一种基于S变换的高频地波雷达瞬态干扰抑制方法

发布时间：2018-01-22 05:15

本文关键词： 高频地波雷达瞬态干扰抑制 S变换 BP神经网络　出处：《电子学报》2014年03期 　论文类型：期刊论文

【摘要】：针对高频地波雷达中出现的瞬态干扰问题,提出了基于S变换(Stockwell transforms)的瞬态干扰抑制方法.首先分析了两次FFT信号处理机制下瞬态干扰的时频特征;然后应用S变换对雷达信号进行时频分析,利用瞬态干扰在时频维扩展性不同的特点,实现瞬态干扰的检测;最后应用三层BP(Back Propagation)神经网络对海洋回波信号进行预测和恢复.该方法避免了海杂波抑制的步骤,具有计算量小、信号损失小的优点.现场实测数据分析表明,该方法能够有效抑制瞬态干扰,使回波多普勒谱信噪比提高达10dB,有效提高了雷达的抗干扰能力.
[Abstract]:Aiming at the transient jamming problem in HF ground wave radar. A method of transient interference suppression based on S-transform Stockwell transforms is proposed. Firstly, the time-frequency characteristics of transient interference under twice FFT signal processing mechanism are analyzed. Then the S-transform is used to analyze the time and frequency of radar signal, and the transient interference detection is realized by using the characteristics of different time-frequency dimension expansibility of transient jamming. Finally, the three-layer BP(Back propagation neural network is used to predict and recover the ocean echo signal. This method avoids the step of sea clutter suppression and has a small computational complexity. Field data analysis shows that the proposed method can effectively suppress transient interference and increase echo Doppler spectrum signal-to-noise ratio to 10 dB, thus effectively improving radar's anti-jamming capability.
【作者单位】：武汉大学电子信息学院;
【基金】：国家自然科学基金(No.60571065) ‘十二五’863计划(No.2012AA091701) 中央高校基本科研业务费专项资金(No.2012212020207)
【分类号】：TN958.93
【正文快照】： x 勒谱噪声基底大幅抬高,将会淹没海洋回波信号和舰船_目标信号,而海态参数提取和目标检测都是基于回波多高频地波雷达利用3~30MHz电波沿海面传播衰普勒谱,因此严重的瞬态干扰将会对雷达探测性能造成减小的特点,能够有效照射海面数百千米范围,实现超灾难性影响.视距探测?高频

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