论文部分内容阅读
发射机及接收机的对准误差都会引起前置光放大卫星激光通信系统信号的衰落,在同时考虑发射机、接收机对准误差的条件下优化系统性能非常重要。将接收机对准误差引起的空间光耦合损耗用一个高斯函数近似,并同时考虑发射机对准误差引起的对准损耗,推导出了接收光功率概率密度的近似解析表达式,应用该概率密度函数,建立了基于平均误码率原则的前置光放大卫星激光通信系统的优化模型。仿真结果表明,在给定平均误码率要求及对准误差一定时,存在一个最佳发射光束宽度、接收天线直径及空间光耦合参数,使所需的发射功率最小,采用更大的接收天线并不能降低对发射功率的要求。
Alignment errors between the transmitter and the receiver can cause the signal degradation of the pre-optical amplifier satellite laser communication system. It is very important to optimize the system performance while taking into account the transmitter and receiver alignment errors. The spatial optical coupling loss caused by the receiver alignment error is approximated by a Gaussian function, and the alignment loss caused by the transmitter alignment error is taken into account. The approximate analytic expression of the probability density of the received optical power is deduced. Using this probability density Function, an optimization model of pre-optical amplification satellite laser communication system based on the principle of average bit error rate is established. The simulation results show that there is an optimal transmit beam width, receive antenna diameter and spatial optical coupling parameters for a given average bit error rate (BER) and alignment error, so that the required transmit power is minimized and a larger receive antenna It does not reduce the transmit power requirements.