星地下行链路中多孔径相干光接收机性能分析 
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Performance Analysis of Multi-Aperture Coherent Optical Receiver for Satellite-to-Ground Downlink
1 贵州大学物理学院, 贵州 贵阳 550025
2 华中科技大学光学与电子信息学院, 湖北 武汉 430074
图 & 表
图 1. 下行链路自由空间光(FSO)通信多孔径相干光接收机结构图
Fig. 1. Structure diagram of multi-aperture coherent optical receiver for downlink free space optical (FSO)communication
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图 2. 弱湍流晴空条件下,EGC相干点接收机模型下平均接收功率与BER的关系
Fig. 2. Relationship between average received power and BER for EGC coherent point receiver model under clean air condition in weak turbulence
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图 3. 强湍流晴空条件下,EGC相干点接收机模型下平均接收功率与BER的关系
Fig. 3. Relationship between average received power and BER for EGC coherent point receiver modelunder clean air condition in strong turbulence
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图 4. 接收天线直径D与Rytov方差σR2的关系
Fig. 4. Relationship between receiving antenna diameter D and Rytov variance σR2
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图 5. 弱湍流下,单个直径为D的L路EGC相干光接收机模型下平均接收功率与BER的关系。(a)晴空;(b)轻雾;(c)中雾;(d)大雾;(e)浓雾
Fig. 5. Relationship between average received power and BER for L-channel EGC coherent optical receiver model with diameter of D under different fog conditions in weak turbulence. (a) Clean air; (b) light fog; (c) moderate fog; (d) thick fog; (e) dense fog
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图 6. 强湍流下,单个直径为D的L路EGC相干光接收机模型下平均接收功率与BER的关系。(a)晴空;(b)轻雾;(c)中雾;(d)大雾;(e)浓雾
Fig. 6. Relationship between average received power and BER for L-channel with EGC coherent optical receiver model with diameter of D under different fog conditions in strong turbulence. (a) Clean air; (b) light fog; (c) moderate fog; (d) thick fog; (e) dense fog
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表 11550 nm波长下的气象条件参数
Table1. Weather condition parameters for 1550-nm wavelength signal
| Type of fog | Visibility /m | Transmittance hl |
|---|
| Light fog | 1000 | 0.94 | | Moderate fog | 500 | 0.85 | | Thick fog | 250 | 0.67 | | Dense fog | 70 | 0.36 |
|
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表 2星地下行链路仿真参数
Table2. Simulation parameters of satellite-to-ground downlink
| Parameter | Value |
|---|
| Height from receiver to ground h0 m | 0 | | Satellite altitude H/km | 38000 | | Wavelength λ/nm | 1550 | | Wind velocity ω/(m·s-1) | 21 | | Refractive index parameter A0/(10-14m-2/3) | 1.7 | | Zenith angle ζ | 0-π/2 |
|
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表 3在弱湍流和强湍流晴空条件下,采用相干点接收机模型计算得到的灵敏度(BER为10-6)
Table3. Sensitivity for coherent point receiver model under clean air condition in weak turbulence and strong turbulence (BER is 10-6)
| Turbulence condition | Average received power /dBm |
|---|
| L=1, Aperturearea of A | L=2, Aperturearea of A/2 | L=3, Aperturearea of A/3 | L=4, Aperturearea of A/4 |
|---|
| Weak turbulence | -45.60 | -46.89(1.29) | -47.41(1.81) | -47.52(1.92) | | Strong turbulence | -26.85 | -37.64(10.79) | -41.13(14.28) | -42.72(15.87) |
|
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表 4在弱湍流和强湍流不同气象条件下,单个直径为D的L路相干光接收机模型计算得到的灵敏度(BER为10-6)
Table4. Sensitivity for L-channel coherent optical receiver model with diameter of D under different fog conditions in weak turbulence and strong turbulence (BER is 10-6)
| Turbulencecondition | Weathercondition | Sensitivity /dBm |
|---|
| L=1, D=12 cm | L=2, D=6 cm | L=3, D=4 cm | L=4, D=6 cm |
|---|
| Weakturbulence | Clear air | -47.25 | -50.60(3.35) | -52.45(5.20) | -53.87(6.62) | | Light fog | -46.96 | -50.35(3.39) | -52.29(5.33) | -53.58(6.62) | | Moderate fog | -46.57 | -49.89(3.32) | -51.80(5.23) | -53.19(6.62) | | Thick fog | -45.54 | -48.88(3.34) | -50.77(5.23) | -52.13(6.59) | | Dense fog | -42.82 | -46.21(3.39) | -48.07(5.25) | -49.43(6.61) | | Strongturbulence | Clear air | -32.54 | -42.52(9.98) | -46.86(14.32) | -49.39(16.85) | | Light fog | -32.27 | -42.24(9.97) | -46.61(14.34) | -49.12(16.85) | | Moderate fog | -31.83 | -41.79(9.96) | -46.17(14.34) | -48.69(16.86) | | Thick fog | -30.80 | -40.76(9.96) | -45.13(14.33) | -47.65(16.85) | | Dense fog | -28.10 | -38.08(9.98) | -42.43(14.33) | -44.95(16.85) |
|
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张晓玉, 崔晟, 刘德明, 江阳. 星地下行链路中多孔径相干光接收机性能分析[J]. 激光与光电子学进展, 2019, 56(21): 210101. Xiaoyu Zhang, Sheng Cui, Deming Liu, Yang Jiang. Performance Analysis of Multi-Aperture Coherent Optical Receiver for Satellite-to-Ground Downlink[J]. Laser & Optoelectronics Progress, 2019, 56(21): 210101.
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