scholarly journals Expectations of maser studies with FAST

2012 ◽  
Vol 8 (S287) ◽  
pp. 350-353 ◽  
Author(s):  
Jiang Shui Zhang ◽  
Di Li ◽  
Jun Zhi Wang
Keyword(s):  
Radio Telescope ◽  
The World

AbstractThe Five-hundred-meter Aperture Spherical radio Telescope (FAST) is being built by the Chinese and will be the largest single dish radio telescope in the world. FAST, with much increase in sensitivity, will give astronomers good opportunities to answer many fundamental questions in astronomy. Here we give a brief introduction of FAST and its enormous potential for studying Galactic and extragalactic masers.

scholarly journals China’s participation in the SKA—the world’s largest synthesis radio telescope

2012 ◽  
Vol 42 (12) ◽  
pp. 1292-1307 ◽  
Author(s):  
ZhenGuo FENG ◽  
YuanPeng ZHENG ◽  
JingChao GENG ◽  
Biao DU ◽  
XiaoMing CHAI ◽  
...  
Keyword(s):  
Radio Telescope ◽  
The World

Dimension Optimization Design of the Stewart Platform in FAST

2011 ◽  
Vol 308-310 ◽  
pp. 2110-2113 ◽  
Author(s):  
Rui Yao ◽  
Wen Bai Zhu ◽  
Qing Ge Yang
Keyword(s):  
Radio Telescope ◽  
Optimization Design ◽  
Design Method ◽  
Stewart Platform ◽  
Design Flow ◽  
Guizhou Province ◽  
Objective Functions ◽  
The World ◽  
Adjustable Mechanism ◽  
Feed Support System

China is now building the largest single dish radio telescope in the world in Guizhou province, which is called Five-hundred meter Aperture Spherical radio Telescope (FAST). A Stewart platform is introduced in FAST as an accuracy adjustable mechanism for feed receivers. The main purpose of this paper is to discuss dimension optimization design method of the Stewart platform based on three optimization objective functions. The optimization objective functions can reflect the operability and accuracy of the Stewart platform, and optimization design flow is presented according to the important degree of the three optimization objectives. Finally, a set of optimized parameters is obtained, and the study in this paper provides a basis for the coming optimization the feed support system for FAST in the next step.

scholarly journals Pulsar Searches at Effelsberg — Past, Present & Future

2000 ◽  
Vol 177 ◽  
pp. 11-16
Author(s):  
D.R. Lorimer ◽  
M. Kramer
Keyword(s):  
Radio Telescope ◽  
Galactic Plane ◽  
Progress Report ◽  
Galactic Centre ◽  
Bright Future ◽  
The World ◽  
Highly Dispersed ◽  
Pulsar Searches

AbstractIt is fair to say that pulsar searches with the 100-m Effelsberg telescope have had something of a checkered history — after all, for many years, this was the largest radio telescope in the world never to have found a pulsar! This situation has, happily, changed. In this review we summarize recent discoveries of weak pulsars along the Galactic plane, give a progress report on a survey for highly dispersed pulsars in the Galactic centre and, in the spirit of this meeting, speculate on what should be a bright future for pulsar searches with this instrument.

scholarly journals Design of an L-Band Cross-Dipole Phased Array Feed for FAST

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Yubing Han ◽  
Luoqing Zhong
Keyword(s):  
Radio Telescope ◽  
High Performance ◽  
Phased Array ◽  
Low Cost ◽  
Dipole Antenna ◽  
Field Of View ◽  
System Model ◽  
Beam Formation ◽  
The World ◽  
L Band

The Five-Hundred-Meter Aperture Spherical Telescope (FAST) is a Chinese megascience project that aims to build the largest single dish radio telescope in the world. Given its multiple simultaneous beam formation, phased array feed (PAF) is widely used to extend the field of view and enhance the survey speed of the radio telescope. In this study, a broadband and low cost PAF element using cross-dipole antenna at L-band is designed based on the requirement of the FAST. The antenna is fed by two microstrip baluns which have high performance and is easy to manufacture compared to the traditional coaxial balun. A simple system model is also introduced to evaluate the PAF performance. The measured results of the fabricated element and the simulations of the system performance validate the effectiveness of element design.

scholarly journals Preliminary observations at 10-cm wavelength using the NRL 84-foot radio telescope

1959 ◽  
Vol 9 ◽  
pp. 61-68 ◽  
Author(s):  
E. F. McClain ◽  
R. M. Sloanaker
Keyword(s):  
Radio Telescope ◽  
The United States ◽  
Naval Research ◽  
Celestial Object ◽  
Parabolic Antenna ◽  
New Instrument ◽  
The World ◽  
Charles County ◽  
The U.S ◽  
Design Construction

The largest steerable radio telescope in the United States (Fig. 1) has recently been completed at the U.S. Naval Research Laboratory's Maryland Point Observatory in Charles County, Maryland. The new instrument, an 84-foot parabolic antenna, or “dish,” was designed by the D. S. Kennedy Co. of Cohasset, Massachusetts. Originally ordered in June 1955, the instrument has been three years in design, construction, and erection. Carried on a polar or equatorial mount, the 84-foot aluminum reflector can be aimed at any point in the sky and can track any celestial object from horizon to horizon. It is the largest antenna with this type of mounting in the world.

