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基于表面等等离波子的新型Y分支波导 被引量:9
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作者 赵华伟 黄旭光 苏辉 《光学学报》 EI CAS CSCD 北大核心 2007年第9期1649-1652,共4页
新型高效的纳米光波导器件的研制纳米集成光学的核心技术之一。Y分支波导作为最基本的分光和光路连接元件是纳米光学器件设计与制备的基础。运用时域有限差分(FDTD)法,模拟计算了基于表面等等离波子(SPP)的纳米Y分支波导的传输特性。结... 新型高效的纳米光波导器件的研制纳米集成光学的核心技术之一。Y分支波导作为最基本的分光和光路连接元件是纳米光学器件设计与制备的基础。运用时域有限差分(FDTD)法,模拟计算了基于表面等等离波子(SPP)的纳米Y分支波导的传输特性。结果表明,该新型Y分支波导在光通信波段可以实现大角度的分光功能,且在180°分支情况下,传输效率仍高达92.8%以上。另外,该波导还具有导波性能良好、对分叉处间隙缺陷大小不敏感及制作容差较大和器件尺寸在纳米量级等特点。对该新型光波导器件的研究为未来纳米集成光学器件的研制和应用有一定的指导意义。 展开更多
关键词 纳米集成光学 Y分支 有限时域差分理论 表面准等离波
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地表水微囊藻毒素的表面等离波子共振免疫检测方法研究 被引量:3
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作者 王晓萍 詹舒越 +1 位作者 罗昭锋 周宏敏 《光学学报》 EI CAS CSCD 北大核心 2012年第2期143-148,共6页
结合表面等离波子共振(SPR)技术与免疫检测技术,研究和建立了一种响应速度快、免标记、低成本的地表水微囊藻毒素(MC-LR)检测方法。基于SpreetaTM传感器构建了小型SPR免疫检测系统,采用共价偶联方法在传感器金膜表面修饰MC-LR-BSA抗原... 结合表面等离波子共振(SPR)技术与免疫检测技术,研究和建立了一种响应速度快、免标记、低成本的地表水微囊藻毒素(MC-LR)检测方法。基于SpreetaTM传感器构建了小型SPR免疫检测系统,采用共价偶联方法在传感器金膜表面修饰MC-LR-BSA抗原为生物敏感膜;开展了MC-LR的SPR免疫检测方法实验研究,结果表明该方法的相对标准偏差为1.0%(n=6),定量范围为2~32ng/mL,检测限为0.63ng/mL,半抑制浓度CI50为10.7ng/mL,空白加标回收率和样品加标回收率在90%~113%之间。实样检测实验中,管道末梢饮用自来水水样未能检测出MC-LR,而某湖水水样中MC-LR的质量浓度为2.46ng/mL。实验研究与结果表明,MC-LR的SPR免疫检测方法可以满足世界卫生组织(WHO)对于饮用水中MC-LR最低含量检测的需求。 展开更多
关键词 测量 表面等离波子共振 水质检测 微囊藻毒素MC-LR 免疫检测方法
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非直达波条件下的TDD高精度移动定位算法 被引量:3
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作者 刘申建 万群 彭应宁 《电子学报》 EI CAS CSCD 北大核心 2002年第9期1288-1291,共4页
本文基于单次散射双向移动信道模型及信道参数联合估计,利用单基站测得的多条散射路径的到达时延、到达方向和离波方向进行定位,提出了一种非直达波条件下的TDD高精度移动定位算法 随后分析了其定位误差的分布特性。仿真结果验证了非直... 本文基于单次散射双向移动信道模型及信道参数联合估计,利用单基站测得的多条散射路径的到达时延、到达方向和离波方向进行定位,提出了一种非直达波条件下的TDD高精度移动定位算法 随后分析了其定位误差的分布特性。仿真结果验证了非直达波条件下该算法的有效性. 展开更多
关键词 TDD 非直达 单次散射 离波 移动定位 移动通信
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直立式防波堤的可靠度分析 被引量:8
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作者 谢世楞 刘颖 《港工技术》 1989年第3期1-8,共8页
在不规则波浪力试验和统计分析的基础上;本文探讨了直立式防波堤的可靠性设计方法.首先利用直立堤不规则波浪力的试验资料,得出了可用于可靠度分析的波浪力计算公式,以及相应的不定性系数.然后,由特定地点的波浪观测资料,可算出作用在... 在不规则波浪力试验和统计分析的基础上;本文探讨了直立式防波堤的可靠性设计方法.首先利用直立堤不规则波浪力的试验资料,得出了可用于可靠度分析的波浪力计算公式,以及相应的不定性系数.然后,由特定地点的波浪观测资料,可算出作用在直立堤上的年最大波浪力系列,进而得出波浪力的长期分布概型,对我国南、北五个地点以及明、暗基床两种堤型波浪力的频率分析结果表明,对数-正态曲线和极值Ⅰ型曲线可用来描述波浪力的长期分布.对于典型的明、暗基床直立堤进行了可靠度分析,得出了可靠指标β与常规设计方法安全系数K间的对应关系. 展开更多
关键词 离波 直立式 可靠度
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Diffraction separation by plane-wave prediction filtering 被引量:6
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作者 孔雪 王德营 +2 位作者 李振春 张瑞香 胡秋媛 《Applied Geophysics》 SCIE CSCD 2017年第3期399-405,461,共8页
Seismic data processing typically deals with seismic wave reflections and neglects wave diffraction that affect the resolution. As a general rule, wave diffractions are treated as noise in seismic data processing. How... Seismic data processing typically deals with seismic wave reflections and neglects wave diffraction that affect the resolution. As a general rule, wave diffractions are treated as noise in seismic data processing. However, wave diffractions generally originate from geological structures, such as fractures, karst caves, and faults. The wave diffraction energy is much weaker than that of the reflections. Therefore, even if wave diffractions can be traced back to their origin, their energy is masked by that of the reflections. Separating and imaging diffractions and reflections can improve the imaging accuracy of diffractive targets. Based on the geometrical differences between reflections and diffractions on the plane-wave record; that is, reflections are quasi-linear and diffractions are quasi-hyperbolic, we use plane-wave prediction fltering to separate the wave diffractions. First, we estimate the local slope of the seismic event using plane- wave destruction filtering and, then, we predict and extract the wave reflections based on the local slope. Thus, we obtain the diffracted wavefield by directly subtracting the reflected wavefield from the entire wavefield. Finally, we image the diffracted wavefield and obtain high-resolution diffractive target results. 2D SEG salt model data suggest that the plane-wave prediction filtering eliminates the phase reversal in the plane-wave destruction filtering and maintains the original wavefield phase, improving the accuracy of imaging heterogeneous objects. 展开更多
关键词 Plane wave prediction filter SEPARATION DIFFRACTION
