摘要
为了研究多脉冲视频累积提高激光回波探测信噪比的途径的有效性,以噪声的统计特性为基础,理论分析了多脉冲视频累积提高激光回波探测信噪比的基本原理,并通过数值仿真和实验验证了视频累积提高激光探测信噪比的可行性。结果表明,当脉冲累积数N较小时,通过多脉冲视频累积可以提高激光回波探测的信噪比N^(1/2)倍,与视频累积结论一致;但当N大于一定值之后,由于系统带宽、A/D转换精度和采样率等因素的影响,使信噪比随累积脉冲数的变化明显偏离了N^(1/2)指数规律。该研究为进一步通过多脉冲视频积累探测改善激光回波探测的信噪比,实现强噪声背景下的弱信号检测提供了理论和实验基础,对提高半导体激光测距系统的探测能力有着直接的指导意义。
In order to investigate the availability of multi-pulse video frequency accumulation for the improvement of signal- to-noise ratio （SNR） in laser echo probing, based on the statistical property of noise, its basic principle was discussed. The feasibility was confirmed by means of numerical simulation and experiment. Results show that multi-pulse video frequency accumulation can improve the SNR with √N times in laser echo probing while the number of laser pulse N is small, and that if the number N is larger than a certain value, the relation between SNR and N deviate the √N exponential law due to the influence of system bandwidth, A/D precision and sampling rate. Those results provide a theoretical and experimental foundation to improve the SNR by pulse cumulation for realizing the detection of laser echo in strong noise. And it has important significance to enhance the detecting capability of laser ranging finder.
出处
《激光技术》
CAS
CSCD
北大核心
2010年第3期335-338,共4页
Laser Technology
关键词
激光技术
信噪比提高
视频累积
激光探测
laser technique
signal-to-noise ratio improvement
video frequency accumulation
laser probing
