基于自适应滤波与倒谱联合分析的时延估计方法
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摘要
为了加强倒谱分析方法在窄带信号多途时延估计的抗噪声性能,该文在自适应滤波的基础上,提出了一种基于自适应陷波滤波与波形修正的信号预处理方法。该方法首先对回波信号进行自适应陷波滤波,有效减少噪声分量,然后对输出波形的包络进行调整,恢复信号的边沿信息,在保留信号中信道信息的前提下有效提高输入信噪比。仿真结果证明,该预处理方法提高信噪比效果明显,并不破坏时延分量,与倒谱分析相结合,能够有效提取线谱信号中的信道信息。
In order to strengthen its anti-noise performance when using cepstrum to estimate the multipath time-delay of narrowband signals,a pre-processing method by adaptive Notch filtering and envelop modification is proposed based on the adaptive filtering. This method improves the signal-tonoise ratio( SNR) by adaptive Notch filtering,modifies its envelope and preserves the time-delay information. Simulation results show that this method can improve the SNR effectively and do not destroy the delay component. The channel information can be extracted effectively in combination with the cepstrum method.
In order to strengthen its anti-noise performance when using cepstrum to estimate the multipath time-delay of narrowband signals,a pre-processing method by adaptive Notch filtering and envelop modification is proposed based on the adaptive filtering. This method improves the signal-tonoise ratio( SNR) by adaptive Notch filtering,modifies its envelope and preserves the time-delay information. Simulation results show that this method can improve the SNR effectively and do not destroy the delay component. The channel information can be extracted effectively in combination with the cepstrum method.
引文
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[19]梁国龙,杨春,王德俊.频点自跟踪自适应频率估计器性能研究[J].电子学报,2005,33(7):1204-1208.Liang Guolong,Yang Chun,Wang Dejun.Research on properties of frequency auto-tracking adaptive frequency estimator[J].Journal of Acta Electronica Sinica,2005,33(7):1204-1208.
[2]Mason S,Berger C,Zhou S.Detection,synchronization,and Doppler scale estimation with multicarrier waveforms in underwater acoustic communication[J].IEEE Journal on Selected Areas in Communications,2008,26(9):1638-1649.
[3]Palladini A,Testoni N.A reduced complexity estimation algorithm for ultrasound image de-blurring[J].Computer Methods and Programs in Biomedicine,2009,95(S):S4-S11.
[4]Taxt T,Strand J.Two-dimensional noise-robust blind deconvolution of ultrasound images[J].IEEE Transactions on Ultrasonic,Ferroelectrics and Frequency Control,2001,48(4):861-866.
[5]Dsa A,Kumar A.Realistic ambient noise analysis for passive surveillance algorithm design[A].IEEE Symposium on and 2011 Workshop on Scientific Use of Submarine Cables and Related Technologies[C].Tokyo,Japan:IEEE Computer Society,2011:1-8.
[6]Tloba H,Elgerazwy A.A perceptually based approach for the improvement of automatic identification of naval targets[A].Proceedings of 2nd IEEE International Conference on Computer Science and Information Technology[C].Beijing,China:IEEE Computer Society,2009:263-267.
[7]陆志华,陈励军.基于倒谱的匹配场被动定位研究[J].声学与电子工程,2009(3):4-7.Chen Zhihua,Chen Lijun.The research of passive localization matched field processing with cepstrum[J].Journal of Acoustics and Electronics Engineering,2009(3):4-7.
[8]马元峰,陈克安,马苗.一种新的可应用于声目标识别的倒谱系数[J].兵工学报,2009,30(11):1477-1483.Ma Yuanfeng,Chen Kean,Ma Miao.A new cepstrum coefficients applied to acoustic target recognition[J].Journal of Acta Armamentarll,2009,30(11):1477-1483.
[9]杨德森,时杰,刘伯胜.基于倒谱分析的水声信号被动定位时延估计算法研究[J].系统仿真学报,2009,21(2):610-616.Yang Desen,Shi Jie,Liu Bosheng.Research of timedelay estimation algorithm for passive localization based on cepstrum analysis[J].Journal of System Simulation,2009,21(2):610-616.
[11]殷业,赵松龄,盛胜我.声信号时延的倒谱相关分析[J].同济大学学报,1996,24(6):684-691.Yin Ye,Zhao Songling,Sheng Shengwo.Cepstrum correlation algorithm in time delay estimation[J].Journal of Tongji University,1996,24(6):684-691.
[12]满令斌,陈川.基于倒谱的水下目标被动定位方法[J].水雷战与舰船防护,2010,18(1):49-56.Man Lingbin,Chen Chuan.Research on passive localization of underwater target based on cepstrum[J].Mine Warfare&Ship Self-defence,2010,18(1):49-56.
[13]Chen Lijun,Gao Xiang,An Liang.Multipath passive localization in shallow water channel[J].Journal of Nanjing University(Natural Sciences),2012,48(5):609-615.
[14]梁国龙.回波信号瞬时参数序列分析及其应用研究[D].哈尔滨:哈尔滨工程大学水声工程学院,1997:67-70.
[15]陈川,陈绍华,李琪.基于自适应Notch滤波器的矢量阵多目标分辨研究[J].兵工学报,2011,32(9):1131-1135.Chen Chuan,Chen Shaohua,Li Qi.Multi-sources distinguishing with acoustic vector sensor array based on adaptive notch filter[J].Acta Armamentarii,2011,32(9):1131-1135.
[16]Romoli L,Cecchi S,Peretti P.A mixed decorrelation approach for stereo acoustic echo cancellation based on the estimation of the fundamental frequency[J].IEEE Transactions on Audio,Speech,and Language Processing,2012,20(2):690-698.
[17]周倩,申晓红,张颖峰.自适应Notch滤波器四元平面方阵定向性能[J].计算机仿真,2009,26(9):346-349.Zhou Qian,Shen Xiaohong,Zhang Yingfeng.Directional performance of four-cell-square-array in plane decided by adaptive Notch filter[J].Journal of Computer Simulation,2009,26(9):346-349.
[18]李爽.同态滤波技术在水声信道中的应用[D].哈尔滨:哈尔滨工程大学水声工程学院,2010:31-34.
[19]梁国龙,杨春,王德俊.频点自跟踪自适应频率估计器性能研究[J].电子学报,2005,33(7):1204-1208.Liang Guolong,Yang Chun,Wang Dejun.Research on properties of frequency auto-tracking adaptive frequency estimator[J].Journal of Acta Electronica Sinica,2005,33(7):1204-1208.