利用衍射锥镜降低卫星光通信探测器位置精度要求的方法

针对卫星光通信系统中接收系统对探测器位置的精度要求,提出利用扩大焦深范围的方法降低探测器的轴向位置精度要求.并根据接收光学天线存在中心遮挡的实际情况,采用切趾圆环对数型衍射光锥实现光束强度的轴向均匀分布.利用能量守恒法获得了衍射锥镜的位相分布函数和振幅透过率函数.计算机仿真结果表明,利用该光锥实现光强轴向均匀分布的能力远大于普通透镜,它将有效提升卫星光通信系统捕获、跟踪、通信性能的可靠性.

Method for reducing accuracy requirement of detector position with diffractive axicon in satellite optical communication

Due to the high accuracy of the detector position in receiving system of satellite optical communication, the method expanding the focal depth was put forward to reduce the acquirement of the axial detector position accuracy. According to the central obstacle caused by receiving optical antenna, apodized annular-aperture logarithmic axicon was utilized to achieve uniform distribution of the beam on the optical axis. By means of the geometrical law of energy conservation, the phase distribution function and the intensity transmittance function of the diffractive axicon were obtained. Numerical simulation results show that the capacity which uses apodized annular-aperture logarithmic axicon to achieve uniform distribution of the beam on the optical axis is much larger than that of ordinary lenses', which can enhance the reliability of the acquisition, tracking and communication in satellite optical communication system significantly.