激光敌我识别中应答机系统的研究与设计

【作者】 张向前；

【导师】 杨亚培；

【作者基本信息】 电子科技大学 ， 光学工程， 2005， 硕士

【摘要】 现代战争中,由于敌我目标识别不清,致使误伤己方和友方的事件时常发生,这使敌我识别技术的研究非常迫切。本文在分析和论述了国内外敌我识别技术的发展现状和趋势后,从理论分析和系统设计两个方面研究了一种基于激光通信的敌我识别技术中应答机子系统设计的有关技术问题。 本文作者对应答接收机系统的组成及原理进行了论述,对一些器件的选择和参数确定进行了讨论。采用了直接探测技术对询问光信号进行探测。对激光接收系统的光路和视场等进行了分析和设计;讨论了背景辐射和大气对探测灵敏度的影响。对系统的识别距离进行了分析计算。设计了信号放大及处理电路。提出了一种得到回波光束的新方法。这种方法可以巧妙地实现无源应答,并使光束沿原路返回。利用这种方法使光路更加简单,它不仅能解决目标跟踪和瞄准的难题,同时还能大大减小了光能量损耗,这样可以扩大目标的识别范围,同时还可提高探测灵敏度。此外,作者将布拉格声光调制器用到回波光束的调制中,实现了高速有效的回波调制。采取光、电两方面结合的综合方法对背景辐射和噪声进行抑制,并对系统的电磁兼容性进行了分析计算和设计,有效地提高了探测灵敏度。更多还原

【Abstract】 In modern war, because the target can’t be clearly identified, so friends and ourselves are always hurt mistakenly. To consider this point, it is urgent to study the technology of laser identification Friend or foe (LIFF). The developmental circumstance and trends of outland and inland LIFF are stated in this paper. The technology problems about respondent receiver’s design are studied with theory synthesis and system design. This system that based on the laser communication is dealt with in this paper.The constitution and principle of respondent receiver system are stated in this paper, how to select the proper apparatus and the correct parameter was also discussed in this paper. The direct detection technology was adopted to detect optical signal. The light route and the area of view of laser receiving system were analyzed and designed. The influence to the sensitivity of detection by the backgrounds radiation and the atmosphere was discussed. The identification distance of the system was analyzed and calculated. The amplificatory circuit and transacted circuit of signal are designed. A new method by which the echo light was gained was put forward in this paper. This method can achieve the non-source responsion subtly and it can make the beam of light return along the original way, this method can make the light route simpler, Furthermore it can not only resolve the problems of track and collimation of the target, but also reduce the waste of the optical energy greatly. In this way its range of identification can be extended. Furthermore the Bragg sound and light modulator based on sound and light was used to modulate the echo beam of light and the modulation can be achieved effectively. The synthesis method combined by light and electricity is adopted to restrain the background radiation and the noise. The electromagnetism compatibility of the system is analyzed and designed, thus the sensitivity of detection is improved effectively.更多还原