宽带压制性干扰是直接序列扩频系统面临的主要干扰威胁之一，对宽带干扰样式的识别与参数估计可为直扩通信双方采取有针对性的抗干扰措施提供有益参考。针对直扩系统常见的宽带干扰类型，通过提取5个特征参数值，提出了一种基于分数阶Fourier变换和分层决策分类算法的宽带干扰样式自动识别方法，并给出了仿真结果及其分析。仿真结果表明，该方法可以有效识别无干扰、窄带干扰、宽带噪声干扰、宽带梳状谱干扰和宽带线扫频干扰情况，具有识别率高、算法简单、信号采样时长短、稳定性和鲁棒性好等优点。%Wide-band suppressing jamming is one of the main threats faced by Direct Sequence Spread Spectrum (DSSS) system.The identification of wide-band jamming modes and estimation of its parameters may provide a beneficial reference for implementing effective anti-jamming measures.Aiming at the common wide-band jamming modes faced by DSSS,five characteristic parameters are extracted .An automatic identification method of wide-band jamming modes was proposed based on Fractional Fourier Transform ( FRFT) and hierarchical decision-making algorithm .The simulation result and its analysis are given,which shows that:1 ) this method can effectively identify non-jamming,narrow-band jamming,wide-band noise jamming,wide-band comb jamming and wide-band sweep jamming; and 2 ) it has the advantages of high identification rate,simple algorithm,short sample time,fine stability and robustness,etc.
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