scholarly journals The Five-hundred-meter Aperture Spherical radio Telescope project and its early science opportunities

2012 ◽  
Vol 8 (S291) ◽  
pp. 325-330 ◽  
Author(s):  
Di Li ◽  
Rendong Nan ◽  
Zhichen Pan
Keyword(s):  
Radio Telescope ◽  
National Development ◽  
Low Frequency ◽  
Science Project ◽  
Design Specifications ◽  
The World ◽  
Square Kilometer Array

AbstractThe National Astronomical Observatories, Chinese Academy of Science (NAOC), has started building the largest antenna in the world. Known as FAST, the Five-hundred-meter Aperture Spherical radio Telescope is a Chinese mega-science project funded by the National Development and Reform Commission (NDRC). FAST also represents part of Chinese contribution to the international efforts to build the square kilometer array (SKA). Upon its finishing around September of 2016, FAST will be the most sensitive single-dish radio telescope in the low frequency radio bands between 70 MHz and 3 GHz. The design specifications of FAST, its expected capabilities, and its main scientific aspirations were described in an overview paper by Nan et al. (2011). In this paper, we briefly review the design and the key science goals of FAST, speculate the likely limitations at the initial stages of FAST operation, and discuss the opportunities for astronomical discoveries in the so-called early science phase.

scholarly journals Adapting Active Reflector Technology for greater sensitivity and sky-coverage in FAST-like Telescopes

2020 ◽  
Author(s):  
Jian-Ling Li ◽  
Bo Peng ◽  
Cheng-Jin Jin ◽  
Hui Li ◽  
Richard G Strom ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Zenith Angle ◽  
Spherical Surface ◽  
Innovative Technology ◽  
Spherical Surfaces ◽  
The World ◽  
Active Reflector

Abstract The Five-hundred-meter Aperture Spherical radio Telescope (FAST), the largest single dish radio telescope in the world, has implemented an innovative technology for its huge reflector, which changes the shape of the primary reflector from spherical to that of a paraboloid of 300 m aperture. Here we explore how the current FAST sensitivity can potentially be further improved by increasing the illuminated area (i.e., the aperture of the paraboloid embedded in the spherical surface). Alternatively, the maximum zenith angle can be increased to give greater sky coverage by decreasing the illuminated aperture.Different parabolic apertures within the FAST capability are analyzed in terms of how far the spherical surface would have to move to approximate a paraboloid. The sensitivity of FAST can be improved by approximately 10% if the aperture of the paraboloid is increased from 300 m to 315 m. The parabolic aperture lies within the main spherical surface and does not extend beyond its edge. The maximum zenith angle can be increased to approximately 35 degrees from 26.4 degrees, if we decrease the aperture of the paraboloid to 220 m. This would still give a sensitivity similar to the Arecibo 305 m radio telescope. Radial deviations between paraboloids of different apertures and the spherical surfaces of differing radii are also investigated. Maximum zenith angles corresponding to different apertures of the paraboloid are further derived. A spherical surface with a different radius can provide a reference baseline for shape-changing applied through active reflector technology to FAST-like telescopes.

scholarly journals Finding Pulsars at Parkes

2001 ◽  
Vol 18 (1) ◽  
pp. 1-11 ◽  
Author(s):  
R. N. Manchester
Keyword(s):  
Radio Telescope ◽  
Globular Clusters ◽  
Millisecond Pulsars ◽  
Statistical Estimates ◽  
Detection Algorithms ◽  
The World ◽  
Detection Instrument ◽  
Pulsar Searches ◽  
Galactic Distribution ◽  
Unique Individual

AbstractThere are many reasons why it is important to increase the number of known pulsars. Not only do pulsar searches continue to improve statistical estimates of, for example, pulsar birthrates, lifetimes and the Galactic distribution, but they continue to turn up interesting and, in some cases, unique individual pulsars. In the early days of pulsar astronomy, the Molonglo radio telescope led the world as a pulsar detection instrument. However, the Parkes radio telescope, with its frequency versatility and greater tracking ablility, combined with sensitive receivers and powerful computer detection algorithms, is now the world’s most successful telescope at finding pulsars. The Parkes multibeam survey, begun in 1997, by itself will come close to doubling the number of known pulsars. Parkes has also been very successful at finding millisecond pulsars (MSPs), especially in globular clusters. One third of the known MSPs have been found in just one cluster, 47 Tucanae.

scholarly journals The Universe at Very Low Radio Frequencies

2002 ◽  
Vol 199 ◽  
pp. 490-491 ◽  
Author(s):  
S. Ya. Braude ◽  
A.A. Konovalenko ◽  
A.V. Megn
Keyword(s):  
Radio Telescope ◽  
Decameter Wavelength ◽  
The World ◽  
Radio Frequencies ◽  
The Universe

The world biggest decameter wavelength radio telescope UTR-2 and VLBI system URAN, as well as main observational programs carried out with the above mentioned instruments, are described.

scholarly journals Biggest radio telescope in the world

Nature ◽  
1980 ◽  
Vol 287 (5783) ◽  
pp. 575-575
Keyword(s):  
Radio Telescope ◽  
The World
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