Improving The Measurement Range Of The Pulse Laser Ranging

In the case of long-distance direct detection of the pulsed laser ranging system, the signal-to-noise ratio of the echo signal is very weak. In this paper, a multi-pulsed detection method is researched both in the theory and the experiment to solve the problem, so as to improving the range of the laser range finder.The detection equation and the SNR equation are obtained by researching the basic principle of laser ranging and its detection ability. Based on our experiment environment, the paper focuses on the echo signal power, wave, the noise equivalent irradiance, the bandwidth of acceptor circuit.According to the statistical character of laser echo, after the analysis of the performance of the single pulsed detection, the detection principle of the video integration and binary integration are studied to improve the measurement of the system. Then the relationship of the SNR of the video integration and the number of the pulses is found. According to the binary integration, the expressions of detection probability and false-alarm probability are developed. Also, the optimum values of the first threshold and the second threshold are gained. The performance of the video integration is better than the binary integration in theory research. But in the usage in our system, the video integration is so complicated that we prefer to use the binary integration.The experiments are done using a laser ranging system which is designed according to theoretical research. From the experiments, in the distance of 850m, the single pulsed detection is useless. But through the binary integration, the SNR is improved and the distance of 850m is detected.