气象条件对近地视距光通信链路的影响研究
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摘要
本文对建立于3．4km的近地视距光通信链路在不同气象条件下的工作情况进行了详细分析和理论探讨，给出了霾、雾、雨、大气湍流对光通信链路的影响结果，并就大气衰减信道和大气湍流信道进行了理论分析。本文的第一章对激光通信及大气激光通信的发展作了一简要概括。第二章简要介绍了大气对光束传输和大气激光通信的影响，它是我具体工作(第四—第六章)的基础。
第三章介绍了实验所建立的大气光通信链路及所用设备，给出了总体实验结果和不同天气情况下的系统误码率。
第四章给出了霾、雾、雨对光通信链路的具体影响结果，分别就它们的衰减系数进行了计算，分析了它们造成系统误码的原因。
第五章给出了晴好天气下实验中记录的光强闪烁，观察到了和理论结果相一致的大气闪烁日变化，根据弱湍流理论估算了大气湍流的强弱程度，给出了光强闪烁和系统误码率变化曲线，分析了大气湍流条件下的误码原因并就其特点和第四章的结果进行了比较。
第六章给出了大气衰减信道中衰减系数和系统误码率的数值计算图，得到了和雾、霾影响结果基本一致的变化曲线。计算了不同湍流强度下系统的探测概率并就实验结果进行了分析。最后比较了桂林、北京
广西大学硕士论文
两地的气象条件和通信惰况。
This paper researched the performance of 3 . 4km line-of-sight laser link under different weather conditions. Effects of haze, fog, rain and atmosphere turbulence on the BER of experimental link are given and theoretical analysis is taken through two communication channel models梐ttenuation channel and turbulence channel. In chapter l,we give a summary of laser communication and the development of atmosphere laser communication. In chapter 2,we introduce roughly effects of atmosphere on the propagation
of laser beams and the laser communication system. They are the general bases of my concrete work (chapter4 to chapter 6).
Chapter 3 introduces the experimental link and its instruments. The overall experimental results and the BER of communication system under different weather conditions are given.
Chapter 4 gives the effects of haze, fog and rain on the BER of optical communication link and calculates their extinction coefficient. The major reasons of cause to the experimental link's BER are discussed.
In chapter 5, experimental results of intensity fluctuation in fine day are given and expected variations in the scintillation over the course of a day are observed. In there, we calculate the turbulent intensity through weak turbulent theory, report the overall BER of link in the presence of strong scintillation, and analyze why cause to the BER. Besides, the characters of BER are comparied with the results of chapter 4.
Chapter 6 obtains the BER as function of extinction coefficient by attenuation channel model, which fit for experimental link when thick haze and fog presented. And then we calculate the detection probability of communication system under different turbulent intensity and analyze the relation to BER. In the end, we compare the overall experimental results between Guilin and Beijing.
第三章介绍了实验所建立的大气光通信链路及所用设备，给出了总体实验结果和不同天气情况下的系统误码率。
第四章给出了霾、雾、雨对光通信链路的具体影响结果，分别就它们的衰减系数进行了计算，分析了它们造成系统误码的原因。
第五章给出了晴好天气下实验中记录的光强闪烁，观察到了和理论结果相一致的大气闪烁日变化，根据弱湍流理论估算了大气湍流的强弱程度，给出了光强闪烁和系统误码率变化曲线，分析了大气湍流条件下的误码原因并就其特点和第四章的结果进行了比较。
第六章给出了大气衰减信道中衰减系数和系统误码率的数值计算图，得到了和雾、霾影响结果基本一致的变化曲线。计算了不同湍流强度下系统的探测概率并就实验结果进行了分析。最后比较了桂林、北京
广西大学硕士论文
两地的气象条件和通信惰况。
This paper researched the performance of 3 . 4km line-of-sight laser link under different weather conditions. Effects of haze, fog, rain and atmosphere turbulence on the BER of experimental link are given and theoretical analysis is taken through two communication channel models梐ttenuation channel and turbulence channel. In chapter l,we give a summary of laser communication and the development of atmosphere laser communication. In chapter 2,we introduce roughly effects of atmosphere on the propagation
of laser beams and the laser communication system. They are the general bases of my concrete work (chapter4 to chapter 6).
Chapter 3 introduces the experimental link and its instruments. The overall experimental results and the BER of communication system under different weather conditions are given.
Chapter 4 gives the effects of haze, fog and rain on the BER of optical communication link and calculates their extinction coefficient. The major reasons of cause to the experimental link's BER are discussed.
