Optimum signal threshold ratio for improving the ranging accuracy of lidar

In order to improve the ranging accuracy of a lidar,the effect of amplitude and width of the echo signal on the ranging accuracy of a lidar with bell-type laser pulses in temporal domain and Gaussian pulses in spatial domain,was studied under the condition of constant-voltage-amplitude discrimination.For different discrimination level,the range error induced by the variation of amplitude and width of echo signal exhibited reverse variant tendency.As a result,the concept of optimum signal threshold ratio was proposed to improve the ranging accuracy of the lidar and its computational formula was also presented in this paper.Further more,the existence of the optimum signal threshold ratio was verified through experiments under different signal threshold ratio and the experiments showed that the optimum signal threshold ratio of our lidar was about 1.8.The study results provide the basis for the reasomable selection of the lidar to identify the level under different application conditions.