Thematische Bibliographien / Radio telescopes

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Auswahl der wissenschaftlichen Literatur zum Thema „Radio telescopes“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 29. Juli 2024

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Zeitschriftenartikel zum Thema "Radio telescopes"

Li, Yuqiao. „State-of-art Facilities and Prospect of Radio Telescopes“. Highlights in Science, Engineering and Technology 5 (07.07.2022): 201–7. http://dx.doi.org/10.54097/hset.v5i.743.

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The radio telescopes play a crucial role in astrophysical observations; hence it is necessary to discuss about the significance, structure, and applications of radio telescope and analyse the difference between the state-of-art radio telescopes (FAST and SKA) based on present information. Specifically, the background and present conditions as well as the history of radio telescopes will be introduced initially. Subsequently, the significance of radio telescope will be explained, including structure and application of radio telescopes. Subsequently, the doubts on FAST and SKA and strengths of them will be clarified. Eventually, the problems and limitations about radio telescope and the future prospect will be discussed. Overall, these results shed light on offering suggestions for future development of galaxy and cosmology observations.

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Hong, Yiduo. „Working principle of the radio telescope and the study of the sun“. Theoretical and Natural Science 12, Nr. 1 (17.11.2023): 172–76. http://dx.doi.org/10.54254/2753-8818/12/20230461.

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Radio telescopes can help people observe celestial bodies far away from people, which is conducive for astronomers to observe and draw the trend of celestial transformations. The use of radio telescopes allows scholars to study and understand celestial bodies to a new height. At present, the more famous are the Webb Space Telescope in the United States, the Hubble Space Telescope and China's Tianyan. In the case of the eye of Heaven in Guizhou, China, the surface of the eye is covered by a metal layer one millimeter thick, so it can not withstand excessive pressure, and the maintenance personnel need to attach themselves to a giant helium balloon to reduce their weight, the whole process is so careful to ensure the safety of the precision instrument. So there are still some limitations in the development of radio telescopes. This paper will focus on the working principle of the radio telescope, the development of the radio telescope and techniques for observing the sun with radio telescopes, summarize the achievements of the radio telescope so far and the areas that need to be improved. To better understand radio telescopes.

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Song, Su. „Evolutions and Principles of Space and Radio Telescope“. Highlights in Science, Engineering and Technology 72 (15.12.2023): 47–52. http://dx.doi.org/10.54097/8r8fyx84.

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Contemporarily, various types of telescopes have been proposed as tools for cosmology observation. This study discusses main types of telescopes, i.e., space and radio telescopes people used to observe universe and gives deep description and comparison between them. Radio telescope is the telescope which can receive radio waves from the outer space and can detect waves in different wavelengths besides visible light. It has a long history, as radio telescope is built on Earth and relatively easier for people to make it, but the drawback is that radio telescope may be disturbed by nature conditions easily, even a small change in the strength of wind or the thickness of atmosphere can make a huge difference to the result. While space telescope is different. The first space telescope is Hubble Space Telescope, which is launched in 1990, thus the history of space telescope is relatively short. Compared with radio telescope, space telescope has its own advantage: since it works in space, changing nature conditions in Earth will not affect its precision, and some cancan work without the impact of infrared radiation of the Earth. However, the repair and maintenance cost are problems as it is difficult for people to go to space and fix the broken parts regularly. This paper can help people have a better understanding of these types of telescopes which are used frequently in observation for the universe.

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Wang, Yu, Haiyan Zhang, Jian Wang, Shijie Huang, Hao Hu und Cheng Yang. „A Software for RFI Analysis of Radio Environment around Radio Telescope“. Universe 9, Nr. 6 (08.06.2023): 277. http://dx.doi.org/10.3390/universe9060277.

