传统磁光调制方位传递技术要求光束直线传播,存在应用范围受限的问题。针对该问题,提出一种基于保偏光纤的非通视方位传递技术。首先给出了系统组成,阐述了系统工作原理;然后重点分析了保偏光纤双折射效应对传输光矢量的相位差的影响,构建了包含相位差信息的保偏光纤琼斯矩阵;最后利用琼斯矩阵对光矢量的麦克斯韦列进行了变换,推导了系统方位角解算模型,并进行仿真分析。结果表明:当相位差不为π/2时,方位理论解算误差在0.1″以内;当相位差为π/2时,解算方位角始终为0,误差随方位角的增加呈比例增长。结论说明该技术应用于方位传递的可行性。所提方法拓展了方位传递方式,对基于保偏光纤的非通视方位传递技术的改进和系统测量精度的提高具有重要意义。

The traditional azimuth transmission technology based on magneto-optical modulation requires linear propagation of a beam and has a limited application scope. To solve this problem, a non-line-of-sight azimuth transmission technology is proposed based on polarization-maintaining fiber. First, the compositions of the system are introduced and the working principle of the system is presented. Then, by analyzing the effect of birefringence effect of a polarization-maintaining fiber on the phase difference of the transmission vector, a polarization-maintaining fiber Jones matrix containing phase difference is constructed. Finally, the Jones matrix is used to transform the Maxwell columns of the light vector, the azimuth solving model is derived, and the simulation analysis is carried out. The results show that the theoretical error of misaligned azimuth can be controlled within 0.1″ when the phase difference is not equal to π/2. In contrast, when the phase difference is π/2, the azimuth is always 0, and the error increases proportionally with the azimuth. The conclusion shows that the feasibility of this technique in azimuth transmission is confirmed. The proposed method extends the azimuth transmission mode and is of great significance to both the improvement of the non-line-of-sight azimuth transmission technology based on polarization-maintaining fiber and the improvement of the measurement accuracy of the system.