涡旋电磁波的大气湍流相位畸变校正方法

自由空间传输的涡旋电磁波不可避免地受到大气湍流的干扰,使其螺旋相位发生畸变。为了对抗大气湍流的影响,可以使用相位恢复算法进行校正。文中提出一种改进的Gerchberg-Saxton(GS)相位恢复算法,通过引入优化方向因子,有效地克服了传统GS 相位恢复算法陷入局部极小值的困境。随机相位屏的模拟实验结果显示,改进的GS相位恢复算法具有更好的校正效果,根据相对均方根误差评估指标,改进的GS相位恢复算法比传统GS算法改善了35.09%,相比未使用相位恢复算法则改善了64.72%。

Method for Correcting Atmospheric Turbulence Phase Distortion of Vortex Electromagnetic Wave

The vortex electromagnetic waves transmitted in free space are inevitably disturbed by atmospheric turbulence, causing the spiral phase to be distorted. To combat the effects of atmospheric turbulence, a phase recovery algorithm can be used for correction. This paper proposes an improved Gerchberg-Saxton (GS) phase recovery algorithm, which effectively overcomes the dilemma of the traditional GS phase recovery algorithm falling into local minimum value by introducing the optimized directional factor. The simulation results of the random phase screen show that the improved GS phase recovery algorithm has better correction performance. According to the relative root mean square error evaluation index, the improved GS phase recovery algorithm is improved by 35.09% compared with the traditional GS algorithm, and is improved by 64.72% compared with the disturbance phase.