基于聚束逆合成孔径激光成像雷达组的三维目标重构的研究

Research on Three-dimensional Target Reconstruction Based on Spotlight Mode Inverse Synthetic Aperture Imaging Ladar Group

为了在聚束逆合成孔径激光雷达成像中获得三维重构需要的高程信息量,设计了基于聚束逆合成孔径激光成像雷达组的目标重构算法.系统在等边三角形三个顶点上分布安置逆合成孔径激光雷达,根据位置和倾角的关系,由另两个激光雷达提供三维目标重构的高程信息.计算了被测目标任意方向进入系统探测区域后,三个逆合成孔径激光雷达对应的高程函数表达式.通过仿真实验可知,被测目标的速度对高程函数没有显著影响.而逆合成孔径激光雷达与目标的角度关系对高程信息变化有显著贡献,在采用不同位置高程信息融合的过程中,选择逆合成孔径激光雷达的分布方式对回波数据的利用率有影响.由于不同角度变化产生了连续变化高程信息,利用该方法可以有效地通过获取高程信息重构目标三维图像.

In order to obtain the information of elevation which three-dimensional reconstruction needs in the spotlight mode inverse synthetic aperture ladar imaging,a target reconstruction algorithm was designed based on spotlight mode inverse synthetic aperture imaging ladar groups.The systems were placed inverse synthetic aperture ladar in the three vertices of an equilateral triangle.According to the relationship between the position and the inclination angle,the elevation information for reconstructing three-dimensional target could be provided by another two ladars.The elevation functions of three inverse synthetic aperture ladars were calculated when the measured target flied into detects area of the system in any direction.Simulation result shows that the speed of the measured target has no significant effect on the elevation function.Angular relationships of inverse synthetic aperture ladar and target have a significant contribution to the changes in elevation information.In the process of information fusion for different position elevation,the selection of distributed manner for inverse synthetic aperture ladar impacted the utilization of echo data.Because different angles change produces continuous changes in elevation information,this method can effectively reconstruct target three-dimensional image by elevation information obtained.