海上超视距传输信号衰落分布分析  

Fading distribution analysis of trans-horizon signal propagation over the sea-path

作　　者：张利军[1,2] 韩慧 张蕊[2] 王红光[2] 康士峰[2] 赵振维[2] 

机构地区：[1]电子信息系统复杂电磁环境效应国家重点实验室,河南洛阳471003 [2]中国电波传播研究所,电波环境特性及模化技术重点实验室,山东青岛266107

出　　处：《电波科学学报》2013年第3期535-539,546,共6页Chinese Journal of Radio Science

基　　金：电子信息系统复杂电磁环境效应国家重点实验室基金(CEMEE2012K0101A)

摘　　要：利用我国渤海海域X波段107km超视距传输外场测试数据开展统计分析,给出了海上超视距传输信号的快衰落分布以及瞬时信号的快慢衰落组合分布.链路预估的理论结果表明:海上蒸发波导环境下的超视距传输信号电平远远高于散射传输电平,接近自由空间传输的情形.链路试验结果表明:7月15日海上环境下的信号接收电平可比对流层散射传输损耗中值高40dB,其信号幅度分布服从瑞利分布;7月18日的信号接收电平起伏较大,具有波导增强型衰落的特点,低电平趋近于对流层散射传输中值电平,信号幅度分布趋近于标准偏差在4～10dB之间的瑞利分布与对数正态分布组合分布.The trans-horizon signal over the Bohai sea which is realized under the condition of the duct at X band with a length of 107 km is analyzed statistically. The fast fading distribution and the combined fast and slow fading distribution are given in this paper. The theoretical results show that the trans-horizon received level in the case of evaporation duct is much higher than the level of troposphere scatter and nearly as same as the case of free space. The experimental results show that the signal amplitude distribution is approximately Rayleigh distribution when it is occurred on July 15 and it is approximately combined log-normal and Rayteigh distribution with a standard deviation of 4~10 dB when it is occurred on July 18. The received signal of July 15 is 40 dB higher than the troposphere scattering sig- nal. The received signal of July 18 is enhanced due to ducting and nearly the extent as the troposphere scatter propagation in the lower.

关 键 词：超视距 蒸发波导 瑞利分布 对数正态分布 组合分布 

分 类 号：TN011[电子电信—物理电子学]