【作者】 章兰英； 袁嗣杰； 陈源；

【Author】 ZHANG Lanying,YUAN Sijie,CHEN Yuan TT&C Research Center,the Academy of Equipment Command & Technology,Beijing 101416,China

【机构】 装备指挥技术学院测控工程研究中心；

【摘要】 提出一种小波包变换和频移相结合的窄带干扰抑制的算法。该算法首先通过频移将窄带干扰集中至子带中间,然后对信号进行小波包分解,通过子带功率比准则将窄带干扰滤除,最后在重构信号前,通过阈值法对信号进行去噪处理,以适应低信噪比下直扩信号的捕获。理论分析和仿真结果表明,采用频移小波包变换可以更彻底地抑制干扰,同时通过阈值法对噪声进行滤除,可以改善信号的信噪比,减少捕获时系统的单次驻留时间,提高捕获性能。更多还原

【Abstract】 A narrowband interference suppression algorithm which combined wavelet packet transform with frequency shift is proposed.It first centers the interference in a subband by frequency shift.Then,the signal is decomposed by wavelet packet transform,and interference is suppressed under subband power ratio rule.Finally,the signal is de-noised using soft thresholding before signal reconstructed.Both analysis and simulation demonstrate that the interference is completely suppressed by frequency shift wavelet packet transform,the signal-to-noise ratio is improved by signal de-noising using soft thresholding,the single dwell time of acquisition is reduced and the acquisition performance is improved.更多还原