Abstract: The difference of the image generated by real target and Digital-Image-Synthesiser（DIS） is analyzed.Then two methods are deduced to recognize deceivable jamming generated by DIS.One is the uncontinuity of the false target in cross section（Doppler dimension） which is caused by the quantization of phase increment，and the other is the changing number of the target in the imaging field after ISAR processing when the Pulse Repetition Frequency（PRF） of the DIS is unmatched with the opposed radar’s PRF.With the two methods，the limitations of DIS deceivable jamming are found，and the false targets generated by DIS are effectively recognized.

摘要： 分析了数字图像合成器（DIS）生成的目标图像与真实目标图像之间的异同点，经过推导，得出识别数字图像合成器欺骗式干扰的方法：由于相位增量量化导致欺骗式假目标在横向多普勒方向上图像不连续；脉冲重复频率不匹配时，由DIS生成的欺骗式假目标经ISAR处理后在成像视窗内目标数量会发生变化。从而发现了数字图像合成器欺骗式干扰的缺陷，对识别这种干扰的假目标具有决定意义。