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Radio astronomy uses radio telescopes to detect very faint emissions from celestial objects. However, human-made radio frequency interference (RFI) is currently a common problem faced by most terrestrial radio telescopes, and it is getting worse with the development of the economy and technology. Therefore, it is essential to monitor and evaluate interference during the planning, construction, and operation stages of the radio telescope and protect the quiet radio environment around the radio astronomical site. In this paper, we present a software for an RFI analysis of the radio environment around the telescope. In this software, information has been collected, including the location of the site; the technical specifications, such as aperture and the frequency range of the radio telescopes; and the terrain around the site. The software and its modules are composed of telescope, geographic, and meteorological databases, and analysis modules of terrestrial and space-based RFI. Combined with the propagation characteristics of radio waves, we can analyze and evaluate RFI on the ground and in space around the radio telescope. The feasibility of the software has been proved by the experimental implementation of the propagation properties and RFI source estimation. With this software, efficient technical support can be expected for protecting the radio environment around the telescope, as well as improving site selection for planned radio astronomical facilities.

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Wu, Shengyin, Shouguan Wang, Yukuan Mao und Yan Su. „Trying to Enlarge the Sky Coverage of the FAST“. International Astronomical Union Colloquium 182 (2001): 249–53. http://dx.doi.org/10.1017/s0252921100001068.

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AbstractThe proposed FAST project is a novel giant spherical radio telescope, with active elements which form a temporary paraboloid to track radio objects in the sky. Efforts have been made to extend the limited sky coverage that is a characteristic disadvantage of Arecibo-style radio telescopes. Three measures under investigation are introduced in this paper. The expected performance of the telescope is described, and a brief comparison is made with some of the largest existing radio telescopes.

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Wang, Jing-Sheng. „Newly Installed Radio and Optical Telescopes in China“. Publications of the Astronomical Society of Australia 9, Nr. 1 (1991): 60–61. http://dx.doi.org/10.1017/s1323358000024899.

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AbstractNew radio and optical telescopes installed in recent years in China are summarised. These include the 2.16-m optical telescope, the solar magnetic field telescope, the Miyun synthesis radio telescope, the 1.26-m infrared telescope (Beijing Astronomical Observatory), the 25-m radio telescope as the first station of China’s VLBI network, the 1.56-m astrometric telescope (Shanghai Observatory), and the 13.7-m millimetre wave radio telescope.

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Iyer, Aditya Arun, Gautham Manuru Prabhu, Tanay Gupta, Shrey Deshmukh und Rushit Rivankar. „Exploring Design Optimisation Techniques of a Radio Telescope Using Fixed Costing Constraints“. Journal of Physics: Conference Series 2571, Nr. 1 (01.10.2023): 012031. http://dx.doi.org/10.1088/1742-6596/2571/1/012031.

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Abstract Cost optimization is a common problem encountered in the design of telescopes. This paper comprehensively discusses various radio telescope designs worldwide, focusing on their design and utilities. It contextualizes the Pulsar data challenge and subsequently discusses and develops a mathematical model for designing radio telescopes. The model assumes a fixed-cost budget. This paper expands current ideas of modeling the system using figure-of-merit equations and optimizing them based on a fixed budget to obtain optimal and affordable radio telescope designs.

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Yan, Yuefei, Song Xue, Xinlan Hu, Peiyuan Lian, Qian Xu, Na Wang, Wulin Zhao, Yang Wu, Baoyan Duan und Congsi Wang. „Progress and Challenges in Electromechanical Coupling of Radio Telescopes“. International Journal of Antennas and Propagation 2022 (22.11.2022): 1–21. http://dx.doi.org/10.1155/2022/4728303.

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Radio astronomy is a discipline of dynamics and wonders. The vast universe has many secrets to unravel. As one of the important facilities in this discipline, radio telescopes play a key role in collecting astronomical data and unraveling mysteries. With the demand of radio astronomy for a higher frequency, wider bandwidth, higher gain, and higher pointing accuracy, the aperture of the radio telescope is gradually increasing, and its electrical performance and structure have become tightly coupled. Therefore, how to ensure the stable and efficient operation of the telescope for the long-term operation has become the urgent demand for large aperture high-performance radio telescopes. Therefore, this paper firstly makes a comparison of the overall condition of large radio telescopes in nearly a decade that are both constructed and operated, including the progress of radio telescopes that are being constructed and the planning for construction. Then, systematically summarized the latest research progress of electromechanical coupling technology from 3 aspects of connotation and application of electromechanical coupling, and performance guarantee under slowly varying load and performance guarantee under rapidly varying load from the perspectives of design, manufacturing, and observation operating. Lastly, the future research direction of electromechanical coupling technology is pointed out according to the development trend of radio astronomy.

