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中文摘要：
逆合成孔径雷达由于其独特的成像原理，具有比普通雷达更强的抗干扰能力。调频步进信号具有在保持瞬时带宽较小的同时通过合成宽带技术获得距离高分辨，降低系统实现复杂度的优点。提出了一种基于线性调频信号对调频步进信号体制成像雷达相干干扰方法，利用线性调频信号对调频步进雷达接收到的回波信号进行附加的频率调制和相位调制后转发，来破坏ISAR成像的方法。由于线性调频信号与线性调频步进信号有相似的频域特性，因此可以获得一定的处理增益，从而降低干扰功率。仿真试验表明这种方法行之有效。
英文摘要：
Inverse synthetic aperture radar（ISAR） has greater capability of anti-jamming than the conventional radar due to its peculiar characteristic. Frequency-stepped chirp signal can achieve total large bandwidth while maintaining narrow instantaneous bandwidth, thus reducing the complexity of radar systems. A method for jamming the frequency-stepped chirp ISAR is proposed, where the received signal is retransmitted with additional frequency and phase modulations using linear frequency modulation （LFM） signal. Because of the similarity of characteristic in frequency domain between the LFM signal and frequency-stepped chirp signal, the proposed method can obtain some processing gain and than save the jamming power. Simulations are given to validate the effectiveness of the proposed method.
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