Chen B.,573 Station |
Wang J.,China Research Institute of Radiowave Propagation |
Yang H.,573 Station |
Zhang J.,573 Station |
Su H.,China Research Institute of Radiowave Propagation
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2013
Method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3000 MHz, which was recommended in ITU-R P. 1546, is analyzed. Field strength of FM broadcasting system is collected, which had about a 360° azimuth form 0.93° to 351.07°, and distance from 2 km to 120 km. Then, the theoretical prediction of field strength based on ITU-R P. 1546 is compared with observation data, and it proves that the recommendation ITU-R P. 1546 is valid in China region. In the end, how recommendation ITU-R P. 1546 can be better applied to analyze FM broadcasting service is suggested: firstly, using more detailed terrain height database with a step less than 1km; secondly, take full account of detailed cover information of urban, suburban, and rural area; thirdly, using the observation or statistical analysis of vertical atmospheric refractivity gradient of China area; fourthly, adjusting values of variability standard deviations in certain planning situations. The study enhances the accuracy of propagation characteristics, and give basis of plan for FM broadcast system, which make a basis for local research of ITU-R method in China region. Copyright © 2013 by Editorial Department of Chinese Journal of Radio Science.