In chapter 5, experimental results of intensity fluctuation in fine day are given and expected variations in the scintillation over the course of a day are observed. In there, we calculate the turbulent intensity through weak turbulent theory, report the overall BER of link in the presence of strong scintillation, and analyze why cause to the BER. Besides, the characters of BER are comparied with the results of chapter 4.
Chapter 6 obtains the BER as function of extinction coefficient by attenuation channel model, which fit for experimental link when thick haze and fog presented. And then we calculate the detection probability of communication system under different turbulent intensity and analyze the relation to BER. In the end, we compare the overall experimental results between Guilin and Beijing.
引文
1．胡渝，刘华，空间激光通信技术及其发展，电字科技大学学报，1998，27(5)：453-461
2．卢全文，光通信概述，光通信技术，1997，21(3)：171-179
3．黄怀诚编《激光通信》，国防工业出版社，1976
4．蔡燕民，陈刚，董作人等，155Mbit／s大气传输光通信系统及其测试，中国激光，2000，A27(11)：1040-1043
5．陆彦文，陆启生著《军用激光技术》，国防工业出版社，1999
6.J. R. Kerr, P. J. Titterton, A. R. Kraemer, C. R. Dooke, Atmospheric optical communications systems, Proceedings of the IEEE, 1970, 58(10): 1691-1709
(a)F. E. Goodwin and I. A. Nussmeier, Optical heterodyne communications experiments at 10.6um microns, IEEE J. Quantum Electron, 1968, QE-4: 612-617
(b)J. H. Ward, A narrow beam broad bandwidth optical communication system, ITT, INC, San Fernando; calif,pep.NAS8-20629,1968
(c)H.W. Mocker, A10.6micron optical heterodyne communication system,Applied Optics, 1969,8:677-684
(d)R.T. Denton and T.S.Kinsdl, Terminals for a high-speed optical pulse code modulation communication system:I.224-Mbit/s single channel,Proc. IEEE, 1968,56:140-145
(e)T.S. Kinsdl and R.T. Denton, Terminals for a high-speed optical pulse code modulation communication system: II.optical multiplexing and demultiplexing ,Proc, IEEE, 1968,56:146-154
7．邹自立，悄然复兴的激光大气通信技术，光通信技术，1997，21(3)：169-170
8.Robert Pease. Optical laser-communications systems carce nichein metro markets. Lightwave, 1999,(9):23-27
9．潘文，胡渝，美国空间激光通信研究发展概况及现状，电子科技大学学报，1998，27(5)：541-544
10.Isaac .I.Kin,Joseph Koontz, Harel Hakakha et al,Measuremem of scintillation and link margin for the TerraLink laser Communicatioo system, SPIE, 1998,3232:100-118
11．尹道素，皮德忠，日本空间光通信技术的发展状况，电子科技大学学报，1998，27(5)：546-550
12．[苏]B.H.塔塔尔斯基著，温景嵩，宋正方等译《湍流大气中波的传播理论》，科学出版社，1978
13.Robert S Lawrence and John W Strohbehn, A survey of clear-air propagation effects relevant to optical communications, Proceedings of the IEEE, 1970,58(10): 1523-1545
14.David R Wosely et al, 4km terrestrial line-of-sight optical free-space link operating at 155Mb/s ,SPIE, 1994,2123:108-117
15.E.Coute de Miranda,D.Luthra and R.S.Cole, Spectral analysis of rainfall induced scintillations on a 4.1km 0.83um line-of-sight link over central London, Electronics Letters, 1995,31(17):1479-1480
16.E Coute de Miranda and R .S.Cole, Statistical snalysis of angle-of-arrival on 4.1km line-of-sight laser link at 0.83um across central London, Electronics Letters, 1996,32(3):237-238
17 Isaac. I. Kim, Eric Woodbridge, Victor Chan et al, Scintillation measurements performed during the limited visibility lasercom experiment, SPIE, 1998, 3266: 209-220
18.Brain R. Strickland, Michael J. Lavan, Eric Woodbridge et al, Effects of fog on the bit-error rate of a free-space laser communication system. Applied Optics, 1999, 38(3): 424-431
19.Muthu Jeganathan and Neema Jalali, Analysis of data from the atmospheric visibility monitoring (AVM)program, SPIE, 3266: 200-208
20．饶中，王世鹏，刘晓春等，激光在湍流大气中的光强起伏与光斑统计特性，量子电子学报，1998，15(2)：155-163
21．饶中，王世鹏，刘晓春，被湍流大气退化的激光光斑：尺度测量与形变特征描述，光学学报，1998，18(4)：450-455
22．王世鹏，饶中，刘晓春，实际大气中激光闪烁效应的实验观测，光电工程，1998，25(6)：120-123
23．饶中，王世鹏，刘晓春等，实际大气中激光闪烁的概率分布，光学学报，1999，19(1)：81-86
24．王世鹏，饶中，刘晓春，实际大气中激光强度起伏的全年统计特征，1999，19(3)：390-396
25．饶中，王世鹏，刘晓春等，湍流大气中激光束漂移的实验研究，中国激光，2000，A27(11)：1011-1015
26.L. S. Rothman. et al, Applied Optics, 1987(26): 4058
27.M. Bertolotti, Effects of atmosphere on the propagation of laser beams, Istitute Superiore P. T-Roma-Italy, p355.
