ITU-R P.1546方法在中国陆地典型区域适用性研究

Applicability of ITU-R P.1546 recommendation in typical terrestrial areas of CHINA

在解读、剖析ITU-RP.1546方法的基础上,通过对比北京周边平原地区和贵州喀斯特山区的测试结果和预测结果,分析了该方法在两类中国陆地典型区域的适用性.分析结果表明:1)在3s和30s高程精度下,平原地区均表现出较好的适应性,但提升高程精度可一定程度上减小预测误差;2)山区在3s高程精度下具有良好适应性,粗粒度的高程数据将对发射天线等效高度及场强插值、地形余隙角修正值产生较大影响,其中3s与30s高程精度下的地形余隙角修正值的均值相差30.85dB.研究结果可为ITU-R建议所提供传播预测方法的区域性应用及本地化研究等方面提供参考依据.

Based on the analysis of the ITU-R P.1546 recommendation, this paper compares the prediction results with the test results in the surrounding plain area of Beijing and Karst mountain area in Guizhou, and we analyzed the applicability of this method in two typical terrestrial areas of China. The results show that:(1) The terrain shows good adaptability at both 3 s and 30 s accuracy, and increasing the elevation accuracy can reduce the prediction error.(2) The prediction result of remote mountainous regions is only good at 3 s terrain accuracy. Coarse-grained elevation data can have a significant impact on the equivalent height of transmit antenna, as well as the field strength interpolation and the terrain clearance angle correction, and the average value of terrain clearance angle correction under 3 s and 30 s Terrain difference is 30.85 dB. The research results are of significance to for the regional application and localization research of the propagation prediction methods provided by ITU-R Recommendations.