Studies On The Staring Imaging Three-Dimensional Laser Radar System

Laser radar technology which can get the vertical structure information of targets on the ground has been widely used in acquiring geospatial information as an important3D measurement technology with narrow beam as well as high precision. Plane array3D active imaging laser radar can breakthrough the limitation of sigle point detection and scanning imaging methods, so it has attracted much more attention because of showing a direct, fast, accurate characteristic.In this paper, the domestic and foreign development situation of the plane array3D active imaging laser radar have been introduced. We introduce imaging principle and system structure of the plane array3D active imaging laser radar which based on the principle of gain modulated measurement. Hardware circuit system structure including signal drive control circuit, gating control circuit and gain-modulation circuit has been introduced. We obtain good linearity rise gain range by setting the system parameters which is calculated from theoretical simulation. Staring imaging laser radar can detect efficiently and analyze experimental results according with the timing signals.In this paper, we study the impact on the detection result of the laser radar system by composite targets. Our system detects the weighted average distance of an area not the boundary distance of an area. It indeed contribute to the gap between the experimental data and the theoretical data, which we can study in the future.Forest ecosystems play an important role in maintaining the global carbon balance. It has an important scientific significance to monitoring and study forest resources and forest structure information. Laser radar was always used to detect some targets such as buildings before. In this paper two types of experiments are made. First we detect the target of400m, the ranging error is less than1m and the distance resolution is0.6m; then we detect the complex target of50m, the distance resolution is0.4m. There is a certain gap between the experimental data and the theoretical data.