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Triterpenes and Other Constituents from Rhaponticum uniflorum 被引量:1
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作者 张永红 王文 +1 位作者 汪涛 汪汉卿 《Journal of Chinese Pharmaceutical Sciences》 CAS 2001年第3期113-114,共2页
From the roots of Rhaponticum uniflorum a new triterpene was isolated together with ursolic acid(2), 3-oxo-19a-hydroxyurs-12-en-28-oic acid (3), pomolic acid (4), 2a,3a,19a-trihydroxyurs-12-en-28-oic acid (5), arctic ... From the roots of Rhaponticum uniflorum a new triterpene was isolated together with ursolic acid(2), 3-oxo-19a-hydroxyurs-12-en-28-oic acid (3), pomolic acid (4), 2a,3a,19a-trihydroxyurs-12-en-28-oic acid (5), arctic acid (6), catechin (7) and b-sitosterol (8). The structure of the new compound was elucidated as 2a,3a,19a,25-tetrahydroxyurs-12-en-23,28-dioic acid (1) on the basis of spectral and chemical methods. 展开更多
关键词 Rhaponticum uniflorum COMPOSITAE Ttriterpene
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Ground-roll separation of seismic data based on morphological component analysis in twodimensional domain 被引量:2
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作者 徐小红 屈光中 +2 位作者 张洋 毕云云 汪金菊 《Applied Geophysics》 SCIE CSCD 2016年第1期116-126,220,共12页
Ground roll is an interference wave that severely degrades the signal-to-noise ratio of seismic data and affects its subsequent processing and interpretation.In this study,according to differences in morphological cha... Ground roll is an interference wave that severely degrades the signal-to-noise ratio of seismic data and affects its subsequent processing and interpretation.In this study,according to differences in morphological characteristics between ground roll and reflected waves,we use morphological component analysis based on two-dimensional dictionaries to separate ground roll and reflected waves.Because ground roll is characterized by lowfrequency,low-velocity,and dispersion,we select two-dimensional undecimated discrete wavelet transform as a sparse representation dictionary of ground roll.Because of a strong local correlation of the reflected wave,we select two-dimensional local discrete cosine transform as the sparse representation dictionary of reflected waves.A sparse representation model of seismic data is constructed based on a two-dimensional joint dictionary then a block coordinate relaxation algorithm is used to solve the model and decompose seismic record into reflected wave part and ground roll part.The good effects for the synthetic seismic data and application of real seismic data indicate that when using the model,strong-energy ground roll is considerably suppressed and the waveform of the reflected wave is effectively protected. 展开更多
关键词 Ground-roll suppression morphological component analysis sparse representation two-dimensional undecimated discrete wavelet transform two-dimensional local discrete cosine transform
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A normalized wavefield separation cross-correlation imaging condition for reverse time migration based on Poynting vector 被引量:15
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作者 陈婷 何兵寿 《Applied Geophysics》 SCIE CSCD 2014年第2期158-166,253,共10页
Prestack reverse time migration(PSTM) is a common imaging method; however low-frequency noises reduce the structural imaging precision. Thus, the suppression of migration noises must be considered. The generation me... Prestack reverse time migration(PSTM) is a common imaging method; however low-frequency noises reduce the structural imaging precision. Thus, the suppression of migration noises must be considered. The generation mechanism of low-frequency noises is analyzed and the up-, down-, left-, and right-going waves are separated using the Poynting vector of the acoustic wave equation. The computational complexity and memory capacitance of the proposed method are far smaller than that required when using the conventional separation algorithm of 2D Fourier transform. The normalized wavefield separation crosscorrelation imaging condition is used to suppress low-frequency noises in reverse time migration and improve the imaging precision. Numerical experiments using the Marmousi model are performed and the results show that the up-, down-, left-, and right-going waves are well separated in the continuation of the wavefield using the Poynting vector. We compared the imaging results with the conventional method, Laplacian filtering, and wavefield separation with the 2D Fourier transform. The comparison shows that the migration noises are well suppressed using the normalized wavefield separation cross-correlation imaging condition and higher precision imaging results are obtained. 展开更多
