地空路径海面多径衰落实用化预测技术

A Practical Prediction Technique for Multipath Fading due to set on Earth-Space Paths

本文在文献［２—４］的基础上，进一步提出了海事卫星移动业务海面多径衰落的完整的、实用化的预测技术。此预测技术的适用频率范围为０．２５～８ＧＨＺ，比相应的ＩＴＵ—Ｒ预测方法的适用范围１～２ＧＨＺ大大扩展。其中既考虑了粗糙海面情况，又考虑了非粗糙海面情况，并且给出了全套计算步骤、公式和曲线。同时，本文进一步提出了抑制平静海面镜反射效应的舰载天线高度设计技术。

A complete and practical prediction technique for the multipath fading due to sea in the maritime mobile-satellite service is further presented on the basis of references[2-4]. The frequency rallge baed for the technique is from 0.25 to 0.8GHz which is much broader than the rlinge 1～2GHI for the relevant ITU-R prediction method[1].berth the rough and non-rough sea surfaces cases are covered, and a complete set of calculation steps, formulas and curves is given.Meanwhile, a design technique of ship antenna height is pr～nted for the reduction of the effects of the specular reflection under the calm sea condition.