A Method for Improving the Laser Ranging Accuracy by Using FPGA

This paper presents a method to improve the pulse laser ranging system in order to get a higher accuracy.On the basis of the traditional laser ranging technology,the FPGA is used as the master chip and the frequency doubbing technology of DCM is adopted to manage the clock frequency in order to control the palse frequeny of the laser transmitter.The echo signals obtained by the laser detector are processed with the approach of peak detection.Furthermore,this paper analyzes the factors which influence are detection performance,such as the measurement error of time interval,pulse width of laser,A/D conversion rate and so on.The experimental results show that the ranging accuracy of the improved laser ranging system can reach 0.8 m when the global clock frequency of FPGA is 300 MHz and the measured distance is 100 m.