Analysis of the influence of defocus on the field of view of laser communication reception
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摘要: 为了降低自由空间激光通信中对准难度，本文提出了采用离焦的方法以增大接收视场角。以满足通信所需最低能量（-35 dBm）为基准，理论推导了探测器接收能量、接收视场角（FOV）、离焦接收能量及离焦量之间的相互关系，并通过Matlab仿真，分析对比了离焦接收能量和离焦量对接收视场角的影响。结果显示，当离焦量为0.5 mm时，离焦接收能量从-20.9 dBm提高到-4.1 dBm，接收视场角能增大0.27 mrad；当离焦接收能量为-4.1 dBm时，离焦量从0.2 mm扩大到1.0 mm，视场角能增大1.75 mrad。通过对比表明，提高离焦接收能量以及扩大离焦量都可以增加接收视场角，且扩大离焦量的效果相对比较明显，这对后续离焦系统的设计提供了理论指导依据。Abstract: A defocus method is proposed in this paper to increase the receiving field of view and reduce the difficulty of alignment in free space laser communication. Based on the minimum energy required for communication (-35 dBm), the relationship between detector receiving energy, receiving field of view (FOV), defocus receiving energy and defocusing amount is theoretically derived and simulated by Matlab. We analyses and compare the influence of defocused receiving energy and defocusing on the received field of view. The results show that when the defocusing amount is 0.5 mm, the defocus receiving energy is increased from -20.9 dBm to -4.1 dBm, the receiving FOV can be increased by 0.27 mrad. When the defocus receiving energy is -4.1 dBm, the defocus amount is increased from 0.2 mm to 1.0 mm, the FOV will be increased by 1.75 mrad. The comparison shows that increasing the defocus receiving energy and expanding the defocusing amount can increase the receiving field of view, and the effect of expanding the defocusing amount is relatively significant, which provides a theoretical guidance for the design of the subsequent defocusing system.
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Key words:
- laser communication /
- defocus /
- field of view /
- defocus receiving energy
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图 2 不同离焦量和视场下的光斑示意图
Figure 2. Schematic diagram of spot at different defocusing amount and FOV
图 3 光斑与探测器重叠面积示意图
Figure 3. Schematic diagram of overlapping area of spot and detector
图 5 固定视场下的离焦量变化示意图
Figure 5. Schematic diagram of defocusing amount change at fixed FOV
图 6 固定离焦量下的视场变化示意图
Figure 6. Schematic diagram of FOV change at fixed defocusing amount
图 7 光斑完全覆盖探测器面下的探测器接收能量与离焦量的关系图
Figure 7. Relation diagram of energy received by detector and defocusing amount under the condition of detector completely covered by the spot
图 8 固定重叠面积下的最大视场示意图
Figure 8. Schematic diagram of maximum FOV at fixed overlapping area
图 9 不同视场下的探测器接收能量与离焦量的关系曲线
Figure 9. Relation curves of energy received by detector and defocusing amount at different FOVs
图 10 不同离焦接收能量下探测器接收能量与视场角的关系曲线
Figure 10. Relation curves of energy received by detector and FOV at different defocus receiving energy
图 12 不同离焦量下探测器接收能量与视场角的关系曲线图
Figure 12. Relation curves of energy received by detector and FOV at different defocusing amount
表 1 链路计算输入参数
Table 1. Input parameters of link calculation
Parameter/unit Value Pt/dBm 20 Dr/mm 20 D/mm 50 f/mm 150 ω/μrad 400 γt /dBm 1.87 γr/dBm 0.97 γf/dBm 1.55 γa/(dBm·km-1) 1.6 
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表 2 不同通信距离下的离焦接收能量
Table 2. Defocus receiving energy at different communication distances
Parameter/unit Value L/km 1 2 3 4 Pr/dBm -4.1 -11.7 -16.8 -20.9
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表 3 离焦与非离焦接收视场对比
Table 3. Contrast of FOV under the conditions of defocus and non-defocus
