No Scanning Range Imaging Laser Radar System Is The Key Technology Research

LIDAR uses laser as a light source, the laser light source has more excellentcharacteristics than ordinary light source.the laser light can be used in the laser radarsystem to get very high spatial resolution for its monochromatic and coherentcharacteristics.the laser light also can be used to prevent noise interference of the radarsystem. Laser radar can be used for distance measurement, angle tracking, and thespeed of target as well as the indication of moving target. Laser radar also can track thetarget of the low altitude flight and concealment performance. Laser has theincomparable superiority of ordinary electromagnetic waves and highbrightness,monochromatic strong direction,a high degree of coherence.therefore,thethree-dimensional laser radar can be widely used for such as the field of militarytechnology,industry and the agriculture,medicine,science experiments and so on.Especially the three-dimensional scanning laser radar does not use mechanicalscanning structure to the imaging speed of a substantial increase in,which is thedevelopment direction of the laser rader.the main work of this paper is to build the newlaser radar ranging model and analysis the signal processing of the scanning laser radarsystem.This paper introduces the basic principles of three-dimensional laser radar,andthen starting from the laser radar theory discussed several lightmodulation,Andatmospheric transmission characters as well as the various subsystemsof the imaging,there are various of ranging theories and its shortcomings.Generally speaking, most of the ranging measurement is the difference frequencydigital phase measurement of the laser radar system.but the measuring frame rate is veryslow as well as the distance precision.3D imaging LiDAR based on half-rectangle torectangle correlation method was proposed.The architecture of the system and theprinciple of phase ranging algorithm are discussed with Matlab simulink simulationresults for one-dimensional distance.The imaging precision is also analyzed.Thesimulation show that this algorithms and principles are effective and modulation depth are greater than1.2.The simulation verifies the theory result.useful for research ofphase-shift laser rangefinder.there was a contradiction between ranging accuracy andworking range.dual-frequency modulation as the way to solve this problem,differencefrequency phase measurement can reduce the circuit complexity to improve systemstability.this is the fisrt time using malab based on the idea of modulationsystem.automatic digital measurement,the frequency-domain digital mapping digitalsynchronous demodulation phase measurement method were compared.there aredetailed discussion of measurement errors about these methods,and solutions areproposed for the single-phase frequency drift and atmospheric refractive index.aboveall,theoretically proved a high accuracy and fast difference frequency ranging laserradar system,a useful exploration for the three-dimensional laser radar research and thefoundation for the production.