猫眼逆向调制通信链路信噪比分析

Analysis of signal-to-noise ratio of communication link based on cat′s eye modulating retro-reflector

猫眼逆向调制激光通信比其他逆向调制通信方式的通信速率更快,其原因是通信链路逆向调制端的猫眼结构可以实现匹配尺寸更小的调制器。本文在柯林斯衍射积分公式的基础上得到经过大气衰减作用的猫眼激光回波接收功率,并进一步结合光电探测器噪声和大气湍流引起的闪烁效应,仿真分析了通信距离、湍流强度、激光波长、入射角度、猫眼孔径和接收口径对接收端信号信噪比的影响。

Laser communication based on cat′s eye modulating retro-reflector has a faster communication rate than other retro-reflected modulation communication,because the cat′s eye structure can achieve a smaller matching modulator.Based on the Collins diffraction integral formula,the cat′s eye laser echo receiving power through atmospheric attenuation is obtained.Furthermore,combined with the photodetector noise and atmospheric turbulence,the effects of communication distance,turbulence intensity,laser wavelength,incident angle,cat′s eye aperture and receiving aperture on the signal-to-noise ratio of the receiving end are simulated.