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Y. CH BISSA, Stevry, Ibnu Nurul Huda, Muhammad Bayu Saputra, Sofian Rizal, Ridlo W. Wibowo und Farahhati Mumtahana. „Development of artificial Earth satellite simulation software for future radio telescopes in Indonesia“. Romanian Astronomical Journal 33, Nr. 1-2 (12.12.2023): 3–14. http://dx.doi.org/10.59277/roaj.2023.1-2.01.

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"In the near future, four radio telescopes will be installed in Indonesia. Besides the astronomical purposes, these telescopes are expected to support the ground station for tracking the Artificial Earth Satellites (AES). In this study, we focus on the development of AES simulation software, named AESSIMS, that can be used to aid Indonesian radio telescope engineers in tracking the AES. This software is interactive and web-based. It can track the AES position in real time as well as predict the position for the near future. This software provides information about when a satellite signal can be acquired and lost, which can be beneficial for radio telescopes to establish communication with the satellite. We visualize the use of this software by conducting a simulation of satellite tracking by Indonesian future radio telescopes. Three Indonesian satellites named LAPAN-A1/TUBSAT, LAPAN-A2/ORARI, and LAPAN-A3/IPB are considered in the simulation. This study demonstrates that AESSIMS simulation results for Indonesian satellites and radio telescopes are consistent with the results obtained from already existing satellite tracking simulation software."

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Yang, Guang Pu, Liang Dong, Le Sheng He, Fa Xin Shen, Bin Tian und Sheng Yang Li. „A New Platform for Radio Astronomy Science Education“. Advances in Science and Technology 105 (April 2021): 179–83. http://dx.doi.org/10.4028/www.scientific.net/ast.105.179.

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Radio astronomy telescope can get information from invisible universe by receiving electromagnetic waves. Difference from optical telescopes, there exists many difficulties for making the public understanding the radio astronomy phenomenon. In this paper, we will introduce a new platform for radio astronomy science popularization education in order to help public know radio telescope and radio astronomy. The platform consists of a 0.8meter parabolic antenna, a wide bandwidth low noise amplifier (LNA) and a Software Defined Radio (SDR) terminal. Based on SDR terminal which covers the band from 70MHz to 6GHz, we can get some strong emissions such as the Neutral hydrogen, solar radio bursts and so on in this band. People can carry out many radio astronomy experiments focusing on science popularization by this platform. This new science education tool can interest high school students in science and technology, also students can understand how radio telescopes works.

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Dissertationen zum Thema "Radio telescopes"

Witzemann, Amadeus. „Cosmology with next generation radio telescopes“. University of the Western Cape, 2019. http://hdl.handle.net/11394/6936.

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Philosophiae Doctor - PhD
The next generation of radio telescopes will revolutionize cosmology by providing large three-dimensional surveys of the universe. This work presents forecasts using the technique 21cm intensity mapping (IM) combined with results from the cosmic microwave background, or mock data of galaxy surveys. First, we discuss prospects of constraining curvature independently of the dark energy (DE) model, finding that the radio instrument HIRAX will reach percent-level accuracy even when an arbitrary DE equation of state is assumed. This is followed by a study of the potential of the multi-tracer technique to surpass the cosmic variance limit, a crucial method to probe primordial non-Gaussianity and large scale general relativistic e↵ects. Using full sky simulations for the Square Kilometre Array phase 1 (SKA 1 MID) and the Large Synoptic Survey Telescope (LSST), including foregrounds, we demonstrate that the cosmic variance contaminated scenario can be beaten even in the noise free case. Finally, we derive the signal to noise ratio for the cosmic magnification signal from foreground HI intensity maps combined with background galaxy count maps. Instruments like SKA1 MID and HIRAX are highly complementary and well suited for this measurement. Thanks to the powerful design of the planned radio instruments, all results confirm their potential and promise an exciting future for cosmology.

