| As laser measurement technology has been widely applied, the ranging industryrepresented by the laser range finder will become more competitive. It is said that anycorporation or research institution that gets the lead in the field of precision laser rangingwill gain opportunities in the fierce market competition. Therefore, to improve the precisionof laser ranging has become a hot research content of many scientific institutions. It hasbecome the main focus of the laser institutes to utilize the time identification precision andthe time interval precision to study the laser ranging precision, while this subject proposes anew method on the basis of these theoretical studies, i.e., an improved dynamic pulsed laserranging precision algorithm is proposed based on Wavelet Theory. This method, whoseexperimental error is less than0.5m, meets the measurement requirements of the subject,thus, is feasible.This paper mainly studies from the following aspects:First, it analyzes and studies the background and significance of laser rangingtechnology, focuses on the classification of laser ranging technology and the performanceparameters of some rangefinders, and puts forward the optimization direction of laserranging techniques and the main problems that need to be dealt with. It also brieflysummarizes the research content and institutions of the entire paper.Second, it introduces the principles of laser ranging and lists the factors affecting thelaser ranging precision. As regards the laser ranging principles, it mainly introduces thepulsed laser ranging technology and the phase-shift laser ranging technology. Through thecomparative analysis and the combination with the actual situation of this project, thegeneral idea of using the pulsed laser ranging technology has been proposed. Concerning thelaser ranging precision factors, this paper analyzes several factors that impact the pulsedlaser ranging precision respectively, namely, the time identification precision, and the timeinterval measurement precision and noise. By analyzing the approaches that can clearlyimprove the pulsed laser ranging precision, it has made adequate preparation for thewavelet-based laser ranging precision in the subsequent chaptersThird, on the basis of the design scheme selection in the second chapter, it focuses on the methods and key techniques that can improve the precision of pulsed laser ranging. Animproved algorithm of dynamic pulsed laser ranging precision has been proposed based onWavelet Theory. This method proposes new threshold function based on the disadvantages ofWavelet Algorithm. The approach overcomes the shortcomings that the soft thresholdfunction has discontinuous derivatives, while the wavelet coefficients of hard thresholdfunction are also discontinuous after thresholding. The de-noising effect of data signal thathas been dealt with improved algorithm appears to be good, especially for the Gaussiannoise. This approach can improve the ratio of peak signal to noise, and the de-noised datasignal (echo signal) is more suited to the original signal.Finally, based on the preceding simulation experiment, the experimental platform forthis project has been built up with the use of existing laser rangefinder equipments. Datasignal is entered into the new platform for verification, whose results are in line with therequirements of the subject. |