关键词 acoustic wave equation Poynting vector wavefield separation normalized crosscorrelation migration noises
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Separation of Ions from Volatile Organic Compounds Using High-Field Asymmetric Waveform Ion Mobility Spectrometry-Mass Spectrometer 被引量:2
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作者 李华 王晓浩 +2 位作者 唐飞 杨吉 丁力 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第2期125-132,I0001,共9页
A combination of high-field asymmetric waveform ion mobility spectrometry (FAIMS) with mass spectrometer (MS) was analyzed. FAIMS separates ions from the volatile organic compounds in the gas-phase as an ion-filte... A combination of high-field asymmetric waveform ion mobility spectrometry (FAIMS) with mass spectrometer (MS) was analyzed. FAIMS separates ions from the volatile organic compounds in the gas-phase as an ion-filter for MS. The sample ions were created at ambient pressure by ion source, which was equipped with a 10.6 eV UV discharge lamp (A=116.5 nm). The drift tube of FAIMS is composed of two parallel planar electrodes and the dimension is 10 mm×8 mm×0.5 mm. FAIMS was investigated when driven by the high-filed rectangular asymmetric waveform with the peak-to-peak voltage of 1.36 kV at the frequency of 1 MHz and the duty cycle of 30%. The acetone, the butanone, and their mixture were adopted to characterize the FAIMS-MS. The mass spectra obtained from MS illustrate that there are ion-molecular reactions between the ions and the sample neutral molecular. And the proton transfer behavior in the mixture of the acetone and the butanone is also observed. With the compensation voltage tuned from -30 V to 10 V with a step size of 0.1 V, the ion pre-separation before MS is realized. 展开更多
关键词 High-field asymmetric waveform ion mobility spectrometry Mass spectrometer Ion-filter Ion-molecular reaction Proton transfer
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Separation method for multi-source blended seismic data
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作者 王汉闯 陈生昌 +1 位作者 张博 佘德平 《Applied Geophysics》 SCIE CSCD 2013年第3期251-264,357,共15页
Multi-source seismic technology is an efficient seismic acquisition method that requires a group of blended seismic data to be separated into single-source seismic data for subsequent processing. The separation of ble... Multi-source seismic technology is an efficient seismic acquisition method that requires a group of blended seismic data to be separated into single-source seismic data for subsequent processing. The separation of blended seismic data is a linear inverse problem. According to the relationship between the shooting number and the simultaneous source number of the acquisition system, this separation of blended seismic data is divided into an easily determined or overdetermined linear inverse problem and an underdetermined linear inverse problem that is difficult to solve. For the latter, this paper presents an optimization method that imposes the sparsity constraint on wavefields to construct the object function of inversion, and the problem is solved by using the iterative thresholding method. For the most extremely underdetermined separation problem with single-shooting and multiple sources, this paper presents a method of pseudo-deblending with random noise filtering. In this method, approximate common shot gathers are received through the pseudo-deblending process, and the random noises that appear when the approximate common shot gathers are sorted into common receiver gathers are eliminated through filtering methods. The separation methods proposed in this paper are applied to three types of numerical simulation data, including pure data without noise, data with random noise, and data with linear regular noise to obtain satisfactory results. The noise suppression effects of these methods are sufficient, particularly with single-shooting blended seismic data, which verifies the effectiveness of the proposed methods. 展开更多
