Key Technologies. Pushbroom Laser Three-dimensional Imaging Radar

Three-Dimensional line imaging laser radar has been experienced a rapid development in recent years; it has a wide range of three-dimensional imaging application in both military and civil use. While in the three-dimensional line imaging laser radar system, the high-power semiconductor laser array alignment system, laser array echo wave signal receiving system, the power of semiconductor laser and laser scanning track will have a direct impact on the imaging effect and detection distance.Some in-depth research such as the high-power semiconductor laser array alignment system, the power of semiconductor laser and laser scanning track are discussed in this paper and also conduct some optimization design and stimulation in optical collimation system and optical receive system.The main contents involved in this dissertation are as follows:1.Analyzing the system structure of three-dimensional line imaging laser radar system and the principal of the laser radar ranging. From the microwave radar range equation, and then elicit the equation of three-dimensional line imaging laser radar system.2.Using the computer stimulation to analyze the Spherical aberration-free double-surface - flat cylindrical lens when apply to the design of high-power semiconductor laser array alignment system and the influence of the laser divergence angle caused by the laser source vibration. The stimulation results show that such design has a good collimation effect, when the light spot vibrate within the focus range of 50μm , the divergence angle cannot beyond the 1mrad .3.According to the model matching theory, make some optimization design of Bragg fiber coupling of focused echo signal. As to Bragg fiber, when ignore the energy loss outside the core, the coupling efficiency are different under different models.4.Based on the laser radar detection equation, selected the laser wavelength 1550nm, and then obtain the relationship between laser detection distance and laser power. Through modeling the laser scanning track, get the minimum imaging pixel.