Image 2θ/mrad Δx/mm PAPD/dBm defocus 1 0.266 -35 1.5 0.495 -35 2 0.723 -35 2.5 0.952 -35 non-defocus 0.417 0 -35
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[1] 王红星, 宋博, 吴晓军, 等.指向误差对海上无线光通信误码率性能的影响分析[J].光学学报, 2016, 36(9):9-18. http://www.cnki.com.cn/Article/CJFDTOTAL-GXXB201609001.htmWANG H X, SONG B, WU X J, et al.. Influence of pointing error on bit error rate of free space optics system at sea[J]. Acta Optica Sinica, 2016, 36(9):9-18.(in Chinese) http://www.cnki.com.cn/Article/CJFDTOTAL-GXXB201609001.htm [2] FAN Y, CHENG J L, THEODOROS A T. Free-space optical communications with generalized pointing errors[J]. IEEE Optical Networks and Systems, 2013:3943-3947. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6655174 [3] FAN Y, CHENG J L, THEODOROS A T. Free-space optical communication with nonzero boresight pointing errors[J]. IEEE Transactions on Communications, 62(2):713-725. doi: 10.1109/TCOMM.2014.010914.130249 [4] 李俊山, 杨亚威, 朱子江, 等.非凸性优化与动态自适应滤波的湍流退化视频复原[J].液晶与显示, 2017, 32(6):482-490. http://d.old.wanfangdata.com.cn/Periodical/yjyxs201706010LI J SH, YANG Y W, ZHU Z J, et al.. Turbulence-degraded video restoration based on non-convexity optimization and dynamical adaptive filtering[J]. Chinese Journal of Liquid Crystals and Displays, 2017, 32(6):482-490.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yjyxs201706010 [5] 胡立发, 彭增辉, 王启东, 等.纯位相液晶调制器的响应特性计算[J].液晶与显示, 2017, 32(3):182-189. http://d.old.wanfangdata.com.cn/Periodical/yjyxs201703004HU L F, PENG Z H, WANG Q D, et al.. Calculation of electro-optical characteristics of phase-only liquid crystal modulator[J]. Chinese Journal of Liquid Crystals and Displays, 2017, 32(3):182-189.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yjyxs201703004 [6] 马东堂.大气激光通信中的多光束发射和接收技术研究[D].长沙: 国防科学技术大学, 2004. http://cdmd.cnki.com.cn/article/cdmd-90002-2005144407.htmMA D T. Study on multiple-beam transmission and reception technique for atmospheric laser communication[D]. Changsha: National University of Defense Technology, 2004.(in Chinese) http://cdmd.cnki.com.cn/article/cdmd-90002-2005144407.htm [7] 高洁.车地无线通信系统的光学特性研究[D].无锡: 江南大学, 2016. http://cdmd.cnki.com.cn/Article/CDMD-10295-1016029889.htmGAO J. Reaserch on the optical properties of the ground-to-train wireless communication system[D]. Wuxi: Jiangnan University, 2016(in Chinese) http://cdmd.cnki.com.cn/Article/CDMD-10295-1016029889.htm [8] 张亚非.自由空间MIMO无线光通信系统研究[D].哈尔滨: 哈尔滨工业大学, 2013. http://cdmd.cnki.com.cn/Article/CDMD-10213-1014001410.htmZHANG Y F. Reasearch on MIMO optical wireless communication system in free space[D]. Harbin: Harbin Institute of Technology, 2013.(in Chinese) http://cdmd.cnki.com.cn/Article/CDMD-10213-1014001410.htm [9] WANG J M, ZHOU Y, BAI R M, et al.. Point-ahead angle and co-alignment error measurement method for free-space optical communication systems[J]. Journal of Lightwave Technology, DOI10.1109/JLT.2017.2718578. http://ieeexplore.ieee.org/document/7954942/ [10] 张伟, 张合, 张祥金.小型大瞬时视场光学探测系统优化设计[J].红外与激光工程, 2016, 45(5):145-151. http://d.old.wanfangdata.com.cn/Periodical/hwyjggc201605024ZHANG W, ZHANG H, ZHANG X J. Optimization design of small optical detection system with large instantaneous field of view[J]. Infrared and Laser Engineering, 2016, 45(5):145-151.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/hwyjggc201605024 [11] 刘智颖, 邢天祥.激光半主动导引头光学系统设计[J].