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Leung, Martin. „A wideband feed for a cylindrical radio telescope“. Phd thesis, School of Physics, 2008. http://hdl.handle.net/2123/5005.

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Thesis (Ph. D.)--University of Sydney, 2008.
Includes graphs and tables. Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Physics, Faculty of Science. Bibliography: p. 196-203. Also available in print form.

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Mountfort, Peter Ian. „The observation of extended sources with the Hartebeesthoek radio telescope“. Thesis, Rhodes University, 1990. http://hdl.handle.net/10962/d1005265.

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The Hartebeesthoek Radio Telescope is well suited to mapping large areas of sky at 2.3 GHz because of the stability and sensitivity of the noise-adding radiometer (Nicolson, 1970) and cryogenic amplifier used at this frequency, the relatively large 20' beam of the 26 m dish antenna, and its high-speed drive capability. Telescope control programs were written for the Observatory's online computer for automated mapping. Effort centred on removing the curved baseline or 'background' from each Declination (Dec) scan, due to atmospheric and ground radiation contributions varying as the antenna is scanned. Initially these backgrounds were measured over a wide range of Hour Angle (HA) for the Dec range of a map, and an interpolated curve subtracted from each on-source scan for its HA. A common base level was established by comparison with drift scans (observed with the antenna stationary). These different observations (on- and off-source Dec scans and drift scans) were combined into one in the Skymap system by performing Dec scans at a fixed starting HA for a period long enough to permit 'cold sky' and the source to drift through. A background formed by fitting a smooth curve through the lowest sample at each Dec provides a consistent relative base level for all the scans in an observation. A high scanning speed is used so that observations may fruitfully be repeated three times and interleaved to build a reliable, fully sampled map. As each observation has its own background removed, it may be made at any HA. For comparison, maps of Upper Scorpio produced by the earlier method (Baart et al., 1980) and the Magellanic Cloud region produced by Skymap (Mountfort et al., 1987) are shown. Skymap provides a simple and flexible mapping method which relies on the stability of the noise-adding radiometer and high-speed repeated scans to produce good maps of large or small extent with little computation. Correction for drift is more difficult than with systems which use intersecting scans, such as the 'nodding' scans used by Haslam et al. (1981) or the Azimuth scans of Reich (1982).

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Zwart, Jonathan Tarquin Lawrence. „Preparing for blind surveys with the Arcminute Microkelvin Imager“. Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613300.

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Kaneko, Takeshi. „The Arcminute Microkelvin Imager (AMI)“. Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615182.

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Holler, Christian Matthias. „Correlator and antenna design for the Arcminute Microkelvin Imager (AMI)“. Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619994.

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Hurley-Walker, Natasha. „Targeted science observations with the Arcminute Microkelvin Imager (AMI)“. Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608480.

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Culverhouse, Thomas Louis. „Science targets for the Arcminute Microkelvin Imager“. Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613801.

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Tiplady, Adrian John. „Modeling and measurement of torqued procession in radio pulsars“. Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1005260.

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The long term isolated pulsar monitoring program, which commenced in 1984 using the 26 m radio telescope at the Hartebeeshoek Radio Astronomy Observatory (HartRAO), has produced high resolution timing residual data over long timespans. This has enabled the analysis of observed spin down behaviour for 27 braking pulsars, most of which have dataspans longer than 14 years. The phenomenology of observed timing residuals of certain pulsars can be explained by pseudo periodic effects such as precession. Analytic and numerical models are developed to study the kinematic and dynamic behaviour of isolated but torqued precessing pulsars. The predicted timing residual behaviour of the models is characterised, and confronted with timing data from selected pulsars. Cyclic variations in the observed timing residuals of PSR B1642-03, PSR B1323-58 and PSR B1557-50 are fitted with a torqued precession model. The phenomenology of the observed timing behaviour of these pulsars can be explained by the precession models, but precise model fitting was not possible. This is not surprising given that the complexity of the pulsar systems is not completely described by the model. The extension of the pulsar monitoring program at HartRAO is used as motivation for the design and development of a new low cost, multi-purpose digital pulsar receiver. The instrument is implemented using a hybrid filterbank architecture, consisting of an analogue frontend and digital backend, to perform incoherent dedispersion. The design of a polyphase filtering system, which will consolidate multiple processing units into a single filtering solution, is discussed for future implementation.

