| 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. |
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