弹载下降段大前斜聚束SAR成像时序设计

Sequential design for highly squinted missile-borne spotlight SAR imaging on descent trajectory

提出了一种基于场景点遍历的多普勒带宽计算方法,该方法能得到准确的脉冲重复频率(pulse repetition frequency,PRF)下限值,解决了传统计算方法存在的发射脉冲数过多及PRF参数无法设计的问题,同时解决了雷达方位与俯仰波束宽度不一致时,PRF下限值较难准确计算的问题。构建了基于雷达系统参数和弹载高动态运动特征的PRF参数设计模型,在此基础上提出了通过减小等效斜视角和雷达平台速度的发射脉冲数最小的弹道优化方法。弹道仿真验证了本文方法能较好地满足工程应用中弹载下降段大前斜聚束SAR成像时序设计需要。

A novel method for computing the Doppler bandwidth based on traversing the scene scattering point is presented, This method can get the accurate lower limit value of pulse repetition frequency （PRF）, which solves the problems that transmitting pulses are overmuch and PRF parameters are incapable to design with traditional methods. Meanwhile, in the case of different azimuth and pitch beam width, the problem of ex- actly calculating the PRF lower limit value is solved. A model for PRF parameters design is constructed accor- ding to radar system parameters and the missile borne high dynamic motion feature, on the basis of which, a method for trajectory optimization is proposed to minimize the transmitting pulses by reducing the equivalent squint angle and the velocity of the radar platform. Trajectory simulation results validate that the proposed method can better meet the need of sequence design for high squint missile borne spotlight synthetic aperture ra- dar imaging on large maneuvering descent trajectory in engineering application.