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Pushbroom three-dimensional laser imaging radar key technology research

Author: ChenWeiJun
Tutor: YangHuaJun
School: University of Electronic Science and Technology
Course: Optics
Keywords: Imaging laser radar Beam collimating Semiconductor laser Coupling efficiency
CLC: TN958.98
Type: Master's thesis
Year: 2010
Downloads: 140
Quote: 2
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Abstract


Pushbroom laser 3D imaging radar after the rapid development in the last decade , has now become a very promising three-dimensional imaging of modern civil and military target detection . Pushbroom laser three - dimensional imaging radar system , collimation system for high - power semiconductor laser arrays , the laser array of the echo signal reception system , the relationship of the semiconductor laser power and the detection distance , the laser scanning track is very important , directly affecting the effect of the laser imaging and detection distance . Pushbroom three-dimensional laser imaging radar key technologies - collimation system of high-power semiconductor laser array , laser array echo signal receiving system , the determination of the semiconductor laser power , laser scanning trajectory in-depth research and the collimated optical systems and optical receiver system for the optimization design and simulation . The main contents are as follows : . Pushbroom laser 3D imaging system structure and lidar ranging principle , laser radar range equation derived from the analysis of the microwave radar range equation , in-depth study of the three-dimensional laser imaging principles. Computer simulation platform the spherical aberration hyperboloid - flat cylindrical lens to optimize the design of high-power semiconductor laser array collimator device , laser light source of vibration on the divergence angle of the laser . The simulation results show that the designed system has good collimator effect , the theoretically point light vibration focus 50μm range , the the collimated beam divergence angle of not more than 1mrad . According to the principle of pattern matching , Rubulage optical fiber coupled laser echo signal focus to optimize the design . For Bragg fiber , when the core outer energy loss is not considered , the optimal coupling efficiency of different modes of the laser is not the same. The analysis based on the laser detection range equation selected laser working wavelength λ = 1550nm, drawn laser detection distance and the relationship of the laser power . And laser scanning trajectory analysis modeling, minimum pixel draw imaging .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub- > Optical positioning radar,laser radar
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