In the construction of a space radio telescope, it is essential to use materials with a low noise factor and high mechanical robustness for the antenna surface. We present the results of measurements of the reflection performance of two candidates for antenna surface materials for use in a radio telescope installed in a new millimeter-wave astronomical satellite, ASTRO-G. To estimate the amount of degradation caused by fluctuations in the thermal environment in the projected orbit of the satellite, a thermal cycle test was carried out for two candidates, namely, copper foil carbon fiber reinforced plastic (CFRP) and aluminum-coated CFRP. At certain points during the thermal cycle test, the reflection loss of the surfaces was measured precisely by using a radiometer in the 41-45 GHz band. In both candidates, cracks appeared on the surface after the thermal cycle test, where the number density of the cracks increased as the thermal cycle progressed. The reflection loss also increased in proportion to the number density of the cracks. Nevertheless, the loss of the copper foil surface met the requirements of ASTRO-G at the end of the equivalent life, whereas that of the aluminum-coated surface exceeded the maximal value in the requirement even before the end of the cycle.
阿塔卡马大型毫米/亚毫米阵列（英语：Atacama Large Millimeter/Submillimeter Array，简称ALMA）是一个国际射电望远镜，位于智利北部的阿塔卡马沙漠。ALMA位于海拔5000米的干燥场地上，在仪器波长范围为0.3至10毫米的范围内具有良好的大气传输能力。其中一个是多达64个直径为12米的天线，可以在150米到15公里的范围内以多种模式重新配置。第二个阵列由一组四个12米和十二个7米天线组成，在直径约50米的两个紧密排列的配置中的一个中工作。该仪器将提供关于太阳系、银河系和附近高红移宇宙中原子、分子和电离气体和尘埃的干涉和总功率天文信息。在本文中，我们概述了ALMA的科学驱动因素，技术挑战和计划进展。
The CARMA Paired Antenna Calibration System: Atmospheric Phase Correction for Millimeter Wave Interferometry and its Application to Mapping the Ultraluminous Galaxy Arp 193
Anti-windup PI controller for millimeter-wave adaptive optics: a Nobeyama 45 m radio telescope simulation
Kanazawa University（金泽大学）；Nagoya University（名古屋大学）；Kitami Institute of Technology（北见工业大学）；Japan Women’s University（日本女子大学）；Osaka Metropolitan University（大阪公立大学）
Bilateral collaboration between Mexico and the United Kingdom for the construction of technical equipment (CHARM) for the Large Millimeter Telescope (LMT/GTM)
