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使用Monte-Carlo仿真方法,基于光强闪烁和光束漂移的联合模型,对使用脉冲编码调制方式(PPM)和雪崩光电二极管(APD)探测器直接探测接收的深空上行激光通信链路的信道容量进行了分析。仿真结果表明,与下行链路中信道容量随着束散角的增加而单调下降的现象不同,对于存在光束漂移作用的上行星地激光链路,存在一个最优发射束散角使得星地激光系统的信道容量最大。在此基础上,对最优束散角与发射光束数目、方位角、热噪声和发射端的光束半径之间的关系进行了分析。所得的结果可以帮助实现星地激光通信系统上行链路的优化设计。
Monte-Carlo simulation method is used to directly detect the channel capacity of the received deep-space uplink laser communication link based on the joint model of light intensity flicker and beam drift using pulse code modulation (PPM) and avalanche photodiode (APD) detectors Analyzed. The simulation results show that the capacity of the downlink is monotonically decreasing with the increase of the beam divergence angle. For the upper-ground laser link with beam drift, there is an optimal beam divergence so that the star-ground laser The system has the largest channel capacity. On this basis, the relationship between the optimum beam divergence angle and the number of emitted beams, azimuth angle, thermal noise and the beam radius at the transmitting end is analyzed. The results obtained can help to achieve the optimal design of the uplink of the satellite laser communication system.