Results 11 to 20 of about 1,806 (190)

Residual Entropy as a Diagnostic and Stopping Metric for CLEAN

The Astronomical Journal, 2023
We propose the use of entropy, measured from the spatial and flux distribution of pixels in the residual image, as a potential diagnostic and stopping metric for the CLEAN algorithm.
D. C. Homan, J. S. Roth, A. B. Pushkarev
doaj   +1 more source

Bayesian source discrimination in radio interferometry [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
Methods currently in use for locating and characterising sources in radio interferometry maps are designed for processing images, and require interferometric maps to be preprocessed so as to resemble conventional images. We demonstrate a Bayesian code - BaSC - that takes into account the interferometric visibility data despite working with more ...
P R Hague, H Ye, B Nikolic, S F Gull
openaire   +3 more sources

The Potsdam Open Source Radio Interferometry Tool (PORT) [PDF]

Publications of the Astronomical Society of the Pacific, 2021
Abstract The Potsdam Open Source Radio Interferometry Tool (PORT) is the very long baseline interferometry (VLBI) analysis software developed and maintained at the GFZ German Research Centre for Geosciences. Chiefly, PORT is tasked with the timely processing of VLBI sessions and post-processing activities supporting the generation of ...
Schuh, H., Heinkelmann, R., Beyerle, G., Anderson, J., Balidakis, K., Belda, S., Dhar, S., Glaser, S., Jenie, O., Karbon, M., Kitpracha, C., Küreç Nehbit, P., Liu, L., Lunz, S., Mammadaliyev, N., Modiri, S., Nilsson, T., Raut, S., Soja, B., Wang, J., Xu, M.   +20 more
openaire   +7 more sources

ANALYSIS OF DUAL-FREQUENCY INTERFEROMETRY APPLICABILITY FOR TARGET ELEVATION ANGLE MEASUREMENT USING TWO-COORDINATE RADARS [PDF]

Radio Physics and Radio Astronomy, 2023
Subject and Purpose. The study deals with the dual-frequency radio interferometry technique, which is based on the employment of two fairly close frequencies with the aim to remove ambiguity of the radar target elevation estimation using 2D-radar and ...
V. G. Galushko, O. M. Vlasenko, Y. V. Bulakh   +2 more
doaj   +1 more source

VHF Radio Interferometry of Lightning [PDF]

International Astronomical Union Colloquium, 1991
AbstractLightning discharges radiate strongly at radio frequencies, and studies of the radiation provide valuable information on lightning breakdown processes. Interferometric techniques can be used to locate the numerous radiation events as a function of time during a discharge and to generate images of the developing lightning channels inside a storm,
P.R. Krehbiel, X.M. Shao, R.J. Thomas, C.T. Rhodes, C.O. Hayenga   +4 more
openaire   +1 more source

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   +1 more source

On the RFI Detection in Differential Interferometric Synthetic Aperture Radar [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Synthetic Aperture Radar (SAR) can image the ground with a wide area and high resolution at all times and in all weather and has become an important means of remote sensing.
Y. Liu, M. Tao, J. Li, T. Li, J. Chen
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Time resolution of cosmic noise observations with acorrelation experiment [PDF]

Annales Geophysicae, 2004
A radio wave correlation experiment using a Mills Cross technique can be used to observe the cosmic noise intensity from the ground for the purpose of determining the absorption in the ionosphere.
E. Nielsen, F. Honary, M. Grill
doaj   +1 more source

Pilot Study and Early Results of the Cosmic Filaments and Magnetism Survey with Nenufar: The Coma Cluster Field

Galaxies, 2021
NenuFAR, the New Extension in Nancay Upgrading LOFAR, is currently in its early science phase. It is in this context that the Cosmic Filaments and Magnetism Pilot Survey is observing sources with the array as it is still under construction—with 57 (56 ...
Etienne Bonnassieux, Evangelia Tremou, Julien N. Girard, Alan Loh, Valentina Vacca, Stéphane Corbel, Baptiste Cecconi, Jean-Mathias Grießmeier, Léon V. E. Koopmans, Michel Tagger, Gilles Theureau, Philippe Zarka   +11 more
doaj   +1 more source

Testing of the transionospheric radiochannel using data from the global GPS network

Annals of Geophysics, 2003
Using the international ground-based network of two-frequency receivers of the GPS navigation system provides a means of carrying out a global, continuous and fully-computerized monitoring of phase fluctuations of signals from satellite-borne ...
V. A. Karachenschev, E. L. Afraimovich
doaj   +1 more source