Results 151 to 160 of about 1,806 (190)
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Astronomical radio interferometry
Nature Reviews Methods Primers, 2023Yoshiharu Asaki +4 more
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General relativity and radio interferometry
The Physics Teacher, 1976A summary is given of the radiowave bending experiment conducted at NRAO to check the validity of Einstein’s General Relativity theory ...
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Photonic radio frequency phase-shift amplification by radio frequency interferometry
Optics Letters, 2015We present a new technique for radio frequency (RF) phase-shift amplification based on RF interferometry and demonstrate it in an optical system. A striking feature of this amplifier is that the input phase noise is not amplified together with the input phase signal, so the phase sensitivity improves with higher phase amplification.
Moshe Ben, Ayun +4 more
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Regularization methods in radio interferometry
Radiophysics and Quantum Electronics, 2007The problem of image retrieval in radio interferometry is a classical example of an ill-posed problem. In this paper, we consider a new approach to the radio-interferometric imaging based on regularization, which is computationally more flexible. A new type of a weighting function suitable for managing the interferometer antenna pattern is obtained ...
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Radio and Optical Interferometry
2004This lecture will cover the basics of astronomical interferometers as imaging devices. The basic response of such an instrument to celestial signals is covered as well as the relationships between what can be measured and what is desired, i.e. the brightness distribution on the sky. This topic is covered in much detail in [11], [10].
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Geodesy by Radio Interferometry
1977By the use of radio-interferometric observations of extragalactic radio sources it is possible to determine all three components of an interferometer “baseline” vector, which extends from one radio antenna to another, with respect to an inertial coordinate system.
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Radio Interferometry of Discrete Sources
Proceedings of the IRE, 1958Salient features of the theory and practice of radio interferometry are presented with special attention to assumptions and to the specifically two-dimensional aspects of the subject. The measurable quantity on an interferometer record is defined as complex visibility by generalization from an analogous quantity in optical interferometry.
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Radio Interferometry Applied to Geodesy
IRE Transactions on Military Electronics, 1960Mark II Minitrack, a basic type of radio interferometer, is used to obtain observational data from artificial earth satellites. It is assumed that the antenna field pattern can be approximated by a family of coaxial cones whose common apex is the electrical center of the system.
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Spacetoground Interferometry for Radio Astronomy
2009This chapter contains sections titled: Radio Astronomy Space VLBI The HALCA Satellite HALCA Science Subsystem VSOP Observations The Future of Space VLBI Acknowledgements ...
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