关键词 MULTI-SOURCE data separation linear inverse problem sparsest constraint pseudo-deblending filtering
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EXPERIMENTAL STUDY OF FORCED SHOCK TRAIN OSCILLATION IN ISOLATOR UNDER ASYMMETRIC INCOMING FLOW 被引量:3
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作者 曹学斌 张堃元 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2011年第1期73-80,共8页
To analyze the response of the wall pressure fluctuation in an isolator when the shock train is subjected to a periodic motion at a low frequency,the isolator experiment is conducted in a blow-down supersonic wind tun... To analyze the response of the wall pressure fluctuation in an isolator when the shock train is subjected to a periodic motion at a low frequency,the isolator experiment is conducted in a blow-down supersonic wind tunnel at free stream Mach number of 1.98 under asymmetric incoming flow.Experimental results show that:The isolator effectively isolates the periodic back pressure fluctuation from affecting upstream undisturbed flow;The wall pressure fluctuations are due to the propagation of wave fronts with the second acoustic mode,but they are subjected to an oscillating shock train in the most part of the shock oscillation region;The attenuation of wall pressure fluctuations on the lower wall with thick boundary layer accords with the exponential law,but it fluctuates on the upper wall with thin boundary layer in the shock oscillation region. 展开更多
关键词 engines shock waves pressure distribution ISOLATOR
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Separation of inhomogeneous blended seismic data 被引量:2
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作者 刘强 韩立国 +2 位作者 陈竞一 陈雪 张显娜 《Applied Geophysics》 SCIE CSCD 2015年第3期327-333,466,共8页
The frequencies of sources involved m conventional blended acquisition are the same. Each source transmits the full frequency band, and in general, significant effort is required to successfully produce and operate wi... The frequencies of sources involved m conventional blended acquisition are the same. Each source transmits the full frequency band, and in general, significant effort is required to successfully produce and operate wideband sources. To solve this problem, inhomogeneous blended or decentralized blended acquisition is used, in which the dominant frequency and bandwidth of the source units in a blended array are not equal. When the inhomogeneous and conventional blending acquisitions adopt the same geometry and separation methods, the former has low signal-to-blending noise ratio. Therefore, we present a new separation method for such blended acquisition based on the synchrosqueezed wavelet transform. The proposed method offers better separation quality and decreases the computation time to approximately 1/3. 展开更多
关键词 Inhomogeneous blended acquisition synchrosqueezed wavelet transform deblending
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EFFECTS OF INCOMING FLOW ASYMMETRY ON SHOCK TRAIN STRUCTURES IN CONSTANT-AREA ISOLATORS 被引量:2
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作者 王成鹏 张堃元 程克明 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第1期1-7,共7页
To simulate the actual flowfield at the exit of the supersonic/hypersonic inlet, a wind tunnel is designed to study the flow in the scramjet isolator under the asymmetric incoming flow. And compression fields in the i... To simulate the actual flowfield at the exit of the supersonic/hypersonic inlet, a wind tunnel is designed to study the flow in the scramjet isolator under the asymmetric incoming flow. And compression fields in the isolator are investigated using wall static and pitot pressure measurements. Three incoming Mach numbers are considered as 1.5, 1.8 and 2. Results show that the increase of the asymmetry of the flow at the isolator entrance leads to the increase of the shock train length in the isolator for a given pressure ratio. Based on the analysis of the flow asymmetry effect at the isolator entrance on the shock train length, a modified correlation is proposed to calculate the length of the shock train. Predicted results of the proposed correlation are in good agreement with the experimental data. 展开更多
关键词 asymmetric supersonic flow shock train isolator design SCRAMJET wind tunnel test
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VLSI Implementation of a Wavelet Image Coder
