Zobrazeno 1 - 10
of 45
pro vyhledávání: '"R. P. Linfield"'
Autor:
R. P. Linfield
Publikováno v:
International Astronomical Union Colloquium. 175:141-144
The ST3 mission will launch a space optical interferometer into heliocentric orbit, for observation of 50–100 sources on baselines of 40–200 m, during a time span of 3–4.5 months. The angular resolution in the 450–900 nm passband will be ≈
Publikováno v:
Radio Science. 34:1475-1484
Vertical resolution is a fundamental aspect of any atmospheric remote sensing technique. Occultations using the Global Positioning System (GPS) signals provide inherently high vertical resolution. The phase coherence of the GPS signals allows improve
Autor:
R. P. Linfield, Stephen Keihm, Michael J. Mahoney, P. Kroger, Yoaz Bar-Sever, Alan Tanner, L. P. Teitelbaum, G. M. Resch
Publikováno v:
Planetary and Space Science. 46:1257-1261
The signals from the Cassini spacecraft that will be used for radio science experiments will be affected by delay fluctuations in the Earths atmosphere. These fluctuations are dominated by water vapor in the troposphere, and in the case of the gravit
Autor:
R. P. Linfield
Publikováno v:
Radio Science. 33:1353-1359
The spectrum of tropospheric phase fluctuations expected for a radio antenna at timescales < 100s on a space to ground link has been calculated. A new feature included in these calculations is the effect of aperture averaging, which causes a reductio
Observing Earth's atmosphere with radio occultation measurements using the Global Positioning System
Publikováno v:
Journal of Geophysical Research: Atmospheres. 102:23429-23465
The implementation of the Global Positioning System (GPS) network of satellites and the development of small, high-performance instrumentation to receive GPS signals have created an opportunity for active remote sounding of the Earth's atmosphere by
Publikováno v:
Geophysical Research Letters. 23:3719-3722
The ability of water vapor radiometers (WVRs) to calibrate changes in tropospheric delay was demonstrated during very long baseline radio interferometer (VLBI) observations at Goldstone, California. WVR measurements reduced the observed VLBI delay va
Autor:
S. J. Walter, R. P. Linfield, R. N. Treuhaft, Michael J. Mahoney, Stephen Keihm, L. J. Skjerve, L. P. Teitelbaum
Publikováno v:
Radio Science. 31:129-146
Simultaneous very long baseline interferometry (VLBI) and water vapor radiometer (WVR) measurements on a 21-km baseline showed that calibration by WVRs removed a significant fraction of the effect of tropospheric delay fluctuations for these experime
Autor:
R. P. Linfield
Publikováno v:
International Astronomical Union Colloquium. 123:271-274
VLBI observations using a satellite in earth orbit and ground antennas in Japan and Australia were conducted in 1986, 1987, and 1988. Sources were detected on space-ground baselines at both observing frequencies: 2.3 and 15 GHz. The coherence on spac
Data from the Palomar Testbed Interferometer, with a baseline length of 110 m and an observing wavelength of $2.2 ��{\rm m}$, were used to derive information on atmospheric turbulence on 64 nights in 1999. The measured two-aperture variance coher
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d89864b8e47c9eb350619300f26e274
http://arxiv.org/abs/astro-ph/0102052
http://arxiv.org/abs/astro-ph/0102052
Autor:
J. S. Ulvestad, R. P. Linfield
Publikováno v:
International Astronomical Union Colloquium. 164:397-398
We are developing a future space VLBI mission, ARISE, that would involve placing a VLBA-equivalent radio telescope in a highly elliptical Earth orbit. The telescope would operate at VLBI frequencies of 5, 22, 43, and 86 GHz, as well as being capable