Results 1 to 10 of about 35,833 (197)
White Rabbit in radio interferometry. [PDF]
Exp Astron (Dordr)Abstract Radio interferometry relies on distributed telescopes having precise time and frequency sources that allow them to operate coherently over timescales up to several hours. As radio telescopes are being connected to fiber-based high-speed communication networks, it is of interest to make use of these for time and frequency ...
Boven EP +5 more
europepmc +5 more sources
The ionosphere and radio interferometry
Annals of Geophysics, 1997 This paper reviews the effects of the ionosphere on radio astronomjcal observations, what we can learn about the ionosphere from radio interferometry, and a procedure to correct for these effects.
T. A. Th. Spoelstra
doaj +3 more sources
Advances in Calibration and Imaging Techniques in Radio Interferometry [PDF]
Proceedings of the IEEE, 2009 This paper summarizes some of the major calibration and image reconstruction techniques used in radio interferometry and describes them in a common mathematical framework. The use of this framework has a number of benefits, ranging from clarification of the fundamentals, use of standard numerical optimization techniques, and generalization or ...
Urvashi Rau, Sanjay Bhatnagar
exaly +3 more sources
Efficient Range Estimation in Beat Radio Interferometry
IEEE Access, 2017 The beat radio interferometry (BRI) is a novel ranging scheme that achieves high accuracy with low-cost devices. A major problem with BRI is the lack of an efficient range estimation method that is valid in general measurement configurations and ...
Bing Xu, Wangdong Qi, Li Wei, Su Zhang
doaj +2 more sources
Demonstrating the Principles of Aperture Synthesis with Table- Top Laboratory Exercises [PDF]
EPJ Web of Conferences, 2019 Many undergraduate radio astronomy courses are unable to give a detailed treatment of aperture synthesis due to time constraints and limited math backgrounds of students.
Marr J.M. +6 more
doaj +1 more source
Demonstration of Ultrawideband Polarimetry Using VLBI Exploration of Radio Astrometry (VERA)
Galaxies, 2022 We report on recent technical developments in the front- and back-ends for the four 20 m radio telescopes of the Japanese Very-Long-Baseline Interferometry (VLBI) project, VLBI Exploration of Radio Astrometry (VERA). We present a brief overview of a dual-
Yoshiaki Hagiwara +5 more
doaj +1 more source
Observations of atmospheric gravity waves by radio interferometry: are results biased by the observational technique? [PDF]
Annales Geophysicae, 1997 In this paper we present a quantitative comparison between a large data base of medium-scale atmospheric gravity waves (AGWs) observed by radio interferometry of transionospheric radio sources and the results of a numerical simulation of the observed ...
C. Mercier, A. R. Jacobson
doaj +1 more source
Irregular Layout for a Satellite’s Interferometric Array
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021 We address the optimization problem of antenna placement on satellite-mounted interferometric synthetic-aperture instruments. In classic designs, the antennas on satellites are aligned regularly on the satellite’s frame.
Paul Krzakala +10 more
doaj +1 more source
MULTI-FREQUENCY RADIO INTERFEROMETRY ALGORITHM
Odessa Astronomical Publications, 2019 This article is a continuation of the work published in (Orlov, 2018). A method of multi-frequency beamforming of a radio interferometer is proposed. The model diagram is presented, which consists of two antenna arrays, filters, receivers and a signal ...
V. V. Orlov +2 more
doaj +1 more source
Sensors, 2020 An external modulation laser module assembly (EMLMA) is proposed to suppress nonlinear errors in an interferometry system and improve its measurement performance.
Tao Zhang +4 more
doaj +1 more source