大气衰减信道光通信系统传输误码率研究

Study on the transmission error rate of laser communication system in atmospheric attenuation channel

为了解决激光雷达通讯系统噪声干扰影响系统性能的问题,研究了激光在大气衰减信道传输的信噪比和误码率。根据大气吸收散射特性,给出了主导因素气溶胶的大气衰减系数,从激光雷达传输系统的光电信号转换关系,给出了只考虑大气衰减影响的探测器输出信噪比以及误码率数学模型。通过计算与实验分析,结果表明不同能见度条件下,误码率性能随接收器的接收孔径变化趋势存在一定的差异,误码率与能见度值成反比关系。为了明显改善误码率,达到更好的通信系统性能,需要对接收器的接收孔径进行设计研究,该模型可有效评估大气衰减条件下激光雷达系统误码率性能,并为相关理论研究提供参考。

In order to solve the problem of the system performance caused by the noise interference of radar communication system, this paper studies the signal-to-noise ratio and BER of laser propagation in the atmospheric attenuation channel. According to the characteristics of atmospheric absorption and scattering, the atmospheric attenuation coefficient of the dominant factor aerosol is given, and the signal to noise ratio and the BER mathematical model of the detector are given considering the effect of atmospheric attenuation from the optical signal conversion of the laser transmission system. Through calculation and experimental analysis, the results show that the BER performance varies with the receiver aperture in different visibility conditions, and the BER is inversely proportional to the visibility value. In order to improve the BER and achieve better performance of the communication system, it is necessary to design and study the receiver aperture, the research model can effectively evaluate the BER performance of laser system under the condition of atmospheric attenuation, and provide reference for relevant theoretical research.