Studies On The Airborne Dual-channel Three-Dimensional Laser Radar Imaging System

Laser radar technology has been widely used in three dimensional(3D) remote sensing field and 3D virtual and real field as an important 3D measurement technology with narrow beam as well as high precision. Plane array 3D active imaging laser radar has attracted much more attention because of light weight, low power consumption and high reliability.In this paper, the technology and development status of the plane array 3D active imaging laser radar have been introduced, on the basis of which a system research based on the principle of gain modulated measurement was carried out. The ranging principle of the plane array 3D active imaging laser radar has been introduced and the dual-channel bilinear modulation has been used on the basis of the original dual-channel single linear modulation. At the same time, we have introduced the detection method and the system composition of the dual-channel bilinear modulated laser radar as well as designed the signal control circuit and the modulated circuit. The unresolved problem of the power of the light source and the key technology of dynamic imaging has been introduced, based on which the key technology of airborne plane array 3D active imaging laser radar has been resolved.According to the relationship between the gain and the voltage of the MCP, we used RC or LC charging and discharging modulation for each group in order to get a linearly increasing or decreasing gain. The gray information with different distance modulations of the target will be obtained when the relative temporal relations of the gate and the gain modulation were controlled.In order to reduce motion blur under motion condition, we have designed a motion compensation system for detecting under an exposure time of 15 milliseconds on a flying plane, whose flight speed was 50 meters per second and flight height was 1000 meters. We used the rotating mirror and the piezoelectric ceramics for the laser radar imaging system detecting the same target for continually two times, thus the motion blur can be reduced. The major work of this thesis is doing static and dynamic experiments, using the dual-channel bilinear laser radar system with high power semiconductor laser and motion compensation system. Based on the dual gray data processing, we can get the 3D information of the target. When the target is 1000 meters far away, the ranging accuracy can be close to 1 meter for the stationary state or 1.5meters for the motion state, which achieved the long distance and high precision measurement...