LFM脉冲压缩雷达的随机移频多假目标干扰技术研究

Random Frequency-Shift for Multi-False-Target Jamming of LFM Pulse Compression Radar

针对LFM脉冲压缩雷达回波信号距离和多普勒频率存在耦合这一特点,在阶梯波移频干扰的基础上,提出了随机移频的干扰方法。在雷达回波信号中心频率正负二分之一带宽内附加随机的多普勒移频分量,可产生分布在真实目标周围的随机假目标。随机移频干扰技术产生的假目标随机性强,使得雷达无法通过假目标频率补偿得出真实目标的位置,并且随机移频产生的假目标相对于雷达是部分适配的,因此假目标在一定程度上会展宽,当附加随机移频点接近于雷达中心频率时,产生的假目标甚至可以覆盖真实目标,从而达到较好的干扰效果。

LFM radar signal has coupling between the range and Doppler frequency .Based on the method of ladder wave jamming,a method of random frequency-shift jamming was proposed .Random Doppler frequency-shift component was added in center frequency bandwidth of the positive and negative half ,and false targets could be generated,randomly distributed around the real target .Random frequency-shifting technique has high randomness,thus the radar can＇t obtain the position of the real target through frequency compensation of multi-false-target.The false-target generated by random frequency-shifting is partially adaptive to the radar,thus the false-target range can be broadened .When the random frequency-shifting is close to radar＇s center frequency,the generated false-targets can even cover the real-target and achieve very good effect .