弹载双基前视SAR俯冲段成像制导路径优化研究

Trajectory Optimization of MBFL-SAR Imaging for the Phase Diving to Targets

摘要:

弹载双基前视合成孔径雷达（Missile-Borne Bistatic Forward-Looking Synthetic Aperture Radar，MBFL-SAR）可实现俯冲段全程二维高分辨率成像，还可实现导弹间的协同作战，提高制导精度。针对此构型下发射机轨迹直接影响双基成像分辨率的问题，分析了MBFL-SAR构型下的俯冲段二维分辨率特性，结合导弹的运动特性，在二维分辨率及导弹运动学对弹道的约束下，把导弹的三维加速度变化量作为优化变量，构建了与场景内分辨率夹角相关的目标函数，利用参数自适应的改进遗传算法进行发射机弹道优化仿真。与现有的基于线性衰减模型的轨迹设计方法相比，本文所提的轨迹优化方法可更好地满足高分辨率成像的要求。

Abstract:

Missile-borne bistatic forward-looking synthetic aperture radar (MBFL-SAR) can achieve full-range, forward-looking, two-dimensional high-resolution imaging during the diving phase, enabling collaborative combat between missiles and improving guidance accuracy. In response to the issue that the trajectory of the transmitter directly affects the resolution of bistatic imaging, the two-dimensional resolution characteristics of the diving phase in the MBFL-SAR are analyzed. Combined with the motion characteristics of the missile, under the constraints of two-dimensional resolution and missile kinematics, the three-dimensional acceleration variations of the missile are used as optimization variables, and an objective function related to the angle between the resolutions in the scene is constructed.An improved genetic algorithm is employed for the trajectory optimization of the transmitter. Compared with the existing trajectory design method based on a linear attenuation model, the trajectory optimization method proposed in this paper can better meet the requirements of high-resolution imaging.