基于DRFM的移频旁瓣干扰技术研究

摘要

The Doppler radar detects the moving speed of the target by measuring the Doppler frequency of the echo signal.In response to this feature,a method for frequency shift sidelobe jamming based on digital radio frequency memory (DRFM) with three kinds of jamming modes is proposed to improve the fidelity of false target and jamming effect.The jamming method is based on the sidelobe jamming technique of DRFM and the principle of direct digital frequency synthesizer (DDS).The Doppler frequency matching with false target is obtained by the formula derivation.The trend of false track and Doppler frequency with different jamming modes are obtained through software simulation.By theoretical analysis,the effectiveness and feasibility of the technique of frequency shift sidelobe jamming are verified.%针对脉冲多普勒(PD)雷达通过测量回波信号多普勒频率检测目标移动速度这一特点,为提高假目标逼真程度和干扰效果,提出移频旁瓣干扰并列举了3种干扰策略.该干扰方法基于数字射频存储(DRFM)的旁瓣干扰技术,结合真实目标运动特点与直接数字频率合成器(DDS)产生多普勒频率的原理,通过理论计算产生与假目标精确匹配的信号幅度和多普勒频率.经过软件仿真,得出不同干扰策略的假目标形成的虚假航迹和多普勒频率变化趋势,验证了移频旁瓣干扰技术的有效性和实现的可能性.