星地激光通信中接收光信号的仿真方法

星地激光通信中, 由于大气湍流等影响, 接收光信号将出现包络起伏现象, 严重时将引起接收系统突发误码。为研究其中突发误码的发生规律及其对通信有效性的影响, 对接收光信号包络起伏的仿真方法进行了研究。针对常规的仿真方法在计算量、资源消耗、仿真时间长度等方面存在的诸多弱点, 提出了一种使用Gauss随机过程的幂级数拟合接收光信号幅度的仿真方法, 该方法利用接收光信号均值、方差、偏态系数和峰度系数计算各阶系数, 最高取到3次方项, 并使用FFT/IFFT实现时间功率谱特征拟合。仿真结果证明了该仿真方法的合理性。

Simulation Method of Receiving Signal in Satellite-Ground Laser Communication

In satellite-ground laser communication system, atmospheric turbulence causes the fluctuation of the receiving optical signal, which can arouse burst bit error while in bad situation In order to study the characteristic and influence of the burst bit error, a new simulation method of fluctuated receiving signal simulation was studied in this paper, which uses the power series of Gaussian process to fit the target process The highest power order of Gaussian process was set to 3, and the factor of power series was obtained from the statistic character (mean, quadratic mean deviation, skewness and kurtosis) of the envelope fluctuation of the receiving optical signal, and the power spectra density of the fluctuation was fit by FFT /IFFT. This method takes advantages in computational complexity and resource consumption.