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14 February 2005 Study of single photon echo detection technology in underwater target ranging
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Because laser is scattered and attenuated acutely by the water, diffuse reflection of Gauss laser pulse comes back with discrete single photon. These discrete single photon can not form a complete echo wave corresponding to original laser wave. The detector can only output discrete pulses with probability of η(quantum efficiency) . The discrete pulses caused by echo wave, background light, electron hot emission of detection do not have distinct different characteristics in time domain or frequency domain, so echo wave can not be distinguished from these discrete pulses by traditional detection method. Through analysing the signal and noise statistic characteristics., we put forward a method that apply known probability model to detect probabilistic echo signal to resolve the problem hereinbefore mentioned images. The signal is very low in underwater laser ranging, so it is very difficult to recognize the echo wave. This paper introduces n method and uses it to process the signal. digital threshold detection is simulated with laser ranging radar and we get good results. This study will help to greatly improve the ability of laser ranging radar.
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Xiao Lin Sui, Zheng Yu Zhang, Xiao Long Zhang, Fei Xuan, Ming Yu, Xiao Jun Tang, and Shou Huan Zhou "Study of single photon echo detection technology in underwater target ranging", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005);

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