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Franke, Timothy Joseph. „Identification and Cancellation of Harmonic Disturbances in Radio Telescopes“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1427897871.

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Bücher zum Thema "Radio telescopes"

R, Butcher Harvey, Society of Photo-optical Instrumentation Engineers., European Southern Observatory und DFM Engineering, Hrsg. Radio telescopes: 27-30 March 2000, Munich, Germany. Bellingham, Wash: SPIE, 2000.

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Netherlands) International SKA Forum 2010 (2010 Assen. SKA beyond astronomy: International SKA Forum 2010, June 9-16, Assen, the Netherlands. Dwingelo: ASTRON], 2010.

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Rossiĭskai︠a︡ konferent︠s︡ii︠a︡ pami︠a︡ti A.A. Pistolʹkorsa "Radioteleskopy RT-2002" (2002 Pushchino, Moscow, Russia). Rossiĭskai︠a︡ konferent︠s︡ii︠a︡ pami︠a︡ti A.A. Pistolʹkorsa "Radioteleskopy RT-2002": Antenny, apparatura, metody : 9-11 okti︠a︡bri︠a︡ 2002 g. : tezisy dokladov. Pushchino: Pushchinskai︠a︡ radioastronomicheskai︠a︡ observatorii︠a︡ AKT︠S︡ FIAN, 2002.

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Armenia) Vseso͡iuzna͡ia konferen͡tsi͡ia "Radioteleskopy i interferometry" (22nd 1990 Yerevan. Tezisy dokladov: XXII Vseso͡iuzna͡ia konferen͡tsi͡ia "Radioteleskopy i interferometry," Erevan, 15-17 ma͡ia 1990 goda. Erevan: RISO NPO "VNIIRI", 1990.

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Ernst, Raimond, und Genee René, Hrsg. The Westerbork Observatory, continuing adventure in radio astronomy. Dordrecht: Kluwer Academic Publishers, 1996.

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Poli͡ak, V. S. Pret͡sizionnye konstrukt͡sii zerkalʹnykh radioteleskopov: Opyt sozdanii͡a, problemy analiza i sinteza. Riga: "Zinatne", 1990.

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B, Smolders A., und Haarlem M. P. van, Hrsg. Perspectives on radio astronomy: technologies for large antenna arrays: Proceedings of the conference held from 12-14 April 1999 at the ASTRON Institute in Dwingeloo, The Netherlands. Dwingeloo, The Netherlands: ASTRON, 1999.

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Workshop, Astronomy and Astrophysics at Sub Millimeter Wavelengths (2000 Rome, Italy). Workshop, Astronomy and Astrophysics at Sub Millimeter Wavelengths: Roma, Sala Marconi del CNR, 20 January 2000. Bologna, Italy: Published for the Società italiana di fisica by Editrice compositori, 2000.

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Maurizio, Candidi, Hrsg. Workshop Astronomy and astrophysics at sub meter wavelengths: [Workshop Astronomia ed astrofisica ...] : Roma, Sala Marconi del CNR, 20 January 2000. Bologna: Italian physical society, 2000.

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Greve, Albert, und Michael Bremer. Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-03867-9.

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Buchteile zum Thema "Radio telescopes"

EkersCSIRO Fellow, Ron, und Thomas L. Wilson. „Radio Telescopes“. In Planets, Stars and Stellar Systems, 315–59. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5621-2_8.

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Kitchin, Chris. „Radio Telescopes“. In Solar Observing Techniques, 185–89. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-0145-1_9.

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Kellermann, K. I. „New Radio Telescopes“. In Highlights of Astronomy, 879–88. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-010-9376-7_130.

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Castelaz, Michael W., J. Donald Cline, Charles Osborne und David A. Moffett. „Small Radio Telescopes“. In Astrophysics and Space Science Library, 271–85. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0253-0_22.

