The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, cloud attenuation on a Ka-band satellite propagation link in the tropical country of Singapore is investigated and analyzed. The satellite signal is received by a beacon receiver at 18.9 GHz. Through differentiating the clouds from rain events along the satellite link using weather Radar data, the cloud induced attenuation is experimentally estimated from the recorded beacon signal...
In this paper, preliminary results and analysis of cloud attenuation on a Ka-band satellite propagation link in tropical island of Singapore are reported. The received signal by a ground-based beacon receiver at 18.9 GHz was processed with a sliding window technique to minimize the system and scintillation effects. The results show that the Ka-band cloud attenuation is highly correlated with the observed...
In this paper, comparisons of radio-sounding profiles with different resolutions are performed for prediction of cloud attenuation in the tropical region. The Salonen and Uppala model which was reported to have an excellent prediction capability for cloud attenuation is used. One-month data is processed for calculating the height of cloud base, the 0°C isothermal level, and the cloud attenuation....
This study presented an economic model for estimating the land use structure changes based on Landsat Thematic Mapper (TM) imagery. The Lorenz Curve and Gini coefficient, derived from Economics, were introduced as tools for investigating and quantifying the land use structure changes from 1987 to 2007 in Xiamen, China. The results showed that the spatial Lorenz curve had the phenomenon of “three near...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.