一种自适应方向性技术在生命探测仪中的应用
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摘要
基于声波/振动探测原理的地震生命探测系统的研制在我国灾害生命搜索救助领域中占有重要位置。提出了一种有效的自适应噪声抵消方法,该方法通过自适应的改变增益值代替改变部分样本的时延值而使系统零点自适应的移动,当信号和噪声同时存在时,能保证零点总是朝向噪声方向。该自适应算法能在硬件中实时实现,在声波/振动生命探测仪中可作为噪声削减和信号增强的实际工具。
The research on the victim location system based on acoustic and seismic wave detection plays an important partin post-earthquake searches and rescues.An effective adaptive directionality technology is proposed in this paper.This adaptive directionality technology is based on an adaptive combination of two fixed polar patterns that act to make the null of the combined polar pattern of the system output always be toward the direction of the noise,and related adaptive algorithms to update this gain are also given.Theoretical analyses demonstrate its effectiveness and high accuracy.
The research on the victim location system based on acoustic and seismic wave detection plays an important partin post-earthquake searches and rescues.An effective adaptive directionality technology is proposed in this paper.This adaptive directionality technology is based on an adaptive combination of two fixed polar patterns that act to make the null of the combined polar pattern of the system output always be toward the direction of the noise,and related adaptive algorithms to update this gain are also given.Theoretical analyses demonstrate its effectiveness and high accuracy.
引文
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[8]Parra L,Spence C.Convolutive blind source separation of non-sta-tionary sources[J].IEEE Trans.Speech Audio Processing,2000,8(3):320-327.
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[2]朱爱军,郭勇.声光一体生命搜索与定位探测仪设计与实现[J].计算机工程与应用,2004,(4):198-200.
[3]陈维锋,彭晋川,等.三种生命探测仪及其在地震救助中的应用[J].四川地震,2003,(3):25-28.
[4]商文忠.数字助听器中方向性技术研究[D].西安:西安电子科技大学,2007.
[5]杨毅,杨宇,余达太.麦克风阵列及其消噪性能研究[J].计算机工程,2006,32(2):193-195.
[6]Valente M.Use of microphone technology to improve user performancein noise[J].Trends Amplificat,1999,4(3):112-135.
[7]Soede W,Berkhout A J,Bilsen F A.Development of a directionalhearing instrument based on array technology[J].Acoust.Soc.A-mer.,1993,94(2):785-798.
[8]Parra L,Spence C.Convolutive blind source separation of non-sta-tionary sources[J].IEEE Trans.Speech Audio Processing,2000,8(3):320-327.
[9]Piersol A G.Time delay estimation using phase data[J].IEEE Transon ASSP,1981,ASSP-29(3):471-477.
[10]Schmidt R O.Multiple Emitter Location and Signal Parameter Esti-mation[J].IEEE Trans.Antennas and Propagation,1986,34(3):276-280.
[11]陆光华,彭学愚,张林让,毛用才.随机信号处理[M].西安:西安电子科技大学出版社,2002.
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