针对解线调ISAR的图像欺骗干扰研究

摘要

通过详细分析解线调距离成像的原理和特点,提出一种针对解线调ISAR的图像欺骗干扰方法.该方法首先利用假目标模板计算得到幅度、相位和频率调制系数,然后对接收的ISAR信号进行幅度、相位和频率3方面综合调制,最后将生成的假目标干扰信号转发给ISAR.经理论分析和仿真实验表明,由于与原信号保持了良好的相干性,转发调制的假目标干扰信号经ISAR的解线调脉冲压缩和方位向压缩处理后,能够产生清晰的一维距离像和二维假目标图像.并且通过合理设置假目标模板,适时改变调制参数,能够实时逼真地产生ISAR假目标,可以进一步提高图像欺骗干扰效果.%Through detailed analysis of the principles and characteristics of ISAR dechirping technology,a method on image deception against the ISAR using dechirping technology is proposed.In this method,amplitude,phase and frequency modulation coefficient are calculated from a false target template in advance,then the received ISAR signals will be comprehensively modulated by them,finally the generated false target jamming signals will be transmitted to ISAR.The theoretical analysis and simulation results show that because of the close coherence between the false target jamming signals and the original signals,the false target jamming signals can generate clear one-dimensional range images and two-dimensional false target images through the processing of ISAR.Reasonable settings of false target template,timely changes of modulation coefficients,can help providing a real-time and realistic ISAR false target,and it can further improve the image deception jamming effect.