Laser Radar Ranging Peak Estimation And Ranging Accuracy Analysis

Ranging accuracy is an important indicator to measure the performance of laser radar,it directly affects the process of target three-dimensional reconstruction,identifying and center positioning.It is very important to study the problem of lidar ranging accuracy problem for the optimized design of the system and the subsequent application development.Based on the laser radar peak estimates ranging process simulation and the Cramer-Rao lower bound in the modern estimation theory, this paper analyzes the best state of the lidar ranging accuracy.So the thesis has not only stronger practicality, but also a certain academic value.Based on in-depth information investigation, this paper gives the laser radar peak estimation range process model, writes the Monte Carlo simulation program in Matlab software environment, and analyzes the influence of statistical characteristics of the laser radar range and range precision impacted of the amplitude, bias and pulse width by numerical simulations and experiments in the poisson and gaussian noise conditions. On the basis of the simulation study, using Cramer Rao lower bound analyzes laser radar range accuracy, and compared and analyzed with simulation results. Research results show that through the fixed variables method:â‘ The received signal is determined by the amplitude,bias and pulse width.With the increases of amplitude, Poisson and Gaussian noise distribution Laser radar range accuracy are closer to the Cramer-Rao lower bound, the ranging accuracy is higher,and the range of Ranging Statistics discrete distribution is narrower when the pulse width and the fixed-bias,but when amplitude is very small, ranging accuracy does not meet the Cramer-Rao lower bound, because the received signal is almost bias, does not meet the Cramer-Rao conditions;with the increase of the bias, precision is lower, deviates from the Cramer-Rao lower bound, distance statistical distribution range is wider when the width and amplitude are fixed; when the amplitude and bias are fixed, as the pulse width increases, the laser radar ranging precision is lower, deviates from CRLB, distance statistical distribution range is wider;â‘¡For the same parametric conditions, Gaussian noise distribution lidar ranging accuracy is higher than the Poisson distribution;â‘¢Then the pulse width is unknown, filter pulse width are fixed regardless of what the pulse width is, with the increase of amplitude, ranging accuracy becomes lower, and the actual width smaller, precision is lower, deviates from the Cramer-Rao lower bound;â‘£For a fixed beam pulse energy, research showed that when it divides into more the pulse number ranging precision is more lowerIn addition, the paper still studied the range range precision influenced by different amplitude and bias in the experiment, Compared with the simulation results and the Cramer-Rao lower bound, and showed that Cramer-Rao lower bound is the upper limit of the accuracy of the estimated parameters for unbiased estimator based on the correctness of the theoretical results.