星地光通信中PAT链路的衰落冗余

马 晶; 高 宠; 谭立英; 于思源

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星地光通信中PAT链路的衰落冗余

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- 星地光通信中PAT链路的衰落冗余
- Fade budgets of PAT link in satellite-to-ground optical communications
- 光学精密工程 2007年15卷第3期页码：308-313
- 作者机构：
  
  哈尔滨工业大学可调谐激光技术国家级重点实验室,黑龙江哈尔滨 150001
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： TN929.12
- 收稿日期：2007-01-02，
  
  修回日期：2007-02-17，
  
  网络出版日期：2007-06-30，
  
  纸质出版日期：2007-06-30
- 稿件说明：
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马晶, 高宠, 谭立英, 等. 星地光通信中PAT链路的衰落冗余[J]. 光学精密工程, 2007,15(3):308-313.

MA Jing, GAO Chong, TAN Li-ying, et al. Fade budgets of PAT link in satellite-to-ground optical communications[J]. Optics and precision engineering, 2007, 15(3): 308-313.
马晶, 高宠, 谭立英, 等. 星地光通信中PAT链路的衰落冗余[J]. 光学精密工程, 2007,15(3):308-313. DOI：

MA Jing, GAO Chong, TAN Li-ying, et al. Fade budgets of PAT link in satellite-to-ground optical communications[J]. Optics and precision engineering, 2007, 15(3): 308-313. DOI：

摘要

在考虑大气闪烁、静态瞄准误差和瞄准抖动的影响下

导出了大天顶角和小天顶角传输链路的强度起伏概率密度函数

给出了跟踪中断概率随衰落冗余变化的关系表达式;最后分析了最佳的光束发散角

并对概率密度分布规律和跟踪中断概率随衰落冗余变化的规律进行了模拟分析。结果表明

对于上行和下行链路

光束发散角与瞄准抖动误差均方值的最佳比值为4和6。在最佳光束发散角下

要想确保链路跟踪中断概率小于10

-3

上行链路需要10 dB的衰落冗余

下行链路需要3 dB的衰落冗余

克服了星地光通信中强度起伏对链路跟踪稳定性的影响

保证了在跟踪过程中链路所需要的衰落冗余。

Abstract

To achieve enough fade budgets for reliable link in satellite-to-ground optical communications

the expressions for the total probability density functions of signal intensity fluctuation are derived at large zenith angles and small zenith angles considering atmospheric scintillation

static pointing error and pointing jitter and relation of the lost-tracking probability variable with fade budgets is given. Finally

the total probability density function and lost-tracking probability are simulated. Experimental results show that the ratio of the optimal beam divergent angle to the square root of the variance of the pointing jitter for uplink and downlink is 4 and 6; the required fade budget at a lost-tracking probability of 10

-3

is 10 dB and 3 dB for uplink and downlink.

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Keywords

references

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