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.
作者
刘航
卢麟
朱勇
吴传信
张宝富
Liu Hang;Lu Lin;Zhu Yong;Wu Chuanxin;Zhang Baofu(Institute of Communication Engineering, Army Engineering University,Nanjing, Jiangsu 210007, China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2019年第4期176-182,共7页
Acta Optica Sinica
基金
国家自然科学基金(61673393
61371121
61475193)
关键词
大气光学
空间激光授时
大气湍流
光强闪烁
脉冲到达时刻抖动
atmospheric optics
time transfer by space laser link
atmospheric turbulence
intensity scintillation
pulse arrival time jitter
