脉冲串互相关方法在远程激光测距中的应用  

Multi-Pulse Train Cross-Correlation Method in Remote Laser Ranging

作　　者：倪旭翔[1] 胡凯[1] 

机构地区：[1]浙江大学现代仪器国家重点实验室,浙江杭州310027

出　　处：《光学学报》2012年第11期120-125,共6页Acta Optica Sinica

基　　金：国家973计划(2009CB72400204)资助课题

摘　　要：基于单脉冲激光测距在远程激光测距中的局限性,提出了一种基于发射脉冲串与回波脉冲串互相关的信号处理方法。该方法将多个激光发射脉冲和回波脉冲作为一次连续信号同时数字化,然后进行互相关处理。采用激光强度与发射间隔可调的激光系统来模拟不同反射强度、不同距离的测距回波信号;通过处理不同信噪比的回波信号,来探究本方法对于回波信号信噪比的提升能力以及对于尖峰噪声的抑制能力。实验结果表明,该方法能够有效提高回波信号的信噪比,信噪比为0.11的弱回波信号经过处理后信噪比被提升到5.92,从而扩展了激光测距系统的测程,有效降低了探测系统的探测虚警率,提高了远程激光测距系统的弱回波探测能力。With the limitation of single-pulsed laser ranging technology in long distance laser ranging, a new ranging technology based on the cross-correlation between the transmitted pulse train is proposed. A laser system which can modulate pulse＇ s intensity and intervals is applied to simulate different echo pulses. A series of experiments are designed to explore the abilities of the technology in improving signal to noise ratio （SNR）, suppressing noise and measuring time, and good results are got. The SNR is improved from 0.11 to 5.92, which extends laser ranging, decreases alarm rate of the detection system and increases ability of exploring weak echo pulse.

关 键 词：测量 信号处理 远程激光测距 脉冲串 互相关 

分 类 号：TN247[电子电信—物理电子学]