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Baars, Jacob W. M., und Hans J. Kärcher. „Submillimetre-Wavelength Telescopes“. In Radio Telescope Reflectors, 153–83. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65148-4_6.

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Greve, Albert, und Michael Bremer. „Radio Astronomy and Radio Telescopes“. In Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures, 1–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-03867-9_1.

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Schilizzi, Richard T., Ronald D. Ekers, Peter E. Dewdney und Philip Crosby. „Large Radio Telescopes and the Emergence of the SKA, 1957–1993“. In The Square Kilometre Array, 13–46. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-51374-9_2.

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AbstractThe SKA is the culmination of radio telescope design development in the decades prior to 1990. This chapter surveys the earlier telescopes and traces the origins of the ideas behind the SKA design.

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Poggiani, Rosa. „Radio and Submillimeter Astronomy: Radio Telescopes“. In UNITEXT for Physics, 119–28. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44732-2_9.

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Verschuur, Gerrit. „Radio Telescopes: The Future“. In Astronomers' Universe, 187–201. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13422-2_15.

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Cheng, Jingquan. „Fundamentals of Radio Telescopes“. In The Principles of Astronomical Telescope Design, 339–76. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/b105475_6.

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Konferenzberichte zum Thema "Radio telescopes"

Tercero, Felice. „Radio telescopes“. In 2nd MCCT-SKADS Training School. Radio Astronomy: fundamentals and the new instruments. Trieste, Italy: Sissa Medialab, 2009. http://dx.doi.org/10.22323/1.065.0016.

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Serabyn, E., C. R. Masson und T. G. Phillips. „Radio telescope surface measurement with a sharing Fourier transform spectrometer“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.mgg6.

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A broadband technique for measuring the surface accuracy of near millimeter wavelength radio telescopes has been developed. The near millimeter wavelength radiation from a distant astronomical point source is first focused by the telescope’s primary and secondary mirrors and then recollimated by an off-axis tertiary paraboloid for passage through a Twyman-Green interferometer. The end mirrors of the interferometer are situated so that the combination of tertiary paraboloid and beam splitter creates two identical images of the primary on their surfaces. By rotating one of the end mirrors out of its plane, the wavefronts are sheared with respect to each other, with the result that the focal plane pattern is scanned across the detector, where it interferes with the reference arm pattern. A 2-D Fourier transform of the focal plane data then yields the telescope’s aperture plane electric field. To separate the effects of different frequencies, the second end mirror is scanned. The resultant sheared interferograms, after being inverted, give the frequency dependence of the electric fields. Thus a 3-D Fourier transform of a grid of sheared interferograms simultaneously provides a measurement of the telescope surface at a number of frequencies.

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Ediss, G. A., N. J. Keen und J. W. M. Baars. „Telescope Constraints On Quasi-Optical Components For Submillimeter Radio Telescopes“. In 1985 International Technical Symposium/Europe, herausgegeben von Erik L. Kollberg. SPIE, 1986. http://dx.doi.org/10.1117/12.952329.

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Carter, William H. „Imaging sources in the near field of a radio telescope“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.wx1.

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The methods presently used to image sources with a radio telescope or similar optical interferometer all require that the sources are far enough away to be in the far field of the antenna array. However, new radio telescopes are being considered with spaceborne antenna arrays that are so large that some radio sources of interest are within their near field. A theoretical model is developed which appears to be useful for refocusing a radio telescope to image sources which are within the near field of the antenna array.

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Forte, Biagio, Richard Fallows, Mario M. Bisi, Pawel Flisek und Kacper Kotulak. „Measurement of radio wave scintillation through radio telescopes“. In XXXVth URSI General Assembly and Scientific Symposium. Gent, Belgium: URSI – International Union of Radio Science, 2023. http://dx.doi.org/10.46620/ursigass.2023.1296.takr2707.

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Escoffier, Raymond P., und John C. Webber. „Wideband correlators for radio astronomy“. In Astronomical Telescopes & Instrumentation, herausgegeben von Thomas G. Phillips. SPIE, 1998. http://dx.doi.org/10.1117/12.317375.

