Video frequency accumulation for the improvement of signal-to-noise ratio in laser probing
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School of Science, Nanjing University of Science & Technology, Nanjing 210094, China;
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2.
Xi'an Modern Control Technology Research Institute, Xi'an 710065, China
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Corresponding author:
LI Zhen-hua, lizh.Enhua11@mail.njust.Edu.cn
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Received Date:
2009-02-16
Accepted Date:
2009-09-11
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Abstract
In order to investigate the availability of multi-pulse video frequency accumulation for the improvement of signalto -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(1/2) 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(1/2) 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.
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