光强闪烁对空间激光授时抖动的影响
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摘要
基于多相位屏原理并利用功率谱反演法,建立了光强闪烁对脉冲到达时刻抖动的影响模型,仿真研究了不同接收孔径和不同传输距离条件下脉冲到达时刻抖动的变化规律。仿真结果表明:在孔径接收条件下,脉冲到达时刻抖动呈正偏态分布;采用大孔径接收天线可有效抑制脉冲到达时刻的抖动;与近地端相比,传输距离的变化对远地端脉冲到达时刻抖动的影响较小。搭建了大气湍流引起的脉冲到达时刻抖动的实验平台,采集了经过湍流信道传播的秒脉冲波形,利用门限检测法确定了脉冲到达时刻。实验结果表明,脉冲到达时刻抖动分布与理论分析结果相符。
The model for simulating the influence of intensity scintillation on pulse arrival time jitter is established based on the principle of multiple phase screens and the power spectral inversion method. The pulse arrival time jitter is simulated under different receiving apertures and different transmission distances. The simulation results show that the pulse arrival time jitter shows a positively skewed distribution under the condition of aperture receiving. A large receiving aperture can effectively suppress the pulse arrival time jitter. The variation of transmission distance has less influence on the pulse arrival time jitter at the far end compared with at the near end. An experimental platform for the pulse arrival time jitter caused by atmospheric turbulence is established, the second pulse waveform propagating through a turbulence channel is collected, and the pulse arrival time is determined by threshold detection. The experimental results show that the distribution of pulse arrival time jitter is consistent with the theoretical analysis results.
The model for simulating the influence of intensity scintillation on pulse arrival time jitter is established based on the principle of multiple phase screens and the power spectral inversion method. The pulse arrival time jitter is simulated under different receiving apertures and different transmission distances. The simulation results show that the pulse arrival time jitter shows a positively skewed distribution under the condition of aperture receiving. A large receiving aperture can effectively suppress the pulse arrival time jitter. The variation of transmission distance has less influence on the pulse arrival time jitter at the far end compared with at the near end. An experimental platform for the pulse arrival time jitter caused by atmospheric turbulence is established, the second pulse waveform propagating through a turbulence channel is collected, and the pulse arrival time is determined by threshold detection. The experimental results show that the distribution of pulse arrival time jitter is consistent with the theoretical analysis results.
引文
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[3] Djerroud K,Acef O,Clairon A,et al.Coherent optical link through the turbulent atmosphere[J].Optics Letters,2010,35(9):1479-1481.
[4] Belmonte A,Taylor M T,Hollberg L,et al.Effect of atmospheric anisoplanatism on earth-to-satellite time transfer over laser communication links[J].Optics Express,2017,25(14):15676-15686.
[5] Robert C,Conan J M,Wolf P.Impact of turbulence on high-precision ground-satellite frequency transfer with two-way coherent optical links[J].Physical Review A,2016,93(3):033860.
[6] Andrews L C,Phillips R L.Laser beam propagation through random media[M].Bellingham:SPIE Press,2005.
[7] Ma J,Tan L Y,Yu S Y.Satellite optical communication[M].Beijing:National Defense Industry Press,2015:151-154.马晶,谭立英,于思源.卫星光通信[M].北京:国防工业出版社,2015:151-154.
[8] Li Y J,Zhu W Y,Rao R Z.Simulation of random phase screen of non-Kolmogorov atmospheric turbulence[J].Infrared and Laser Engineering,2016,45(12):1211001.李玉杰,朱文越,饶瑞中.非Kolmogorov大气湍流随机相位屏模拟[J].红外与激光工程,2016,45(12):1211001.
[9] Cai D M,Wang K,Jia P,et al.Sampling methods of power spectral density method simulating atmospheric turbulence phase screen[J].Acta Physica Sinica,2014,63(10):104217.蔡冬梅,王昆,贾鹏,等.功率谱反演大气湍流随机相位屏采样方法的研究[J].物理学报,2014,63(10):104217.
[10] Frehlich R.Simulation of laser propagation in a turbulent atmosphere[J].Applied Optics,2000,39(3):393-397.
[11] Yang T X,Zhao S M.Randomphase screen model of ocean turbulence[J].Acta Optica Sinica,2017,37(12):1201001.杨天星,赵生妹.海洋湍流随机相位屏模型[J].光学学报,2017,37(12):1201001.
[12] Xiang J S,Li X S,Chen S J,et al.Time-domain simulation of satellite-terrestrial laser transmission under atmospheric turbulence[J].Laser & Infrared,2014,44(5):487-490.向劲松,李晓双,陈绍娟,等.星-地激光大气湍流传输的时域特性模拟[J].激光与红外,2014,44(5):487-490.
[13] Qian X M,Zhu W Y,Rao R Z.Phase screen distribution for simulating laser propagation along an inhomogeneous atmospheric path[J].Acta Physica Sinica,2009,58(9):6633-6639.钱仙妹,朱文越,饶瑞中.非均匀湍流路径上光传播数值模拟的相位屏分布[J].物理学报,2009,58(9):6633-6639.
[14] Schmidt J D.Numerical simulation of optical wave propagation with examples in MATLAB[M].Bellingham:SPIE Press,2010.
[15] Coles W A,Filice J P,Frehlich R G,et al.Simulation of wave propagation in three-dimensional random media[J].Applied Optics,1995,34(12):2089-2101.
[16] Wei P F,Lin X Y,Lin X D,et al.Temporal simulation of atmospheric turbulence during adaptive optics system testing[J].Chinese Optics,2013,6(3):371-377.卫沛锋,刘欣悦,林旭东,等.自适应光学系统测试中大气湍流的时域模拟[J].中国光学,2013,6(3):371-377.
[17] Chen C Y,Yang H M,Jiang Z G.Optical transmission modeling and computer simulation[M].Beijing:National Defense Industry Press,2016:153.陈纯毅,杨华民,蒋振刚.光传输建模与计算机模拟[M].北京:国防工业出版社,2016:153.