Design Of Pulse Laser Ranging Telescope

The civil laser ranging telescope has great prospect for development and application,therefore,many companies both at home and abroad regard it as a focus of the research and development.The current domestic market for laser ranging telescope generally has the problem of low measurement accuracy.Therefore,it has high engineering application value to design a small,lightweight,high-precision and easily operated laser ranging telescope.This thesis studies the design of optical system and ranging circuit system of high-precision pulse laser ranging telescope.The main research contents are as followed:Firstly,the development status and existing problems of laser ranging telescope at home and abroad are analyzed comprehensively.The advantages and disadvantages of the phase method laser ranging and pulsed laser ranging are compared.On this basis,the overall design scheme of the laser range f-inder system is proposed.Secondly,the optical system of laser ranging telescope is designed according to the principle of optical design.It mainly includes telescope system,laser emitting optical system and laser receiving optical system·In the light of the miniaturization of laser ranging telescope requirements,the composite prism was added in design to shorten the total length of optical and turn the beam,which thereby realize the share of objective between the laser receiving optical system and the telescope system.The image evaluation of the designed optical system shows that the imaging quality and aberrations of the optical system of the range finder satisfy the design requirements.Thirdly,the laser ranging hardware circuit and related software design are completed.The range hardware circuit mainly includes laser emission module,laser receiving module,time identification module and time interval measurerIment module.The laser pulse is produced by the pulsed laser diode The photoelectric detector chooses APD avalanche photodiode to receive the echo signal.The high-precision time measurement chip TDC-GP22 is chosen to measure time interval STM32 is used as the master chip,to control the TDC chip.In Keil software,the program is programmed in c language to realize the configuration of time measurement chip and the processing of measurement data which is displayed on the upper computer.Finally,the experimental platform is set up to verify the stability and accuracy of the system.The experimental results show that the precision of the laser distance measuring system designed in this thesis is better than ±0.5m at 500m,which basically realizes the design requirements of hand-held laser range finder characterized in high precision,small size and lightweight.