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中文摘要：
在低空飞行目标的ISAR成像中，回波信号常被地杂波掩盖导致无法进一步处理，如何有效地剔除杂波一直是困扰人们的难题。相消处理是一种典型而又简单易行的杂波滤除方法，首先对相消处理展开了一定研究，相干信号经过相消处理，可以有效地滤除固定地物产生的杂波，为后续的成像处理提供有利数据。针对线性调频步进信号体制ISAR，对回波信号的相邻脉冲串使用同一拉伸延时量进行处理，然后运用相消技术滤除杂波，最后再进行成像。仿真结果表明，文中提出的成像方法鲁棒性较好，可以获得较好的成像结果，为强地杂波背景下运动目标的ISAR成像提供了一种有效途径。
英文摘要：
The returned signal of low -attitude flying targets is often jammed by the strong ground clutter, so it is a difficult problem to eliminate the clutter effectively. Then, cancellation is a simple and valid method of eliminating the ground clutter. In the paper the cancellation of ground clutter in ISAR imaging of frequency - stepped chirp radar is presented. The identical amount of stretching time - delay with the adjoined bursts of echo is applied in the signal stretching process, and then the ground clutter is filtered by cancellation. After cancellation the coherent signal can provide useful data for the successive ISAR processing. Simulation results show that the proposed method is robust and effective, hence, it is a valuable approach to ISAR imaging of low - attitude flying targets.
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