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首页> 外文期刊>Publications of the Astronomical Society of the Pacific >Development of the Phase-up Technology of the Radio Telescopes: 6.7GHz Methanol Maser Observations with Phased Hitachi 32m and Takahagi 32m Radio Telescopes
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Development of the Phase-up Technology of the Radio Telescopes: 6.7GHz Methanol Maser Observations with Phased Hitachi 32m and Takahagi 32m Radio Telescopes

机译：开发无线电望远镜的阶梯技术：6.7GHz甲醇狂欢观察与阶段日立32M和Takahagi 32M收音机望远镜

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摘要

For the sake of high-sensitivity 6.7 GHz methanol maser observations, we developed a new technology for coherently combining the two signals from the Hitachi 32 m radio telescope and the Takahagi 32 m radio telescope of the Japanese Very long baseline interferometer Network (JVN), where the two telescopes were separated by about 260 m. After the two telescopes were phased as a twofold larger single telescope, the mean signal-to-noise ratio (S/N) of the 6.7 GHz methanol masers observed by the phased telescopes was improved to 1.254-fold higher than that of the single dish, through a very long baseline interferometry (VLBI) experiment on the 50 km baseline of the Kashima 34 m telescope and the 1000 km baseline of the Yamaguchi 32 m telescope. Furthermore, we compared the S/Ns of the 6.7 GHz maser spectra for two methods. One is a VLBI method and the other is the newly developed digital position switching that is a similar technology to that used in noise-canceling headphones. Finally, we confirmed that the mean S/N of method of the digital position switching (ON-OFF) was 1.597-fold higher than that of the VLBI method.
机译：为了高灵敏度的6.7 GHz甲醇狂欢者观察，我们开发了一种新技术，即将日立32米射频望远镜和日本非常长的基线干涉仪网络（JVN）的Takahagi 32米射频望远镜合并了两种信号。两个望远镜分开约260米的地方。在将两个望远镜相位为双重较大的单个望远镜之后，分阶段望远镜观察到的6.7GHz甲醇粉碎剂的平均信噪比（S / N）提高到比单皿高的1.254倍，通过一个非常长的基线干涉测量（VLBI）实验，在Kashima 34米望远镜的50公里基线上和Yamaguchi 32 M望远镜的1000公里基线。此外，我们将6.7GHz Maser光谱的S / NS进行了两种方法。一个是VLBI方法，另一个是新开发的数字位置切换，这是一种类似的噪声消除耳机的技术。最后，我们确认数字位置切换（开关）的方法的平均S / N比VLBI方法高1.597倍。

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