Fpga Technology-based Laser Ranging System

The essay is based on the project of LRF (Laser Range Finder). It describes the meritand demerit of every class of LRF. EventUally I choose the way of using the laser-pulse tohave the range-measurement. I work hard on this measurement comprehensively.The result of this essay is to design the digital signal processor based on FPGA, tocode and decode the laser signal, to scale down the clock of launching part of the lasersystem and to use the PLL in the FPGA to make the frequency multiplication and so on.These make the system more stable and accurate. Using the parallel counter to count thepulse of the laser can increase the precision of the system. The essay considered manyreasons which may cause the inaccuracy. Amending these make the system more accurate.It has four patterns which will be used in different environment to make the gauge morereliable.In the receiving part of the system we receive the backward wave of laser using thewindow function in an active way. Usually the designer will receive the backward wave oflaser directly in a passive way. Using the spectral filter in this part can increase the noiseimmunity of system. The system has characteristics of small volume and low power andcan use in the range of 0.5-50 meters. It can be divided into the category of the short-rangeLaser Range Finder.