雷达波形的水印技术

Watermark technology of radar waveform

提出了一种抗有源欺骗干扰的新技术——雷达波形的水印技术。常规雷达波形易被干扰机截获并被分析出信号参数。若限定相位变化范围,按调整后的波形与原波形相关性最小的原则对原波形进行相位优化调整,在调整范围较小的情况下,干扰机一般并不能察觉出这种变化。雷达对相位调整后的波形用加权失配滤波器进行脉压,真正的目标没有损失,而对干扰机辐射的原波形却不能形成相关峰,这样,雷达就能自动地抑制欺骗式干扰形成的假目标。将这种具有防伪且保护雷达能正常检测目标功能的相位调整技术称为雷达波形的水印技术,所得的波形称为水印雷达波形。仿真结果证明了此方法的有效性。

A novel method of anti deceive jamming is proposed. Normal radar waveform is vulnerable to jammer＇s interception and analysis. If the phase of normal waveform is modified according to minimum correla- tion between the primitive and modified one,and if the phase varying is minor, the jammer may not percept it and still transmits the assumed norm waveform. Filtering the corresponding echoes with the weighted mismatched filter adapt to the modified waveform, radar can suppress the fake target introduced by the jammer without loss of real targets. Such method is called as watermark technology of radar waveform,and the corresponding waveform is called as radar watermark waveform, for it is analog to watermark in anti-counterfeit and product guard. The simulation results indicate the method is effective and feasible.