一种有源加性复合干扰的对抗算法研究

An Algorithm Research For Restraining Active Additive Compound Jamming

针对雷达有源加性复合干扰对抗的情况,传统的抗干扰算法只针对单一样式干扰进行抑制,很难做到有效权衡;由于有源复合干扰噪声功率高、欺骗性强的特点,为此提出了一种基于相位扰动的有源加性复合干扰对抗算法,该算法在斜变线性调频信号(SV LFM)信号的基础上,先对发射雷达信号的前后沿脉冲附加上一个扰动的相位,再通过与前一脉冲的匹配滤波,限幅处理和逆匹配,最后与当前脉冲进行匹配滤波处理,附加扰动的相位和限幅处理减弱了距离假目标信号的增益,而经过三次匹配滤波的作用,同样有效的削弱了大部分压制性干扰信号的成分,从而恢复出比较纯净的目标回波信号;通过实验仿真手段验证了相位扰动抗干扰算法的有效性,与传统直接匹配滤波的抗干扰算法相比,接收信号的信噪比提升了约25dB。

According to the restraining active additive compound jamming, traditional anti--jamming algorithm is difficult for balancing it with only restraining single jamming. Because of the feature of high noise power and hard deception, an algorithm for restraining active addi- tive compound jamming based on phase perturbed is studied. Based on the slope-varying LFM , the algorithm add a phase perturbed to the pulse edge of front or back from the radar transmitting signal. Furthermore, a pulse match filter With the front pulse edge is used, then the results are given a ＂punish＂ and anti-match filter. The phase perturbed and processing of amplitude limit weaken the signal gain of distance deception jamming, and also recede the signal gain of most blocking jamming under the three match filter. Finally, the echo signal can be restored from the previous pulse matched filter. The effectiveness of the phase perturbation anti--jamming algorithm was verified through the experimental simulation method. Compared with the traditional direct anti--jamming algorithm of matched filter, the signal--to--noise ratio of the received signal was improved about 25 dB.