Analysis and local application research on propagation prediction method for analogue FM broadcasting

Method for pointtoarea 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.