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阻抗估计
相关语句
  impedance estimation
     Wave impedance estimation using self-adaptive filtering
     自适应滤波法波阻抗估计
短句来源
     Impedance estimation based on function mapping model
     基于函数映射模型的波阻抗估计
短句来源
     A coronary artery impedance estimation system and its clinical application
     冠状动脉血管阻抗估计系统及其临床应用
短句来源
     The paper describes the principle of wave impedance estimation using self-adap-tive filtering.
     本文介绍了自适应滤波法波阻抗估计的基本原理。
短句来源
  “阻抗估计”译为未确定词的双语例句
     PC-based Resistance Estimation for the Coronary Artery
     基于PC机的冠状动脉血管阻抗估计
短句来源
     Applications of Complex Wavelets in Assessing Harmonic Impedance
     复小波在谐波阻抗估计中的应用
短句来源
     Assessing harmonic impedance by synchronously delaminated distortion waves based on wavelet
     基于小波的畸变波形同步分层谐波阻抗估计
短句来源
     Assessing Harmonic Impedance for Unbalanced Three-Phase Power System on the Basis of Recorded Data
     基于实测的三相不对称电力系统谐波阻抗估计
短句来源
     But the conventional estimation of impedence is performed by means of self-correlation power spectrum biased estimation.
     而常规阻抗估计用自功率谱有偏估计途径。
短句来源
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  相似匹配句对
     b) a G-M estimator of ω'1α, ω'2β and ω'1α+ω'2β under L (Xβ, Aα; δ21V, δ22U} respectively.
     b)G-M估计
短句来源
     Wave impedance estimation using self-adaptive filtering
     自适应滤波法波阻抗估计
短句来源
     Estimation of regular parameters for the impedance inversion
     波阻抗反演正则参数估计
短句来源
     A newmethod for the estimation of exponent regularity of the kind wavelet and related scalefunction is proposed.
     Daubechies的估计
短句来源
     Impedance Matching on Transmission Line
     传输线的阻抗控制
短句来源
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  impedance estimation
The accuracy of the impedance estimation method is validated with a mechanical spring-mass system with known parameters.
      
Bioelectrical impedance estimation of total body water is better than the current existing non-invasive method of skinfold anthropometry.
      
Pressure and flow signals due to breathing contaminate the excitation signals, leading to a poor signal-to-noise ratio (SNR) and thus to errors in impedance estimation, especially at low frequencies (up to 8 Hz).
      
Its nonlinear nature can introduce artifacts that coincide with the frequencies applied to excite the respiratory system, limiting the accuracy of the impedance estimation.
      
H∞ approximation with point constraints applied to impedance estimation
      


The impedence function Z (f) in MTS is fitted in the codition for Hilbert transform. But the conventional estimation of impedence is performed by means of self-correlation power spectrum biased estimation. When the uabiased estimation of power spectrum phase is entirely used, i. e, direct estimation of tensor impedence by Hilbert filter instantaneous spectral analysis, the theoretical derivation can entirely eliminate the distortion found in conventional estimation of tensor impedence. Before recursive filtering,the...

The impedence function Z (f) in MTS is fitted in the codition for Hilbert transform. But the conventional estimation of impedence is performed by means of self-correlation power spectrum biased estimation. When the uabiased estimation of power spectrum phase is entirely used, i. e, direct estimation of tensor impedence by Hilbert filter instantaneous spectral analysis, the theoretical derivation can entirely eliminate the distortion found in conventional estimation of tensor impedence. Before recursive filtering,the stability and the root bz of polynomial B(Z) which is closely related with error are exponentially attenuate, but the new derivative root of B (Z) is more far away from unit circle than original root of B (Z). The result of real processing indicates that the density of point on apperent-resistivity curve and CP values increase to some values extent.

大地电磁测深中阻抗Z(f)满足希尔伯特变换条件。而常规阻抗估计用自功率谱有偏估计途径。当完全利用无偏功率谱相位估计,即通过希氏滤波瞬时谱分析直接估计张量阻抗时,理论推算可完全消除常规张量阻抗估计所导致的偏畸。逆归滤波前对其稳定性及误差密切相关的多项式B(z)的根b_z作指数衰减,而新导出的(?)(z)比原(?)(z)根远离单位圆。实际处理结果表明,其视电阻率曲线点值密集度及cp值均有所提高。

The paper describes the principle of wave impedance estimation using self-adap-tive filtering. It is demonstrated that under a presumption of small reflection coeffi-cients there exists an approximate linear mapping relationship between logarithmicwave impedance and seismic trace, the linear mapping being achieved by using theself-adaptive filtering of signal analysis theory. Synthetic and real data results showthat the method can produce the acoustic impedance (or interval velocity) sectionswhich have much...

The paper describes the principle of wave impedance estimation using self-adap-tive filtering. It is demonstrated that under a presumption of small reflection coeffi-cients there exists an approximate linear mapping relationship between logarithmicwave impedance and seismic trace, the linear mapping being achieved by using theself-adaptive filtering of signal analysis theory. Synthetic and real data results showthat the method can produce the acoustic impedance (or interval velocity) sectionswhich have much higher resolution than those created by usual inversion methods,and that borehole-side seismic trace exhibits nearly the same resolution as loggingdata have- Hence the method can be used as an auxiliary means for the inversionwith logging data restriction.

本文介绍了自适应滤波法波阻抗估计的基本原理。在小反射系数的假设条件下,推证了对数波阻抗与地震道之间近似为线性映射关系,并指出这种映射可应用信号分析理论中的自适应滤波方法来实现。合成记录与实际资料的试算结果表明,该方法能够提供分辨率明显高于常规反演方法的声阻抗或层速度剖面,井旁地震道已能接近测井曲线的分辨率。因此,该方法可作为测井约束反演的补充手段。

Based on three models of the arterial system, including the transmission line mo del, the three element Windkessel model and the single tube complex load model, five algorithms for estimating arterial characteristic impedance are discussed. Theoretical analysis and experimental data show that the direct frequency domain algorithms are reasonable when the modulus and phase of input impedance are smooth above a certain frequency, otherwise results...

Based on three models of the arterial system, including the transmission line mo del, the three element Windkessel model and the single tube complex load model, five algorithms for estimating arterial characteristic impedance are discussed. Theoretical analysis and experimental data show that the direct frequency domain algorithms are reasonable when the modulus and phase of input impedance are smooth above a certain frequency, otherwise results of estimation in different frequency ranges may be much different. The direct time domain algorithm neglects the backward wave during early systole, thus results in an understimate of characteristic impedance. The model parameters optimum algorithms depend on model validity. Model parameters are not fully consistent with the physiological meanings because of model structure errors. The single tube complex load model, compared to the three element Windkessel model, takes into account the transmission and reflection of pressure and flow waves in the proximal aorta, hence is more suitable for characteristic impedance estimation.

考察了不同模型下不同方法对特性阻抗的估计.理论分析与计算结果表明:直接频域估计算法,适用于输入阻抗在某一频率以上呈现模值与相位基本平坦的情况,否则,频率范围不同,将导致估计结果差异很大.直接时域估计算法,导致对特性阻抗的低估.模型参数优化估计算法,估计结果依赖于模型结构与真实系统的近似程度,与三元Windkessel模型相比,单管复负载模型更适于进行特性阻抗的估计

 
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