28．宋正方著《应用大气光学基础》，气象出版社，1990，第三章第七节。
29．宋正方等，湍流大气中脉冲编码光通信的误码率，中国光学学会年会，1980。
30.D. L. Fried and R. A. Schmeltzer, The effects of atmospheric scintillation on an optical data channel-laser radar and binary communications, Applied Optics, 1967, 6(10): 1729-1737
31．宋正方著《应用大气光学基础》，气象出版社，1990，第二章第五节。
32．宋正方，激光杂志，1988(9)：1
33.S. T. Shipley et al, J. Applied Meteorol. 1974(13): 800
34．宋正方著《应用大气光学基础》，气象出版社，1990，第三章第六节。
35．吴健，乐时晓著《随机介质中的光传播理论》，成都电讯工程学院出版社，1988：142
36.T. L. Ho. Log-amplitude fluctuations of laser beam in a turbulent atmosphere. Journal of the optical society of America, 1969, 59(4): 385-390
37.James H. Churnside and R. J. Hill. Probability density of irradiance scintillations for strong path integrated refractive turbulence. Journal of the optical society of America, 1987,4(4):727-733
38.James. H. Churnside and Steven F.Clifford. Log-normal Rician probability-density function of optical scintillations in the turbulent atmosphere. Journal of the optical society of America, 1987, 4(10): 1923-1929
39.KAMRAM. Kiasaleh. On the probability density function of signal intensity in free-space optical communications systems impaired by pointing jitter and turbulence. Optical Engineering, 1994, 33(11): 3748-3757.
40．谢雪康，吴健，胡渝，大气闪烁对激光信号监测的影响，电子科技大学学报，1998，27(5)：537-540．
2．卢全文，光通信概述，光通信技术，1997，21(3)：171-179
3．黄怀诚编《激光通信》，国防工业出版社，1976
4．蔡燕民，陈刚，董作人等，155Mbit／s大气传输光通信系统及其测试，中国激光，2000，A27(11)：1040-1043
5．陆彦文，陆启生著《军用激光技术》，国防工业出版社，1999
6.J. R. Kerr, P. J. Titterton, A. R. Kraemer, C. R. Dooke, Atmospheric optical communications systems, Proceedings of the IEEE, 1970, 58(10): 1691-1709
(a)F. E. Goodwin and I. A. Nussmeier, Optical heterodyne communications experiments at 10.6um microns, IEEE J. Quantum Electron, 1968, QE-4: 612-617
(b)J. H. Ward, A narrow beam broad bandwidth optical communication system, ITT, INC, San Fernando; calif,pep.NAS8-20629,1968
(c)H.W. Mocker, A10.6micron optical heterodyne communication system,Applied Optics, 1969,8:677-684
(d)R.T. Denton and T.S.Kinsdl, Terminals for a high-speed optical pulse code modulation communication system:I.224-Mbit/s single channel,Proc. IEEE, 1968,56:140-145
(e)T.S. Kinsdl and R.T. Denton, Terminals for a high-speed optical pulse code modulation communication system: II.optical multiplexing and demultiplexing ,Proc, IEEE, 1968,56:146-154
7．邹自立，悄然复兴的激光大气通信技术，光通信技术，1997，21(3)：169-170
8.Robert Pease. Optical laser-communications systems carce nichein metro markets. Lightwave, 1999,(9):23-27
9．潘文，胡渝，美国空间激光通信研究发展概况及现状，电子科技大学学报，1998，27(5)：541-544
10.Isaac .I.Kin,Joseph Koontz, Harel Hakakha et al,Measuremem of scintillation and link margin for the TerraLink laser Communicatioo system, SPIE, 1998,3232:100-118
11．尹道素，皮德忠，日本空间光通信技术的发展状况，电子科技大学学报，1998，27(5)：546-550
12．[苏]B.H.塔塔尔斯基著，温景嵩，宋正方等译《湍流大气中波的传播理论》，科学出版社，1978