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作者 乔世杰 王国裕 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2002年第7期695-700,共6页
A modular architecture for two dimension (2 D) discrete wavelet transform (DWT) is designed.The image data can be wavelet transformed in real time,and the structure can be easily scaled up to higher levels of DWT.A f... A modular architecture for two dimension (2 D) discrete wavelet transform (DWT) is designed.The image data can be wavelet transformed in real time,and the structure can be easily scaled up to higher levels of DWT.A fast zerotree image coding (FZIC) algorithm is proposed by using a simple sequential scan order and two flag maps.The VLSI structure for FZIC is then presented.By combining 2 D DWT and FZIC,a wavelet image coder is finally designed.The coder is programmed,simulated,synthesized,and successfully verified by ALTERA CPLD. 展开更多
关键词 discrete wavelet transform zerotree image coding VLSI Verilog HDL CPLD
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Overlapped peaks resolution for linear sweep polarography using Gaussian-like distribution 被引量:2
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作者 朱红求 王国伟 +2 位作者 阳春华 曹宇 桂卫华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2181-2186,共6页
A resolution method based on Gaussian-like distribution for overlapped linear sweep polarographic peaks was proposed to simultaneously detect the polymetallic components, such as Zn(Ⅱ) and Co(Ⅱ), coexisting in t... A resolution method based on Gaussian-like distribution for overlapped linear sweep polarographic peaks was proposed to simultaneously detect the polymetallic components, such as Zn(Ⅱ) and Co(Ⅱ), coexisting in the leaching solution of zinc hydrometallurgy. A Gaussian-like distribution was constructed as the sub-model of overlapped peaks by analyzing the characteristics of linear sweep polarographic curve. Then, the abscissas of each peak and trough were pinpointed through multi-resolution wavelet decomposition, the curve and its derivative curves were fitted by using nonlinear weighted least squares (NWLS). Finally, overlapped peaks were resolved into independent sub-peaks based on fitted reconstruction parameters. The experimental results show that the relative error of half-wave potential pinpointed by multi-resolution wavelet decomposition is less than 1% and the accuracy of Ip fitted by NWLS is higher than 96%. The proposed resolution method is effective for overlapped linear sweep polarographic peaks of Zn(Ⅱ) and Co(Ⅱ). 展开更多
关键词 zinc hydrometallurgy Gaussian-like distribution overlapped peaks resolution multi-resolution wavelet decomposition nonlinear weighted least squares fitting
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PLASMA RESONANCE FIBER OPTIC SENSOR FOR CURE MONITORING OF EPOXY COMPOSITE
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作者 邱浩 梁大开 +1 位作者 张焕春 经亚枝 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2001年第2期182-187,共6页
The plasma resonance fiber optic sensor has a research values in theory and is widely used in engineering because of its simple structure and high sensitivity. It is a simple and sensitive method to measure the refrac... The plasma resonance fiber optic sensor has a research values in theory and is widely used in engineering because of its simple structure and high sensitivity. It is a simple and sensitive method to measure the refractive index with optical fiber plasma wave. We make use of this characteristic to manufacture the plasma resonance fiber optic sensor which can detect the cure of epoxy compo site. We study the method of testing the solutions which have different refractive index with plasma resonance fiber optic sensor. A fiber optic sensing probe which has reliable performance and convenient operation for detecting the refractive index has been designed. The system for detecting the solution refractive index is developed and used to measure the refractive index of epoxy during the different phases in the cure process. Result shows that this system is credible and stable, the parameters tested are in accord with the facts. 展开更多
关键词 plasma wave fiber optic sensor refractive index EPOXY cure detecting
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A VIDEO SPECTRUM SPLITTING ENCODING SCHEME BASED ON HUMAN VISION AND ITS COMPUTER SIMULATION
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作者 赵宇 李华 +1 位作者 俞斯乐 滕建辅 《Transactions of Tianjin University》 EI CAS 1995年第1期79+76-79,共5页