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Carlson, Brent. „Incoherent clocking for radio telescopes“. In Ground-based and Airborne Telescopes VIII, herausgegeben von Heather K. Marshall, Jason Spyromilio und Tomonori Usuda. SPIE, 2020. http://dx.doi.org/10.1117/12.2562643.

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Valente, G., A. Orfei, R. Nesti, A. Navarrini, S. Mariotti, P. Bolli, T. Pisanu et al. „Status of the radio receiver system of the Sardina Radio Telescope“. In SPIE Astronomical Telescopes + Instrumentation, herausgegeben von Wayne S. Holland und Jonas Zmuidzinas. SPIE, 2016. http://dx.doi.org/10.1117/12.2232880.

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Knapic, C., A. Zanichelli, E. Dovgan, M. Nanni, M. Stagni, S. Righini, M. Sponza, F. Bedosti, A. Orlati und R. Smareglia. „Radio data archiving system“. In SPIE Astronomical Telescopes + Instrumentation, herausgegeben von Gianluca Chiozzi und Juan C. Guzman. SPIE, 2016. http://dx.doi.org/10.1117/12.2232603.

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van Breugel, Willem J. „Highest redshift radio galaxies“. In Astronomical Telescopes and Instrumentation, herausgegeben von Jacqueline Bergeron. SPIE, 2000. http://dx.doi.org/10.1117/12.390129.

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Berichte der Organisationen zum Thema "Radio telescopes"

Yerin, Sergei, Alexander Stanislavsky, I. Bubnov, A. Konovalenko, P. Tokarsky und V. Zakharenko. Small-sized radio telescopes for monitoring and studies of solar radio emission at meter and decameter wavelengths. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, Juli 2019. http://dx.doi.org/10.31401/sungeo.2019.01.03.

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Stanislavsky, A., A. Konovalenko, A. Koval und Ya Volvach. An upgrade of the UTR-2 radio telescope to a multifrequency radio heliograph. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, Februar 2018. http://dx.doi.org/10.31401/sandg.2018.01.03.

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Slosar, Anže, und et al. Packed Ultra-wideband Mapping Array (PUMA): A Radio Telescope for Cosmology and Transients. Office of Scientific and Technical Information (OSTI), Juli 2019. http://dx.doi.org/10.2172/1558437.

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Francesco, Petruccione,, Gastrow, Michael, Hadzic, Senka, Limpitlaw, Justine, Paul, Babu Sena, Wolhuter, Riaan und Kies, Carl. Evaluation of Alternative Telecommunication Technologies for the Karoo Central Astronomy Advantage Area. Academy of Science of South Africa (ASSAf), 2021. http://dx.doi.org/10.17159/assaf.2021/0073.

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The National Research Foundation (NRF) requested the Academy of Science of South Africa (ASSAf), on behalf of South African Radio Astronomy Observatory (SARAO) and the Square Kilometre Array (SKA), to undertake an independent and objective evaluation of potential alternative telecommunication technologies for the areas of the Karoo Central Astronomy Advantage Areas (KCAAA). The study encompasses regulatory, public sphere, and technical dimensions to explore options for maintaining the functionality of the telescope while, at the same time, delivering appropriate connectivity solutions for local communities.The objectives of this study are as follows: 1) Assess the technologies currently being, or planning to be, deployed through existing alternative communications programs managed by SARAO, including whether these technologies are comparable with market available technologies that could feasibly be deployed in the KCAAA; and 2) Assessment of current and future telecommunication technologies that may act as suitable replacement and/or improvement (functional and feasible) for existing detrimental technologies, utilised in the KCAAA. This report provides a critical background into the relationship between the SKA and local communities as it relates to ICTs in the area. Based on this understanding, potential technology solutions are proposed to ensure residents of the KCAAA are still afforded valuable access to information and communication technologies (ICTs) within the parameters of affordability, desirability and feasibility.

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European VLBI Network. Bologna University Press, 2023. http://dx.doi.org/10.30682/9791254773864.

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The European VLBI Network (EVN) is a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa and Puerto Rico, which performs very high angular resolution observations of cosmic radio sources. This report comprises information on the EVN science, operations, observatory reports, activities, meetings, and publications over the biennium 2021-2022.

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