Millimeter-wave receiver optics for korean VLBI network
Millimeter-wave receiver optics for korean VLBI network
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DOI：
10.1007/s10762-007-9296-7
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发表时间：
2008-01-01
期刊：
影响因子：
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通讯作者：
Wylde, Richard
中科院分区：
文献类型：
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作者：
Han, Seog-Tae;Lee, Jung-Won;Wylde, Richard
在过去的几年里，毫米波VLBI（甚长基线干涉测量）观测得到了深入的开展。然而，对流层引起的相位起伏是毫米波VLBI观测灵敏度下降和成像能力受限的关键问题之一。本文介绍了韩国VLBI网毫米波VLBI观测中对流层相位起伏校正的接收光学系统的设计。这些光学器件将光束从天空的一个位置同时引导到22、43、86和129 GHz波段的接收器。讨论了常用椭球镜的成像设计原则和相位误差引起的功率损失等问题。
Over the past several years the millimeter wave VLBI (Very Long Baseline Interferometry) observations have been intensively performed. However phase fluctuation due to troposphere is one of the key issue in terms of degradation of sensitivity and limits imaging capability in millimeter wave VLBI observations. We describe the details of designed receiver optics for the Korean VLBI Network to calibrate tropospheric phase fluctuation for the millimeter wave VLBI observation. These optics guide beams from one position on sky to 22, 43, 86, and 129 GHz-band receivers simultaneously. Several topics, such as the design principles of imaging and power loss due to phase errors on common ellipsoidal mirrors are discussed.