Optical PPM time slot synchronization method under atmospheric turbulence fading channel

The invention relates to an optical PPM time slot synchronization method under an atmospheric turbulence fading channel, and belongs to the technical field of communication. In order to improve the tracking synchronization performance of the early-late gate, the invention provides a scheme for weighting the timing error estimation value of the early-late gate according to the ratio of the average information photon number to the background photon number of the current PPM symbol. And estimating the initial phase position of the early-late gate through the photon pulse peak position. And finally, aiming at the problem that the early-late gate needs to be recaptured when the signal is interrupted and recovered, proposing that a timing error before interruption is used as a timing error estimated value after recovery, and performing simulation analysis and experimental data verification. 本发明涉及一种大气湍流衰落信道下光PPM时隙同步方法，属于通信技术领域。本发明为提升早迟门跟踪同步性能，提出以当前PPM符号的平均信息光子数和背景光子数的比值对早迟门的定时误差估计值加权方案。接着通过光子脉冲峰值位置估计早迟门初始相位位置。最后针对信号