对流层散射传播特性及信号谱特性分析  

Tropospheric Scatter Propagation Characteristics and Spectral Characteristics

作　　者：吴文溢 王万鹏[1] 熊益波[1] 王雷元[1] 陈西宏 WU Wenyi;WANG Wanpeng;XIONG Yibo;WANG Leiyuan;CHEN Xihong(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,西安710024

出　　处：《空间电子技术》2018年第5期35-41,共7页Space Electronic Technology

基　　金：国家自然科学基金资助项目(61172169)

摘　　要：文章介绍了3种对流层散射传播机制,并对不同参数下的对流层散射链路传输损耗进行了计算。结果表明,参数为5GHz频段和100km的典型散射链路,其传输损耗超过200dB。在广义散射截面模型的基础上建立了对流层散射信号传输函数模型,重点研究了对流层散射信号的延迟功率谱特性;从实际散射链路出发,对不同基线距离下的归一化延迟功率谱进行了计算和分析,结果表明,基线距离越远,则波束宽度越宽,相应的归一化延迟功率谱扩展越宽。The transmission loss and slow fading prediction mode of tropospheric scatter propagation are analyzed.The transmission loss of troposcatter link under different parameters is calculated.The results show that the transmission loss of typical scatter link with frequency of 5GHz and 100km exceeds 200dB.Based on the generalized scattering crossing-section model,a function model of the tropospheric scattering signal is established.The delay power spectrum of the tropospheric scattering signal is studied emphatically.Starting from the actual scattering link,the normalized delay power spectra at different baseline distances are calculated and analyzed.The results show that the farther the baseline distance is,the wider the wave speed width is,and the corresponding normalized delayed power spectrum spreads more widely.

关 键 词：对流层散射 传输损耗 衰落特性 延迟功率谱函数 

分 类 号：P228[天文地球—大地测量学与测量工程]