| |
| |
| |
|
Update of the wind energy potential of the Czech Republic from the perspective of year 2020
Hanslian, David
The study updates the preceding analyses of wind energy potential of the Czech Republic published in 2008 and 2012. The assumptions for the estimation of the future possibilities of wind energy development were updated with respect to the current and currently assumed future technological and social development. The new findings on the feasibility of realization of wind turbines, operation issues and energy production were taken into account. Beyond the scope of previous studies, the broader context was discusses, considering various limits of wind energy utilization, such as permitting issues, climate impacts or grid integration.
|
|
Total Electron Content Measurements by Single-Frequency GPS Receiver
Rejfek, Luboš ; Pitaš, K. ; Urbář, Jaroslav ; Chmelař, P.
In this paper is described the measurement of the Total Electron Content by the single-frequency GPS receiver. Disadvantage of this method is that it cannot be used for realtime processing. The advantages of the proposed method are that the device is cheaper than dual-frequency GPS receiver and it can reinterpret older valuable measurements by such singlefrequency receivers. The algorithm was tested with the dualfrequency receiver. Signal from selected frequency (f1, or f2) was processed by presented algorithm and results were compared with standard processing of the signals, which is used for the dual-frequency receivers. Results are promising.
|
| |
|
Mapping of radio-climatological parameters and their practical utility
Fišer, Ondřej ; Pek, Viktor ; Pitaš, Karel
Mapping of radioclimatological parameters in the form of digital or classic “paper“ maps is very useful for the planning of microwave satellite connections. Variables for simple calculation of water vapor attenuation (integrated water vapor content), clouding of cloud (integrated water content) and rainfall (precipitation intensity at 0.01%) are most often mapped. The formula for the distribution function of the attenuation is then relatively simple. Mapping is mostly done by ITU-R, ESA and WMCWF.
|
|
Vertical rain profile to estimate satellite signal attenuation
Fišer, Ondřej ; Pek, Viktor ; Pitaš, Karel
With respect to the propagation of electromagnetic waves in frequency bands above 10 GHz, the attenuation due to the passage of electromagnetic wave hydrometers (rain, fog, snow etc.) must be respected in the design of analogue and digital satellite connections. The attenuation of the hydrometeorists depends on the length of the connection, transmission frequency, polarization and climatic conditions.
|
|
Digisonde measurement
Kouba, Daniel ; Mošna, Zbyšek ; Koucká Knížová, Petra ; Boška, Josef ; Rejfek, Luboš
Ionospheric station in Průhonice currently performs its measurements using Digisonda DPS 4D. The vertical profile of the electron concentration can be measured by ionospheric vertical sounding using Ionosonde and Digisonde. The electron concentration profile shows the location of the layers of the ionosphere, the D, E, F1 and F2 layers, and the electron concentration at a given height. Another way to study the behavior of the ionosphere is to measure Doppler shift in ionospheric plasma. The Průhonická observatory is part of the Digisond World Network. The measured data is immediately automatically sent to the GIRO database (http://ulcar.uml.edu/DIDBase/).
|
| |