调频步进雷达ISAR成像方法

针对调频步进雷达的ISAR(Inverse Synthetic Aperture Radar)成像问题,提出了一维距离像和ISAR成像的分步补偿方法.通过优化雷达系统参数,在保证抽取损失和伪峰幅度在容许范围内的同时最大化了一维距离像的速度补偿误差容限.一维距离像运动补偿参数通过拟合子脉冲包络对齐的平移量获得,当拟合脉冲数足够多时,估计精度在一维距离像的速度补偿误差容限以下;对目标一维距离像进行包络对齐和相位聚焦完成ISAR成像的运动补偿.最后,通过仿真分析验证了算法的可行性.

A Method of ISAR Imaging via Stepped Frequency Modulated Radar

A stepping compensation approach is proposed for high-resolution range profile(HRRP) and ISAR(Inverse Synthetic Aperture Radar) imaging,aimed at the ISAR imaging via stepped frequency modulated radar.By optimizing radar system parameters,the maximum upper bound limit for target velocity estimation error is obtained with the guarantee that extracting loss and spurious peak amplitude are under the permit bound.The motion compensation parameters of HRRP is acquired by fitting the translational compensation of the envelope alignment with the sub pulses,when the number of fitting pulses is enough and the estimation error is lower than the permit bound of HRRP velocity compensation error.The motion compensation of ISAR imaging is accomplished by the envelope alignment of target HRRP and the phase focusing.The simulations testify the feasibility of the algorithm.