基于窄带步进频率的旋转目标三维ISAR成像

针对窄带发射信号，该文提出了基于步进频率的高速旋转目标三维成像方法。在运动补偿的前提下，首先利用单距离匹配滤波在子脉冲内进行二维逆合成孔径雷达像，然后结合CLEAN技术估计散射点参数，利用此参数在多个步进信号之间及多个距离单元内分别进行ISAR成像，最后利用频域距离合成技术在距离向实现高分辨，从而实现三维成像。该方法避免了旋转目标所引起的多普勒变化对距离合成的影响，能有效提高距离分辨率。多个散射点目标的仿真验证了该方法的有效性和可行性。

Three-Dimension ISAR Imaging of Spinning Targets Based on Narrow-Band Stepped-Frequency

A 3-D inverse synthetic aperture radar imaging method based on stepped-frequency waveforms for high speed spinning targets is proposed in this paper, aiming at the signal with narrow-bandwidth. Assuming the motion compensation is completed, single-range matching filtering is performed in certain sub-pulse firstly to obtain ISAR image. Then parameters of scatters are estimated using CLEAN technique. ISAR images are obtained in different sub-pulse and different range bin. At last range synthetic profile processing is performed to get high resolution in range and the 3-D image is obtained. This method can void the Doppler influence of spinning targets on range synthetic and improve the resolution effectively. Simulations of multiple scatters validate the feasibility and superiority of the approach.