Zobrazeno 1 - 10
of 123
pro vyhledávání: '"V. Kvicera"'
Publikováno v:
Radioengineering, Vol 21, Iss 3, Pp 911-916 (2012)
Simultaneous measurements of the liquid water content (LWC) and optical attenuation have been analyzed to predict optical attenuation caused by fog particles. Attenuation has been measured at two different wavelengths, 830 nm and 1550 nm, across co-l
Externí odkaz:
https://doaj.org/article/22c727c1c8ed4c208a0199ee015ad397
Autor:
M. Grabner, V. Kvicera
Publikováno v:
Radioengineering, Vol 21, Iss 1, Pp 455-458 (2012)
The structure constant of the atmospheric refractive index is used for characterizing the turbulence strength and for predicting the scintillation of electromagnetic waves in atmosphere. It is measured continuously in Prague using an optical scintill
Externí odkaz:
https://doaj.org/article/63e5c6f44956461ba200486ee5504308
Publikováno v:
Radioengineering, Vol 19, Iss 4, Pp 596-600 (2010)
Free Space Optics (FSO) has the great potential for future communication applications. However, weather influenced reduced availability had been the main cause for its restricted growth. Among different weather influences fog plays the major role. A
Externí odkaz:
https://doaj.org/article/154bc928cfad47eab18f8a71ec00db0c
Publikováno v:
Radioengineering, Vol 19, Iss 2, Pp 254-261 (2010)
Results of a propagation study on a free space optical link at 850 nm on a path 853 meters long and on a parallel 58 GHz radio link obtained over a 3-year period of observation are presented. The cumulative distributions of attenuation due to all of
Externí odkaz:
https://doaj.org/article/92a2a60f1b4949a082b856fde1c6c11c
Publikováno v:
Radioengineering, Vol 19, Iss 1, Pp 117-121 (2010)
This work presents the results of a terrestrial multiple-receiver radio link experiment at 10.7 GHz. Results are shown in the form of the power levels recorded at several antennas attached to a receiving mast. Comparisons of the measurement data with
Externí odkaz:
https://doaj.org/article/77f75658d102490e98b5ec2c4803bdac
Publikováno v:
Radioengineering, Vol 16, Iss 3, Pp 7-12 (2007)
The BER and the availability belong among the basic qualitative parameters of free space optical (FSO) links. The BER parameter is usually mentioned by FSO manufacturers, but it is not defined what conditions a certain value of BER stands for. This a
Externí odkaz:
https://doaj.org/article/fe51a028522a4418b49301cd2cb1f938
Publikováno v:
Radioengineering, Vol 14, Iss 4, Pp 27-32 (2005)
Two studies of the outdoor propagation of 60 GHz microwaves aredescribed. The focus of this paper is the relationship between rainfalland measured attenuation of the microwave signal. Experimental data arepresented and the measured statistics are com
Externí odkaz:
https://doaj.org/article/3330d924ebc5484f84af1e3133f5ebdf
Publikováno v:
Radioengineering, Vol 14, Iss 1, Pp 32-36 (2005)
Rain attenuation has a significant impact on the availability ofmillimeter wave communication systems. In order to dynamically simulatesuch radio systems, several generators of artificial time series ofrain attenuation have been developed. This paper
Externí odkaz:
https://doaj.org/article/abb98b4abb33432db92d9c8c667a9aa2
Autor:
V. Kvicera, M. Grabner
Publikováno v:
Radioengineering, Vol 12, Iss 4, Pp 50-54 (2003)
Propagation of radio waves under clear-air conditions is affected bythe distribution of atmospheric refractivity between the transmitterand the receiver. The measurement of refractivity was carried out onthe TV Tower Prague to access evolution of a r
Externí odkaz:
https://doaj.org/article/21035b6225354badb25d1f39dff38d9a
Autor:
V. Kvicera, M. Grabner
Publikováno v:
Radioengineering, Vol 12, Iss 1, Pp 5-7 (2003)
Propagation related parameters are used for design and frequencyplanning of microwave networks. Atmospheric refractive index is theimportant parameter that influences the propagation of electromagneticwaves during so-called "clear sky" conditions. Th
Externí odkaz:
https://doaj.org/article/54a138ae1b3d4fac95195a062d351847