13.Robert S Lawrence and John W Strohbehn, A survey of clear-air propagation effects relevant to optical communications, Proceedings of the IEEE, 1970,58(10): 1523-1545
14.David R Wosely et al, 4km terrestrial line-of-sight optical free-space link operating at 155Mb/s ,SPIE, 1994,2123:108-117
15.E.Coute de Miranda,D.Luthra and R.S.Cole, Spectral analysis of rainfall induced scintillations on a 4.1km 0.83um line-of-sight link over central London, Electronics Letters, 1995,31(17):1479-1480
16.E Coute de Miranda and R .S.Cole, Statistical snalysis of angle-of-arrival on 4.1km line-of-sight laser link at 0.83um across central London, Electronics Letters, 1996,32(3):237-238
17 Isaac. I. Kim, Eric Woodbridge, Victor Chan et al, Scintillation measurements performed during the limited visibility lasercom experiment, SPIE, 1998, 3266: 209-220
18.Brain R. Strickland, Michael J. Lavan, Eric Woodbridge et al, Effects of fog on the bit-error rate of a free-space laser communication system. Applied Optics, 1999, 38(3): 424-431
19.Muthu Jeganathan and Neema Jalali, Analysis of data from the atmospheric visibility monitoring (AVM)program, SPIE, 3266: 200-208
20．饶中，王世鹏，刘晓春等，激光在湍流大气中的光强起伏与光斑统计特性，量子电子学报，1998，15(2)：155-163
21．饶中，王世鹏，刘晓春，被湍流大气退化的激光光斑：尺度测量与形变特征描述，光学学报，1998，18(4)：450-455
22．王世鹏，饶中，刘晓春，实际大气中激光闪烁效应的实验观测，光电工程，1998，25(6)：120-123
23．饶中，王世鹏，刘晓春等，实际大气中激光闪烁的概率分布，光学学报，1999，19(1)：81-86
24．王世鹏，饶中，刘晓春，实际大气中激光强度起伏的全年统计特征，1999，19(3)：390-396
25．饶中，王世鹏，刘晓春等，湍流大气中激光束漂移的实验研究，中国激光，2000，A27(11)：1011-1015
26.L. S. Rothman. et al, Applied Optics, 1987(26): 4058
27.M. Bertolotti, Effects of atmosphere on the propagation of laser beams, Istitute Superiore P. T-Roma-Italy, p355.
28．宋正方著《应用大气光学基础》，气象出版社，1990，第三章第七节。
29．宋正方等，湍流大气中脉冲编码光通信的误码率，中国光学学会年会，1980。
30.D. L. Fried and R. A. Schmeltzer, The effects of atmospheric scintillation on an optical data channel-laser radar and binary communications, Applied Optics, 1967, 6(10): 1729-1737
31．宋正方著《应用大气光学基础》，气象出版社，1990，第二章第五节。
32．宋正方，激光杂志，1988(9)：1
33.S. T. Shipley et al, J. Applied Meteorol. 1974(13): 800
34．宋正方著《应用大气光学基础》，气象出版社，1990，第三章第六节。
35．吴健，乐时晓著《随机介质中的光传播理论》，成都电讯工程学院出版社，1988：142
36.T. L. Ho. Log-amplitude fluctuations of laser beam in a turbulent atmosphere. Journal of the optical society of America, 1969, 59(4): 385-390
37.James H. Churnside and R. J. Hill. Probability density of irradiance scintillations for strong path integrated refractive turbulence. Journal of the optical society of America, 1987,4(4):727-733
38.James. H. Churnside and Steven F.Clifford. Log-normal Rician probability-density function of optical scintillations in the turbulent atmosphere. Journal of the optical society of America, 1987, 4(10): 1923-1929
39.KAMRAM. Kiasaleh. On the probability density function of signal intensity in free-space optical communications systems impaired by pointing jitter and turbulence. Optical Engineering, 1994, 33(11): 3748-3757.
40．谢雪康，吴健，胡渝，大气闪烁对激光信号监测的影响，电子科技大学学报，1998，27(5)：537-540．