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小波包变换音频干扰抑制的改进方法

Improved Narrowband Jamming Suppression Methods with Wavelet Packet Transform
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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。 To enhance DS/FH TT&C systems anti-jamming capacity,wavelet packet transform (WPT) based narrowband jamming (NBJ) suppression methods (SM) are studied.According to the problem that the NBJ SM based on adaptive WPT is sensitive to jamming frequency,the improved method with double judgement strategy is put forward.By judging simultaneously the energy compaction measures of the father node and the two child nodes,the proposed method reduces misjudgement ratio in the decomposition process,and improves the performance of jamming suppression.In addition,considering that the shift undecimated WPTl (SUWPT) SM is not able to counter multiple NBJs,adaptive SUWPT SM is proposed,which adopts tree structure decomposition algorithm so as to track multiple NBJs effectively.Simulation results show that the improved adaptive WPT SM solves the problem of being sensitive to jamming frequency,and adaptive SUWPT SM is able to suppress multiple NBJs.
出处 《信号处理》 CSCD 北大核心 2014年第2期243-252,共10页 Journal of Signal Processing
关键词 扩频测控 小波包变换 干扰抑制 相关特性 Spread Spectrum TT&C Wavelet packet transform Jamming suppression Correlation properties
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