锥柱复合目标激光距离多普勒像分析模型

Analytical model of range-doppler of cone-cylinder combination

激光距离多普勒成像技术在航天和国防应用领域受到极大的关注.文章建立了锥柱复合目标的激光距离多普勒像分析模型,包括底面的贡献.该模型能分析锥柱复合目标的几何参量、表面粗糙度、姿态、角速度和脉冲宽度等因素对激光距离多普勒像的影响,并能退化到圆柱和圆锥的激光距离多普勒像分析模型,也能退化到平面波下的多普勒谱分析模型.分析了几何参量和姿态对距离多普勒像的影响.计算结果表明,锥柱复合目标距离多普勒像能体现出目标的几何形状和姿态信息.理论和测量相结合,该分析模型能用来进行圆柱、圆锥及锥柱复合目标物理和几何参量的识别,其解析表达式对于多普勒速度计和激光雷达应用有着重要的意义.

The technique of laser range-Doppler image has been intimately noticed by aerospace and national defense circles. A analytical model of laser range-Doppler image of cone-cylinder combination is proposed in this paper. The analytical model includes the contribution of disk base. The analytical model can provide the effects of geometry parameters, the roughness of the surface, attitude, and pulse duration on laser range-Doppler image. This analytical model can reduce into the analytical model of range-Doppler image of cone and cylinder. This analytical model can reduce into the analytical model of Doppler spectra for plane waves. The influences of geometry parameters, and attitude are analyzed numerically by using the analytical model. The results indicate that the laser range- Doppler image of cone-cylinder combination can show the information about geometrical shape and attitude of target. Combining the theory and measurements, the analytical model can be used for indentifying physical parameters and geometrical parameters of cylinders, cones and cone-cylinder combination. This analytical solution is of significance for the laser Doppler velocimetry and ladar applications.