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National Repository of Grey Literature

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	Propagation of very low frequency radio waves in the Earth-ionosphere waveguide Guth Jarkovský, Jiří ; Santolík, Ondřej (advisor) ; Píša, David (referee) Lightning strokes emit strong electromagnetic (EM) radiation, mostly in the very low frequency band (VLF) 3-30 kHz. This radiation propagates in the Earth-ionosphere wa- veguide across distances of thousands of kilometres. Using measurements of several com- ponents of the EM feld, it is possible to determine the direction of arrival of an EM wave. The main result of this thesis is an algorithm for this analysis and its application to data measured by a station located in southern France. The algorithm was used to determine the direction of arrival of signal from several lightning strokes with known locations as well as from emitters used for submarine communication, as those also emit waves in the VLF band and thus are also suitable for application of the algorithm. 1 Detailed record
	Drop size distribution applied to microwaves Fišer, Ondřej This study shows the global influence of the atmosphere (rain, cloud, water vapour) on the attenuation of radio waves. Selected models predicting the atmospheric attenuation are shown. Detailed record
	Basic Study of the Radio Refractive Index Values in CZ and Sensitivity Tests Fišer, Ondřej The radio refractive index was computed from the data of radio soundings in Prague and the statistical results are shown. Detailed record
	Performance and Reliability of Advanced Telecommunication Systems Using Millimetre Wavelengths in the Czech Republic Kvičera, V. ; Fišer, Ondřej ; Mazánek, M. This contribution informs about the launched GACR grant, its aims and methods. The aim is to improve the radio link planning with respect to the influence of the atmosphere. Particular topics are: radio refractive study and measurements, long term rain rate statistics and its stability, experimental measurement of attenuation on 58 GHz link and comparison of predicted and measured atmospheric attenuation. Detailed record
	Research of Rain Rate Statistics, Rain Type Recognition and Radio Refractive Index Computation in Space in order to improve the Radiocommunication Planning Fišer, Ondřej This contribution informs about the contribution of the Institute of Atmospheric Physics in Prague to the described grant of GACR. Particularly it is: radio refractive index study, long term rain rate statistics and its stability as well as rain rate measurements, rain type assessment and experimental measurement of attenuation on 58 GHz link. Detailed record

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