NASA 70米堪培拉天线上的17-27 GHz双喇叭接收器

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS Journal of Astronomical Instrumentation Pub Date : 2019-10-16 DOI:10.1142/s2251171719500144
T. Kuiper, M. Franco, S. Smith, G. Baines, L. Greenhill, S. Horiuchi, T. Olin, D. Price, D. Shaff, L. Teitelbaum, S. Weinreb, L. White, I. Zaw
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引用次数: 2

摘要

在澳大利亚堪培拉附近,一个双波束、双偏振、低噪声的接收器被安装在NASA 70m天线的卡塞格伦焦点上。它同时在17至27 GHz的5对1[公式:见文本]频段中工作。在馈电处测量到的接收器温度为22 GHz时的21-22[公式:见文本]K,在干燥的冬季夜间条件下,在21-22[公式:见文本]GHz频段观测到的天顶系统温度低至35[公式:见文本]K。原生偏振是线性的,但在下转换之前可以转换为圆偏振。下变频器有复杂的混频器,然后是正交混合器,它可以被绕过或用于将正交相位信道转换为上下边带,每个1000 MHz宽。对于光谱学,四个ROACH1信号处理器目前每个都提供32个[公式:见文]K通道频谱,跨越四个1000[公式:见文]MHz频段,在22[公式:见文]GHz下为0.4[公式:见文]km/s速度分辨率。使用波束和位置开关,接收器在一小时的集成中实现了5[公式:见文本]mK r.m.s.的噪声水平和31[公式:见文本]kHz的分辨率。NASA 70[公式:见文]m天线在22[公式:见文]GHz时波束宽度为45弧秒,孔径效率为35.5%,灵敏度为0.49[公式:见文]K/Jy。
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The 17–27 GHz Dual Horn Receiver on the NASA 70 m Canberra Antenna
A dual beam, dual polarization, low noise receiver has been installed at a Cassegrain focus of the NASA 70[Formula: see text]m antenna near Canberra, Australia. It operates in five pairs of 1[Formula: see text]GHz bands from 17 to 27[Formula: see text]GHz simultaneously. The receiver temperature measured at the feed is 21–22[Formula: see text]K at 22[Formula: see text]GHz and, during dry winter night-time conditions, zenith system temperatures as low as 35[Formula: see text]K have been observed in the 21–22[Formula: see text]GHz band. The native polarization is linear but can be converted to circular prior to down-conversion. The downconverters have complex mixers, followed by quadrature hybrids which can be bypassed or used to convert the quadrature phase channels into an upper and lower sideband, each 1000[Formula: see text]MHz wide. For spectroscopy, four ROACH1 signal processors each currently providing 32[Formula: see text]K channel spectra across four 1000[Formula: see text]MHz bands, for 0.4[Formula: see text]km/s velocity resolution at 22[Formula: see text]GHz. Using both beam- and position-switching, the receiver achieved a noise level of 5[Formula: see text]mK r.m.s. in an hour of integration and 31[Formula: see text]kHz resolution. The NASA 70[Formula: see text]m antennas have a 45 arcsec beamwidth at 22[Formula: see text]GHz and an aperture efficiency of 35.5% giving a sensitivity of 0.49[Formula: see text]K/Jy.
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来源期刊
Journal of Astronomical Instrumentation
Journal of Astronomical Instrumentation ASTRONOMY & ASTROPHYSICS-
CiteScore
2.30
自引率
7.70%
发文量
19
期刊介绍: The Journal of Astronomical Instrumentation (JAI) publishes papers describing instruments and components being proposed, developed, under construction and in use. JAI also publishes papers that describe facility operations, lessons learned in design, construction, and operation, algorithms and their implementations, and techniques, including calibration, that are fundamental elements of instrumentation. The journal focuses on astronomical instrumentation topics in all wavebands (Radio to Gamma-Ray) and includes the disciplines of Heliophysics, Space Weather, Lunar and Planetary Science, Exoplanet Exploration, and Astroparticle Observation (cosmic rays, cosmic neutrinos, etc.). Concepts, designs, components, algorithms, integrated systems, operations, data archiving techniques and lessons learned applicable but not limited to the following platforms are pertinent to this journal. Example topics are listed below each platform, and it is recognized that many of these topics are relevant to multiple platforms. Relevant platforms include: Ground-based observatories[...] Stratospheric aircraft[...] Balloons and suborbital rockets[...] Space-based observatories and systems[...] Landers and rovers, and other planetary-based instrument concepts[...]
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