基于线性调频步进信号的高速目标ISAR成像

该文讨论了一种利用线性调频步进(LMSF)雷达信号通过频域带宽合成以进行高距离分辨率逆合成孔径雷达(ISAR)成像的方法。文中建立了高速目标的回波模型。为了精确估计高速运动目标运动参数，给出了利用包络对齐和多普勒中心估计拟合目标运动轨迹的方法。针对ISAR中目标回波的特点，对原始的多普勒中心估计方法进行了改进，提高了运动参数估计精度。最后给出了处理流程，并用仿真结果验证此种方法的有效性。

ISAR Imaging of High Speed Targets Based on LMSF Signal

To obtain the higher range resolution Inverse Synthetic Aperture Radar (ISAR) image, a method by combining the bandwidth of the Linearly Modulated Stepped Frequency (LMSF) radar signal in frequency domain is discussed. The model of high speed moving targets is proposed. In order to estimate the target motion parameters accurately, the method employing envelop alignment and Doppler center estimation is provided to fit the track of moving target. Based on the characteristic of target echo in ISAR, the original method of Doppler center estimation is ameliorated to increase the motion parameter estimation precision. Finally, the processing scheme is proposed, and the simulation results show that the method is effective.