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空间光通信以大气为介质进行信息传输时,不可避免地受到大气散射、大气湍流及背景光等因素的影响。针对大气信道对通信质量的影响,提出了基于激光偏振态参数的调制与解调技术,设计了一种基于偏振移位键控(PolSK)的大气激光通信系统并对其原理进行了简要分析。该通信系统采用偏振移位键控的调制方式,即利用圆偏振光的两种旋态(左旋和右旋)进行编码、调制从而实现数据的传输,接收端采用平衡探测方法进行光信号解调。对系统性能进行仿真分析,结果表明,基于激光偏振态参数的调制与解调技术在抗大气环境干扰、提高数据传输速率和降低误码率等方面具有优越性,在未来的空间激光通信领域有广阔的发展空间和应用前景。
Spatial optical communication to the atmosphere as the media for information transmission, inevitably by atmospheric scattering, atmospheric turbulence and background light and other factors. Aiming at the influence of atmospheric channel on the communication quality, a modulation and demodulation technique based on laser polarization parameters is proposed. An atmospheric laser communication system based on Polarization Shift Keying (PolSK) is designed and its principle is briefly analyzed. The communication system adopts the modulation method of polarization shift keying, that is, the encoding and the modulation are performed by using two kinds of rotary (left-handed and right-handed) circularly polarized lights for data transmission, and the receiving end adopts the balanced detection method to demodulate the optical signal . The simulation results show that the modulation and demodulation technology based on the laser polarization parameters is superior in resisting atmospheric environment interference, increasing the data transmission rate and reducing the bit error rate. In the field of space laser communication in the future Broad space for development and application prospects.