激光与红外, 2016, 46(5):527-531. doi: 10.3969/j.issn.1001-5078.2016.05.003LIU ZH Y, XING T X. Optical system design for laser semi-active guided seeker[J]. Laser and Infrared, 2016, 46(5):527-531.(in Chinese) doi: 10.3969/j.issn.1001-5078.2016.05.003 [12] 胡博, 常伟军, 孙婷, 等.激光半主动制导导引头光学系统的设计[J].应用光学, 2012, 33(2):402-405. http://d.old.wanfangdata.com.cn/Periodical/yygx201202032HU B, CHANG W J, SUN T, et al.. Laser semi-active seeking guided seeker optical system[J]. Journal of Applied Optics, 2012, 33(2):402-405.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yygx201202032 [13] 陆红强, 赵卫, 胡辉, 等.光斑偏移对空间激光通信系统性能的影响[J].强激光与粒子束, 2011, 23(4):895-900. http://d.old.wanfangdata.com.cn/Periodical/qjgylzs201104010LU H Q, ZHAO W, HU H, et al.. Effects of beam misalignment on space laser communication systems[J]. High Power Laser and Particle Beams, 2011, 23(4):895-900.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/qjgylzs201104010 [14] 赵海涛, 王振华, 韦承甫, 等.基于光学调制的离焦探测技术[J].强激光与粒子束, 2010, 22(8):1839-1842. http://d.old.wanfangdata.com.cn/Periodical/qjgylzs201008031ZHAO H T, WANG ZH H, WEI CH F, et al.. Detection of defocus length based on optical modulator[J]. High Power Laser and Particle Beams, 2010, 22(8):1839-1842.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/qjgylzs201008031 [15] 原育凯, 程仕东, 裴云天.光学系统离焦对自动调焦评价函数的影响[J].光电工程, 2005(12):51-54+58. doi: 10.3969/j.issn.1003-501X.2005.12.013YUAN Y K, CHENG SH D, PEI Y T. Influence of defocus on automatic focusing evaluatin function[J]. Opto-Electronic Engineering, 2005(12):51-54+58.(in Chinese) doi: 10.3969/j.issn.1003-501X.2005.12.013 [16] 王珺楠, 邱欢, 张丽娟, 等.基于小波域Curvelet变换的湍流图像去噪算法[J].液晶与显示, 2017, 32(11):905-913. http://d.old.wanfangdata.com.cn/Periodical/yjyxs201711008WANG J N, QIU H, ZHANG L J, et al.. Atmospheric turbulence image denoising algorithm based on wavelet-domain curvelet transform[J]. Chinese Journal of Liquid Crystals and Displays, 2017, 32(11):905-913.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yjyxs201711008 [17] 张亚超, 胡立发, 彭增辉, 等.液晶波前校正器过驱动矩阵的测量方法研究[J].液晶与显示, 2014, 29(5):709-715. http://d.old.wanfangdata.com.cn/Periodical/yjyxs201405011ZHANG Y CH, HU L F, PENG Z H, et al.. Method for characterizing the overdrive-matrix of a liquid crystal wavefront corrector[J]. Chinese Journal of Liquid Crystals and Displays, 2014, 29(5):709-715.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yjyxs201405011 [18] 王灿进, 石宁宁, 孙涛.同态非局部滤波在激光主动成像散斑抑制中的应用研究[J].液晶与显示, 2016, 31(2):193-200. http://d.old.wanfangdata.com.cn/Periodical/yjyxs201602011WANG S J, SHI N N, SUN T. Application of homomorphic non-local filters in speckle noise suppression for laser active imaging[J]. Chinese Journal of Liquid Crystals and Displays, 2016, 31(2):193-200.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yjyxs201602011 [19] 王玉坤, 贾娜, 张锐.激光通信成像光斑处理方法研究[J].液晶与显示, 2017, 32(9):736-740. http://d.old.wanfangdata.com.cn/Periodical/yjyxs201709010WANG Y K, JIA N, ZHANG R. Laser communication spots imaging process method[J]. Chinese Journal of Liquid Crystals and Displays, 2017, 32(9):736-740.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/yjyxs201709010 [20] 姜会林.空间激光通信技术与系统[M].北京:国防工业出版社, 2010.JIANG H L. The Technologies and System of Space Laser Communication[M]. Beijing:National Defense Idustry Press, 2010.(in Chinese) -
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