小波包变换音频干扰抑制的改进方法

发布时间：2018-03-14 11:20

本文选题：扩频测控　切入点：小波包变换　出处：《信号处理》2014年02期 　论文类型：期刊论文

【摘要】：为进一步提高直扩/跳频测控系统的抗干扰能力,研究了基于小波包变换(WPT)的音频干扰抑制方法。针对自适应WPT干扰抑制方法对干扰频率敏感的问题,提出了基于双重判断策略的改进抑制方法。该方法在分解过程中对父节点及其子节点的聚焦度进行判断,极大地降低了对节点是否继续分解的误判。针对频移非抽取WPT干扰抑制方法不能有效抑制多分量干扰的问题,提出了基于树形分解的改进抑制方法。该方法引入树形结构分解算法,可根据干扰的数量,自适应调整分解树,实现对多分量干扰的跟踪。以音频干扰的研究对象,对两种改进方法进行了仿真验证。仿真结果表明,改进的自适应WPT抑制方法解决了原方法对音频干扰频率敏感的问题,提高了抑制方法的鲁棒性;改进的频移非抽取WPT抑制方法可有效抑制多分量音频干扰。
[Abstract]:In order to further improve the anti-jamming capability of DSSS / FH measurement and control system, an audio interference suppression method based on wavelet packet transform (WPT) is studied. The adaptive WPT interference suppression method is sensitive to the interference frequency. An improved suppression method based on double judgment strategy is proposed, in which the focusing degree of the parent node and its children is judged during the decomposition process. The misjudgment of whether the node continues to decompose is greatly reduced. In view of the problem that the frequency shift undecimated WPT interference suppression method can not effectively suppress the multicomponent interference, In this paper, an improved tree decomposition method based on tree decomposition is proposed, which can adaptively adjust the decomposition tree according to the number of interference, and realize the tracking of multi-component interference. The simulation results show that the improved adaptive WPT suppression method solves the problem that the original method is sensitive to the frequency of audio interference and improves the robustness of the proposed method. The improved frequency shift non-decimation WPT suppression method can effectively suppress multi-component audio interference.
【作者单位】：装备学院测控工程研究中心;装甲兵学院装备运用系;
【分类号】：TN972

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