Results 121 to 130 of about 35,861 (225)

AGN jets under the microscope: A divide?

, 2012
A new paradigm for active galactic jet kinematics has emerged through detailed investigations of BL Lac objects using very long baseline radio interferometry.
Britzen, Silke, Eckart, Andreas, Karouzos, Marios, Witzel, Arno, Zensus, Anton J.   +4 more
core   +1 more source

Radio Interferometric Research of Ionosphere by Signals of Space Satellites

Open Astronomy, 2013
Since 2012, the Radiophysical Research Institute and the Lobachevsky State University at Nizhny Novgorod, Russia and the Ventspils International Radio Astronomy Centre at Irbene, Latvia are making radio interferometric experiments on study of ionosphere ...
Dugin N., Antipenko A., Bezrukovs V., Gavrilenko V., Dementjev A., Lesins A., Nechaeva M., Shmeld I., Snegirev S., Tikhomirov Yu., Trokss J.   +10 more
doaj   +1 more source

Applications of radio interferometry to navigation [PDF]

Radio astronomy experiments have demonstrated the feasibility of making precise position measurements using interferometry techniques. The application of this method to navigation and marine geodesy is discussed, and comparisons are made with existing ...
Hulburt, E. O., Johnston, K. J., Knowles, S. H.   +2 more
core   +1 more source

Geodetic Applications of Radio Interferometry

Eos, Transactions American Geophysical Union, 1983
These proceedings contain the papers presented during Symposium No. 5, Geodetic Applications of Radio Interferometry, of the International Association of Geodesy General Meeting held in Tokyo, May 7–8, 1982. The symposium, organized by the IAG Special Study Group 2.51 on Radio Interferometry, had eight sessions and 3 6 papers.
openaire   +1 more source

Accelerating the CLEAN algorithm of radio interferometry with convex optimization

Astronomy & Astrophysics
Context. In radio interferometry, images are recovered from incompletely sampled Fourier datasets. The de facto standard algorithm, the Cotton–Schwab CLEAN, iteratively switches between computing a deconvolution (minor loop) and subtracting the model ...
Müller Hendrik, Hsieh Mingyu, Bhatnagar Sanjay   +2 more
doaj   +1 more source

Solar VLBI [PDF]

In April, 1981, radio telescopes at Dwingeloo (The Netherlands) and Onsala (Sweden) were used as a long-baseline interferometer at a wavelength of 18 cm. The baseline of 619 km gave a spatial resolution on the Sun of about 45 km.
Kuijpers, J., Tapping, K. F.
core   +1 more source

Radio interference in the near-earth environment [PDF]

Natural and man-made radio frequency interference (RFI) are potentially serious obstacles to the successful operation of an array of spacecraft used for low frequency (1 to 30 MHz) radio interferometry in the near-earth environment.
Erickson, W. C.
core   +1 more source

Precision surveying using very long baseline interferometry [PDF]

Radio interferometry measurements were used to measure the vector baselines between large microwave radio antennas. A 1.24 km baseline in Massachusetts between the 36 meter Haystack Observatory antenna and the 18 meter Westford antenna of Lincoln ...
Clark, T. A., Coates, R., Corey, B. E., Counselman, C. C., Hinteregger, H. F., Ma, C., Robertson, D. S., Ryan, J. W., Shapiro, I. I., Wittels, J. J.   +9 more
core   +1 more source

Probing the Low-radio-frequency Emission in PG Quasars with the uGMRT. II

The Astrophysical Journal Supplement Series
We present results from uGMRT 685 MHz observations of 87 QSOs belonging to the Palomar–Green (PG) quasar sample with z  
Sanna Gulati, S. Silpa, P. Kharb, Luis C. Ho, S. Ghosh, J. Baghel   +5 more
doaj   +1 more source

Aliasing from Galactic Plane Setting in Widefield Radio Interferometry

The Astrophysical Journal
Measurements with widefield radio interferometers often include the near-infinite gradient between the sky and the horizon. This causes aliasing inherent to the measurement itself and is purely a consequence of the Fourier basis.
N. Barry, J. L. B. Line, C. R. Lynch, M. Kriele, J. Cook   +4 more
doaj   +1 more source