有源压制式干扰对MIMO引信测距测速的影响

Active Suppression Jamming Influence on Range and Velocity Measurement of MIMO Fuze

针对有源干扰对MIMO引信影响较大的现状,从干扰波形方面分析干扰机理,并从信噪比增益方面对比分析了三种常见有源干扰对基于相位编码MIMO引信测距测速的影响。理论分析表明当噪声干扰带宽与回波信号带宽重叠时,即当干扰频率与载频相差多普勒频率时,干扰信号类似于目标回波信号,对引信测距测速影响最大。噪声调幅、噪声调频、噪声调相这三种有源干扰中,噪声调幅对测距测速影响最大。利用Matlab构建基于相位编码体制MIMO引信信号处理平台,仿真结果验证了理论分析的正确性,为相关工作者以后提出抗干扰算法提供了理论依据。

The active jamming has strong impact on MIMO fuze.The jamming mechanism was analysed by studying the jamming waveform.The influence of three kinds of common active jamming on the range and velocity measurement of phase coding MIMO fuze was analyzed and compared from the aspect of SNR gain.Theoretical analysis showed that the maximum impact on the fuze was the bandwidth of the jamming and the bandwidth of the echo signal overlap,that meant when the difference between jamming frequency and the transmit signal frequency was Doppler frequency,the jamming was similar to the echo signal,which had the greatest impact on the range and velocity measurement of MIMO fuze.Among noise AM jamming,noise FM jamming and noise PM jamming,noise AM jamming had the greatest impact on the range and velocity measurement of MIMO fuze.MIMO fuze signal processing platform based on phase coding was constructed with Matlab.The simulation results verified the correctness of the theoretical analysis.