas are presented.
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