【摘要】 研究信号光束偏移对天地一体化信息网络中卫星混沌激光安全通信系统性能的影响,推导由信号光束偏移引起的外失配与内失配影响的系统误码率模型。基于此误码率模型进行数值仿真,研究信号光束偏移如何引起内外失配进而影响系统误码率性能。研究结果表明,光束漂移会在指向误差基础上进一步增大外失配与内失配,从而影响系统性能。当指向误差较小时,优化光束漂移对系统性能提升更大;当指向误差较大时,优化内失配对系统性能提升更大。研究结果对卫星混沌激光安全通信系统的实际工程设计具有重要参考意义,并为将地面高速混沌激光安全技术推广到天地一体化领域奠定基础。更多还原

【Abstract】 The effect of beam center shift on the performance of satellite chaos laser safety communication system in spaceintegrated-ground information network was studied, the bit error rate(BER) formulae with external and internal mismatch caused by beam center shift was conducted. Based on the BER formulae, the effect of beam center shift on external and internal mismatch and system performance was analyzed. The results show that beam wander will further increase external and internal mismatch based on pointing error then af fect system performance. When pointing error is relatively small, optimizing beam wander will improve system performance more, and when pointing error is relatively large, optimizing internal mismatch will improve system performance more. The research results of this paper have important reference significance for the actual engineering design of satellite chaos laser safety communication system, and lay the foundation for the promotion of terrestrial high-speed chaos laser safety technology to the field of space-integrated-ground.更多还原