Zobrazeno 1 - 10
of 48
pro vyhledávání: '"S. von Hoerner"'
Autor:
Woon-Yin Wong, S. von Hoerner
Publikováno v:
1979 Antennas and Propagation Society International Symposium.
Most antennas have strong gravitational astigmatism and vary as a function of the antenna position. We suggested that this kind of surface error could be corrected away if a subreflector is mechanically deformed in a proper way [l]. Analyses by ray t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09bc5b14896dcbf7bd2a4295508735a6
https://doi.org/10.1109/aps.1979.1148042
https://doi.org/10.1109/aps.1979.1148042
Autor:
S. von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 28:652-657
Beam mapping at 1.3-cm wavelength has shown very strong sidelobes at the 140-ft telescope, up to four lobes in a row when pointing far west. Different types of observations and the theory of coma lobes lead in good agreement to the conclusion that th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44dd86521cec8f8682fc66348565057b
https://doi.org/10.1109/tap.1980.1142393
https://doi.org/10.1109/tap.1980.1142393
Autor:
S. von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 26:464-471
For future low-noise receivers, future radio telescopes must avoid the pickup of ground radiation, and for obtaining the maximum gain with a given diameter, they should be shaped two-mirror systems. A configuration with a double asymmetry is suggeste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b48421015ab6fb92d2e81532506a454
https://doi.org/10.1109/tap.1978.1141866
https://doi.org/10.1109/tap.1978.1141866
Autor:
S. Von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 26:315-318
Most conventional radio telescopes will show a strong astigmatism when tilted, resulting in surface degradation, which can be corrected with a mechanically deformable subreflector. Astigmatism means different focal lengths ( \Delta F ) in two perpend
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a40fbed29b38bd39cdcc5e9096eb53b0
https://doi.org/10.1109/tap.1978.1141827
https://doi.org/10.1109/tap.1978.1141827
Autor:
S. von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 24:336-340
A computer program called DERIVE is described for the design of the reflecting surfaces of two-mirror radio telescopes. It calculates the shape of a secondary reflector to any given primary by use of geometrical optics, yielding zero path length erro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3fe5f577178a619f1855f6d7801046cc
https://doi.org/10.1109/tap.1976.1141333
https://doi.org/10.1109/tap.1976.1141333
Autor:
S. von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 29:953-958
Surface plates with four adjustment screws, one at each corner, allow four degrees of freedom for their adjustment, including an internal nonplanar twist or warp. Thus the surface deformations of trapezoidal plates under enforced twists are investiga
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf2ae5ebb535acd0906b35b962ce22d1
https://doi.org/10.1109/tap.1981.1142681
https://doi.org/10.1109/tap.1981.1142681
Autor:
S. von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 26:857-860
A method is suggested where a reference feed is fixed at the telescope focus, and a second feed has a lateral offset and scans the focal plane. The telescope tracks a celestial radio source, and the receiver measures the phase difference at the two f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0203f9af33b846a9d63e5a3851b0fa00
https://doi.org/10.1109/tap.1978.1141948
https://doi.org/10.1109/tap.1978.1141948
Autor:
Woon-Yin Wong, S. Von Hoerner
Publikováno v:
IEEE Transactions on Antennas and Propagation. 27:720-723
Like most conventional radio telescopes, the 140-ft at the National Radio Observatory (NRAO), Green Bank, WV, is limited in its short-wave performance by gravitational deformations, whose main part is of an astigmatic shape with elevation-dependant a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5177c077a4552aa1f4284fcc19a736d
https://doi.org/10.1109/tap.1979.1142142
https://doi.org/10.1109/tap.1979.1142142
Autor:
K. E. Rothschuh, S. Flügge, H. Mayer-Kaupp, S. von Hoerner, S. Brandt, G. Tölg, K. Dimroth, B. Lindman, D. Babel, R. Zahradník, P. Hemmerich, H. H. Cramer, K. H. Kreeb, H. Autram, H. Ziegler, P. Innerhofer, W. Boschke, R. Schröter, F. Vogel
Publikováno v:
Naturwissenschaften. 65:164-168
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83dfd097fcc83dd4bd7ee1a9ef6aff04
https://doi.org/10.1007/bf00440358
https://doi.org/10.1007/bf00440358
Autor:
S. von Hoerner, Woon-Yin Wong
Publikováno v:
IEEE Transactions on Antennas and Propagation. 23:689-695
An ideal telescope structure would deform, when tilted, in a homologous way, from one paraboloid of revolution to another one. Conventionally designed telescopes approach this condition already to some degree, special designs to a very high degree, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::95474b2f812e447f4a1a98f948bb40a1
https://doi.org/10.1109/tap.1975.1141163
https://doi.org/10.1109/tap.1975.1141163