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IntroductionMultiparameterinversescatteringforelasticmediumisafoundationalprobleminseismologyandnondestructivetesting .WithintheBornapproximation ,thisproblemhasbeeninvestigatedbyseveralauthors.Blackledgeetal.[1]haveextendedtheX_raytomographyschemetothed… 相似文献
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A Loop-Shift Stop & Go Adaptive Filter(LSSGAF) with applications in period detection and signal separation of overlapped periodic signals is presented. The filter places no constraints on the overlapped forms in frequency domain and requires no priori knowledge except for approximate period range of signals to be separated, therefore it provides for an efficient and feasible method to separate periodic signals overlapped both in time and frequency domains. The convergence conditions of the filter and the requirements of all parameter selections are discussed, meanwhile a rough scanning and channel auto-shut algorithm is proposed to reduce the amount of calculation in the searching stage. Experiments show that the filter can separate all kinds of overlapped periodic signals with different initial phases and different relative magnitudes. 相似文献
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本文提出了一种适用于交叠周期信号的周期检测和信号分离的环移Stop&Go(S&G,停止-进行)自适应数字滤波器。该滤波器对周期信号在频域的交叠程度没有任何要求。除假设已知要分离的周期信号的周期的大致范围外,不需其他先验知识。因而它提供了一种分离时域和频域都互相交叠的周期信号的有效可行的方法。文章从理论上讨论了该滤波器的收敛条件和各参数的选取要求,并提出了一种较实用的粗精度周期搜索和通道自动关闭算法,减少了计算量。实验证明该滤波器对各种不同初始相位、不同相对幅度的周期信号交叠而成的信号均能有效地分离。 相似文献
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在日常教学过程中,若能注意结合教材,选择一些较好的例题或习题,来培养学生的探究能力,不但能提高学生的思维能力和解决问题的能力,而且能激发学生的学习兴趣,为逐步适应解探究性的高考题型作好铺垫。可谓是一举多得。今以解析几何课本P99练习8为例 相似文献
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