In this paper, a 3-D video encoding scheme suitable for digital TV/HDTV (high definition television) is studied through computer simulation. The encoding scheme is designed to provide a good match to human vision. Bas... In this paper, a 3-D video encoding scheme suitable for digital TV/HDTV (high definition television) is studied through computer simulation. The encoding scheme is designed to provide a good match to human vision. Basically, this involves transmission of low frequency luminance information at full frame rate for good motion rendition and transmission of high frequency luminance signal at reduced frame rate for good detail in static images. 展开更多
关键词 D video encoding discrete wavelet transform human vision computer simulation
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The Determination of Heavy Metal Elements in Honey by MWD-ICP-AES 被引量:3
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作者 陈文 王湘君 +5 位作者 赵阳 苏利兴 张哲 莫兰发 欧阳敏 黄梁 《Agricultural Science & Technology》 CAS 2014年第6期890-894,共5页
In order to build method for measuring of elements in honey, the contents of Ba, Cu, Pb, Cd, As, Hg, Cr, Mn, Se had been determined by microwave diges- tion (MWD) and actively coupled plasma atomic emission spectrom... In order to build method for measuring of elements in honey, the contents of Ba, Cu, Pb, Cd, As, Hg, Cr, Mn, Se had been determined by microwave diges- tion (MWD) and actively coupled plasma atomic emission spectrometry (ICP-AES). The results show that, the range of heavy metal elements were in the range of 0- 10.0 mg/L, with good linear relationship. In addition, all correlation coefficients kept higher than 0.999, and the recovery rate of ample added with standard solution was in 94.1%-110%. By comparison with the result of chemical experiment, the method was quickly accessible and convenient, widely used in the measurement of elements in honey, with satisfactory results. 展开更多
关键词 HONEY ICP-AES MWD ELEMENT
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CENTRIFUGAL TEST STUDY ON THE BEHAVIOR OF SOFT CLAY AT SEA BOTTOM UNDER THE ACTION OF WAVE FORCE 被引量:1
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作者 闫澍旺 李飒 邓卫东 《Transactions of Tianjin University》 EI CAS 1999年第2期104-108,共5页
The importance of studying the behavior of the soil at the sea bottom under the action of wave force has arisen with the development of offshore engineering.In this paper,the behavior of the soft clay under the action... The importance of studying the behavior of the soil at the sea bottom under the action of wave force has arisen with the development of offshore engineering.In this paper,the behavior of the soft clay under the action of wave forces is studied by performing centrifugal tests.The soil profile and the wave characters were simulated in the centrifugal model cell according to the typical environmental conditions of the oil fields in the Bohai gulf.Test results show that the soft clay layer will be seriously softened near the upper surface under the maximum wave height and slightly affected in the deeper layer,and that no liquefaction was recorded in the silty sand sublayer during the test.It is proven that the centrifugal test is a valid technique for simulating the interaction between soil and wave. 展开更多
关键词 wave soft clay SOFTENING centrifugal model test
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An Improved Multi-scale Estimation Method of Signal
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作者 胡长流 文成林 《Chinese Quarterly Journal of Mathematics》 CSCD 2000年第2期102-107,共6页
In this paper an improved multi_scale estimation method of signal is gaven.The detail signals on each scale are further more decomposed with wavelet transform.The subdetail signals and subsmoothing signals are process... In this paper an improved multi_scale estimation method of signal is gaven.The detail signals on each scale are further more decomposed with wavelet transform.The subdetail signals and subsmoothing signals are processed with different threshold respectively. The smoothing signals on the coarsest scale are processed with Kalman fitering and reconstructed with the detail signal on each scale.At last the signal estimate value on the original scale is obtained. 展开更多
关键词 multi_scale analysis discrete wavelet transform Kalman filtering
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