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中文摘要：
采用传统的距离-多普勒方法对直升机等含有旋转部件的目标进行ISAR成像时，旋转部件产生的微多普勒效应严重地污染了目标主体像。由于运动补偿后目标在谱图域表现为正弦谱图与直线谱图的叠加，基于直线谱图的幅度在短时间内的不变性。文中提出一种将相消技术应用于谱图域的微多普勒提取新方法，可快速有效地实现微多普勒信息的分离与提取，并获得较为清晰的目标主体像；仿真实验表明该算法具有较好的稳健性和计算效能。
英文摘要：
As for the ISAR imaging of a target with rotating parts, such as a helicopter, the quality of image is unsatisfied by using classical range-Doppler algorithm. The image of main body is severely contaminated by micro-Doppler effect generated by rotating parts. In spectrogram, the information of target is represented as the mixture of sinusoids and straight lines after motion compensation. The amplitude of every straight line spectrogram is invariable with respect to time in short time interval. Based on this idea, a novel method applying cancellation technique to spectrogram is proposed, which can quickly and effectively achieve the separation and extraction of micro-Doppler information and get clearer ISAR image of main body. The better robustness and lower calculation burden of the algorithm are proved by simulation experiments.
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