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为了降低大气湍流和通信终端相对运动对通信系统性能造成的影响,对采用了圆偏振调制原理的通信系统进行了研究。激光的圆偏振特性在大气传输中变化很小,且圆偏振光具有旋转对称性,系统的性能不受两通信终端相对运动的影响,降低了技术的实现难度,具有很高的可靠性,特别适用于移动通信终端。介绍了两种圆偏振调制方式,推导了线偏振态与圆偏振态之间的转换过程,为圆偏振编码解码提供理论基础。针对这两种调制方式,提出了具体的实现方案,并设计出了圆偏振调制激光通信系统,在该系统中可验证两种编码方式,且结构简单、实现方便,可作为星载通信终端。并进行了简单的圆偏振编码通信实验,实现了数据发射和接收,证明了圆偏振调制的可行性。
In order to reduce the influence of atmospheric turbulence and the relative movement of communication terminal on the communication system performance, the communication system adopting the principle of circular polarization modulation has been studied. The circular polarization of the laser has little change in the atmospheric transmission, and the circularly polarized light has the rotational symmetry. The performance of the system is not influenced by the relative movement of the two communication terminals, which reduces the technical difficulty and has high reliability. In particular, Suitable for mobile communication terminal. Two kinds of circular polarization modulation methods are introduced, the conversion process between the linear polarization state and the circular polarization state is derived, which provides the theoretical basis for circular polarization codec. Aiming at these two modulation methods, a specific implementation scheme is proposed and a circular polarization modulation laser communication system is designed. Two encoding modes can be verified in the system, and the structure is simple and convenient, and can be used as an on-board communication terminal. And a simple circular polarization coding communication experiment was carried out to achieve data transmission and reception, and proved the feasibility of circular polarization modulation.