海雾对3毫米波传播特性的影响研究  

SEA FOG EFFECTS ON RADIOWAVE PROPAGATION AT 3mm WAVELENGTH

作　　者：沈广德[1] 赵振维[1] 林乐科[1] 金燕波[1] 

机构地区：[1]中国电波传播研究所青岛分所,山东青岛266071

出　　处：《红外与毫米波学报》2000年第6期478-480,共3页Journal of Infrared and Millimeter Waves

摘　　要：进行了海雾对 3mm传播特性影响的测量实验 .浓度大的海雾对 3mm信号衰减达 7.5 5 d B/ km ,推算了海雾的特性参数 ,对不同能见度下的测量结果和用 ITU模式计算的结果进行了比较 。The experiments on 3mm radiowave propagatin attenuation induced by sea fog were carried out. The results show that dense fog induces 7.55dB/km attenuation at 3mm. The sea fog characteristic parameters were calculated. The measured attenuation was compared with that calculated by ITU model at different visibility. Signal scintillation characteristics were analyzed. Key words 3mm communication, attenuation, visibility, scintillation index.um 11211$$$$ YANG Cheng yongSchool of Life Sciences,Zhongshan University,Guangzhou 510275,China,ZHOU Shi ning,ZHOU Yi pin,LIN Yong cheng Abstract:Bacterium 11211 which produces chitinase was isolated from the South China Sea.The growth condition and chitinase production of bacteria were investigated.Na + was necessary for bacterium 11211 growth.Colloid chiyin could induce bacteria to produce chitinase.The growth of bacteria was slow in the medium containing colloid chitin as main carbon source,and the enzyme activity reached maximum on 7 d of incubation.Following the purification,the enzyme was characterized and its molecular weight was estimated by SDS PAGE.

关 键 词：海雾 毫米波 衰减系数 能见度 闪烁指数 毫米波通信 闪烁频谱 信号闪烁 毫米波雷达 

分 类 号：TN928[电子电信—通信与信息系统] TN011[电子电信—信息与通信工程]