基于分数阶相关的间歇采样转发干扰抑制算法

An Interrupted-Sampling Repeater Jamming Suppression Algorithm Based on Fractional Correlation

间歇采样转发干扰是一种典型的雷达有源干扰样式。为对抗自卫式间歇采样转发干扰,分析了干扰假目标生成机理,在此基础上,受时域相关、频域相关启发,设计提出基于分数阶相关的间歇采样转发干扰抑制算法。算法以一个相干处理间隔受干扰回波为处理对象,通过对不同重复周期回波进行不同阶次分数阶相关处理,改变假目标快时间位置分布,经相参积累达成干扰抑制目的。仿真结果表明,所提算法对间歇采样转发干扰具有一定抑制效能,经干扰抑制处理,真实目标有效检测临界干信比提升约25 dB,虚假目标抑制率大于50%。

Interrupted-sampling repeater jamming is a typical radar active jamming mode.In order to counter the self-defense interrupted-sampling repeater jammingthe generation mechanism of false targets is analyzed.Based on thisand inspired by time domain correlation and frequency domain correlationan interrupted-sampling repeater jamming suppression algorithm based on fractional order correlation is designed and proposed.The algorithm takes the interfered echo in a coherent processing interval as the processing objectand changes the fast time position distribution of false targets by performing different fractional correlation processing on echoes with different repetition periodsand achieves the purpose of jamming suppression through coherent integration.Simulation results show that the proposed algorithm has certain suppression efficiency for interrupted-sampling repeater jamming.After suppressionthe critical Jamming-to-Signal Ratio(JSR)for effective detection of real targets is increased by about 25 dBand the suppression rate of false targets is more than 50%.