基于改进FS算法的反舰导弹导引头成像研究

针对开发巡航式反舰导弹雷达导引头成像功能这一问题，设计了导弹的典型飞行轨迹，并采用改进的聚束式SAR—FS成像算法在导弹飞行过程中对舰船目标进行成像。导弹飞行过程中，斜视角随之变化，在接近目标时逐渐增大，改进的FS算法引入了SRC的非线性变标对数据进行二次距离压缩，有效地减少了距离压缩误差，以达到较好的聚焦效果，提高成像质量。计算机仿真结果表明，在末端成像制导阶段，当斜视角达到以上时，改进的FS算法也能达到较好的成像效果，为完成攻击点的选择，提高角跟踪精度创造了条件。

Study on Imaging for Anti-ship Missile Seeker Based on Modified FS Algorithm

To exploit imaging function of anti - ship cruise missile, this paper designs a typical trajectory of missile, and images the ship using modified spotlight Synthetic Aperture Radar frequency scaling algorithm during the missile flight. The squint angle varies during the missile flight, and it is aggrandized when the missile is close to target. A nonlinear scaling operation is adopted to cope with the range - dependent SRC in modified frequency scaling algorithm, which minishes SRC error effectively, so it can improve focus for imaging. Simulation result shows that in terminal control and guidance phase, the image from modified frequency scaling algorithm is good when the squint angle is up to 75 degree, which creates the conditions for choosing attack point and improving angle tracking precision.