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清华大学学报(自然科学版)  2016, Vol. 56 Issue (6): 666-671    DOI: 10.16511/j.cnki.qhdxxb.2016.22.030
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能见度对垂直收发模式紫外散射信道的影响
孙禹, 詹亚锋
清华大学 宇航技术研究中心, 北京 100084
Effects of atmosphere visibility on an ultraviolet scattering channel with a vertical transmitter-receiver
SUN Yu, ZHAN Yafeng
Space Center, Tsinghua University, Beijing 100084, China
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摘要 基于光子计数检测信道模型与光子多次散射大气传播模型, 通过定量仿真, 研究大气能见度对不同收发间距下垂直收发模式紫外散射信道的路径损耗、多径时延扩展与二进制启闭键控(OOK)调制方式下系统可达速率的影响。仿真结果表明: 在给定收发间距下, 随着天气条件改善、能见度上升, 多径时延扩展随之增大, 光子在大气传播过程中的多径效应更显著; 当收发间距确定后, 存在最佳能见度使路径损耗最小, 当收发间距增大时, 该最佳能见度也随之上升; 当收发间距给定时, 存在最佳能见度与波特率使系统可达速率最大, 当收发间距增大时, 最佳能见度逐渐上升, 最佳波特率以及对应的可达速率最大值逐渐减小。
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孙禹
詹亚锋
关键词 能见度垂直收发紫外散射信道    
Abstract:The photon counting detection model and the multi-scattering photon propagation model were used to investigate the effects of atmosphere visibility on the path loss and delay spread of an ultraviolet scattering channel with a vertical transmitter-receiver and the achievable data rate with on-off keying (OOK) modulation. Simulations show that, at a given communication range, the delay spread increases with improving atmosphere visibility. When the communication range is set, there is a best visibility where the minimum path loss occurs and this best visibility increases with increasing communication range. For a given communication range, there are a best visibility and an optimum baud rate that maximize the achievable data rate. With large communication ranges, the best visibility increases while the optimum baud rate and the corresponding maximum achievable data rate decrease.
Key wordsatmosphere visibility    vertical transmitter-receiver    ultraviolet scattering channel
收稿日期: 2015-05-26      出版日期: 2016-07-01
ZTFLH:  TN929.12  
通讯作者: 詹亚锋, 副研究员, E-mail: zhanyf@tsinghua.edu.cn     E-mail: zhanyf@tsinghua.edu.cn
引用本文:   
孙禹, 詹亚锋. 能见度对垂直收发模式紫外散射信道的影响[J]. 清华大学学报(自然科学版), 2016, 56(6): 666-671.
SUN Yu, ZHAN Yafeng. Effects of atmosphere visibility on an ultraviolet scattering channel with a vertical transmitter-receiver. Journal of Tsinghua University(Science and Technology), 2016, 56(6): 666-671.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.030  或          http://jst.tsinghuajournals.com/CN/Y2016/V56/I6/666
  图1 光子运动轨迹图(散射次数n=2)
  表1 仿真参数设置
  图2 紫外散射信道脉冲响应
  表2 单次、多次散射模型下路径损耗、
多径时延扩展计算结果
  图3 不同波特率下的互信息与可达速率
  图4 不同能见度下的大气系数典型值
  图5 路径损耗随能见度变化曲线
  图6 多径时延扩展随能见度变化曲线
  图7 可达速率峰值随能见度变化曲线
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