Laser Radar Simulation Device And Experimental Research

Lidar is now applied widely in the military and civil field because of a series of unique advantage, such as extremely high angle resolution, distance resolution, velocity resolution, wide range of measured speed, many kinds of pictures from objects, strong ability of anti-jamming and less volume and weight than microwave radar. Recent years, with the development of lidar, it has attracted much attention of militaries of many countries and become research highlight of this field due to its advantage of high frame resolution, broad field of view, solid and small volume. It is very necessary to research the imaging lidar for meeting the present urgent requirement. In this article, the imaging lidar with staring is verified in principle, the key technology is studied, the lidar simulation prototype is developed, and its performance is also characterized. The research results can be used in the field of investigation, guidance, underwater detection, measuring the unclean etc, and it has wide application prospects.For meeting the requirements of lidar launch system in this study. Nd:YAG laser and launch optical system are used to change beam divergence angle of shooting laser. The whole launch system is studied and its loss of energy beam expander ability is also measured.Receive system of lidar simulation prototype is the most important part in the study. First, according to the design requirements, single optical lens system is designed using software, and the joining together is carried out to gain greater receiving view, subsequently, an optical compound eye system is obtained after assembly. The selection of parameters and APD detector are discussed and the corresponding circuits are designed. Via the numerical calculation, a step-index optical fiber with reasonable aperture is obtained, the influence of mechanical alignment error on the coupling efficiency is systematically investigated, and the coupling efficiency is determined in the experiments, the processing precision optical coupler is designed for ensuring accurate docking. At last, analyzing and studying the experimental results from a single fiber signal, the ability to test distance is measured and the basic properties of the compound eye receiving system are discussed. Presently, the laser scanning imaging mostly for a launch corresponding to one imaging point. In order to get high resolution imaging, a very high laser frequency is required, which makes light information processing face a lot of difficulties. In this proposal, using wave surface division technology, a group of distance data can be obtained from the compound eye array as a laser pulse is applied so that the detection and guidance are realized. The system adopts the special design of arrays lens to comprise bionic compound eye, further, through the coupling between optical fiber "analog neural" and array detector, a group of distance information of imaging pixel is obtained after converting the processes of receiving laser signals of APD detectors by the corresponding circuit, so that3d images of target distance is formed through comprehensive analysis of data. Considering the requirement for expanding the field of the view, sound-light scanning system is used in the experiments because the missile to the number of compound eye miniaturization with restrictions and scattered angle of laser beam expander limit. It is different between sound-light and mechanical scanning in the facility, although the laser beam is scanning, the emitting and receiving devices are fixed, the scan solution can only be used in the smaller field of view, sound-light scanning is very appropriate choice because the missile guidance system monitoring the view is very small. Comparing with quaking-mirror scanning, sound-light scanning has the advantage of stable, reliable, and high strength of light hurt. From the basic principles, using the selection of TeO2as sound-light material, the direction of laser transmission can be changed by the use of light deflection technology based on sound-light, furthermore, to develop1d tunable sound-light deflection device with the deflection angle of2°, the scanning mode can switch through changing the rf signal frequency. This research focuses on the improving method to the diffraction efficiency of the sound-light deflection device, the deflection angle of sound-light scanner and introducing loss are determined and the corresponding to reason is also systematically analyzed.The processing system of the lidar simulation prototype is studied. The circuit, components and working flow in the whole system is exclusive studied. Based on these studied, the experiments of measuring distance of monocular and compound eyes are performed. From the experimental results, it can be seen the prototype system has high precision and can reflect the outline of target detection and meet the requirements of missile guidance.