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估计     
相关语句
  estimation
    Information Fusion Estimation Theory and Its Applications to Spacecraft Control
    信息融合估计理论及其在航天器控制中的应用研究
短句来源
    Gravitational Spectrum Analysis and State Estimation Methods for Satellite-to-Satellite Tracking Mission
    卫星跟踪卫星任务的引力谱分析和状态估计方法
短句来源
    Study on Integrated Navigation System Based on Multiscale Estimation Theory
    基于多尺度估计理论的组合导航系统研究
短句来源
    IDENTIFICATION AND ESTIMATION OF THE RANDOM ERROR MODELS FOR INERTIAL ACCELEROMETER AND BARO-ALTIMETER
    惯性加速度计与气压高度计之随机误差模型的辨识与估计
短句来源
    SPIN SATELLITE ATTITUDE DETERMINATION AND SYSTEM BIAS ESTIMATION
    自旋卫星姿态确定和系统偏差估计
短句来源
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  estimate
    Estimate of Critical Probability Occurred in Mandelbrot′s Fractal Percolation
    Mandelbrot分形渗流发生中临界概率数的估计
短句来源
    Research on New Biased Estimate──Principal Elements Sweep Estimate
    新的有偏估计的研究──主扫描估计
短句来源
    Navigation parameters from INS and error angles of platform were chosen as the states of the system,the navigation calculating equations and attitude error equations of INS were the state equations,and navigation parameters from GPS were the measurements. UKF was used to estimate navigation parameters of the integrated system directly.
    以INS输出的导航参数及平台误差角等作为系统状态,惯导力学编排方程和姿态误差方程作为系统状态方程,GPS输出的导航参数作为量测,采用UKF方法对系统导航参数直接进行估计.
短句来源
    Methods An improved 4 parameters inhomogeneous triphasic model based on 3 parameters model was developed to estimate the uniaxial modulus Ha of cartilage and to predict the swelling pattern of cartilage.
    方法本文在3参数三相模型的基础上,提出了非匀质4参数三相模型,用来估计软骨的轴向模量Ha,并预测了关节软骨的膨胀模式。
短句来源
    Conventional subspace based algorithms for DOA evaluation estimate the DOA parameters by tracking either the signal subspace or noise subspace of the covariance matrix of the received signal.
    DOA估计的子空间方法主要是通过估计信号协方差矩阵的信号子空间或者噪声子空间来求出信号的DOA参数。
短句来源
更多       
  estimates
    In this algorithm,each earth station first estimates the carrier frequency offset of the received network management broadcast channel,and then estimates the frequency of the reference source of each station and the LO frequency of satellite transponder,and finally,open loop frequency compensation is added to the transmitter or the receiver to achieve fast synchronization of the communication signal.
    在该算法中,各地球站首先对接收网管广播信道的载波频差进行估计,然后在此基础上估计各站参考源频率及卫星转发器的本振频率,最后再根据估计结果对发射载波频率或收载波频率进行开环补偿,以实现通信信号的快速同步。 数学分析和试用结果表明,该算法可以解决有广播信道的低速突发卫星信号的快捕问题。
短句来源
    Multiple Bayes estimates of the reliability performance for cold standby system
    冷贮备系统可靠性指标的多层 Bayes 估计
短句来源
    Energy Decay Estimates in Steady Navier-Stokes Flow
    稳态N—S流的能量衰减估计
短句来源
    Finally, using the condition of the Stokes projection operator and the discrete LBB condition, optimal error estimates on L 2-norm, energy-norm of velocity and L 2-norm of the pressure are derived.
    最后 ,利用 Stokes投影算子的性质和离散的LBB条件 ,得到了非定常不可压 Stokes方程关于速度 L2 模和能量模及压力 L2 模方面的最优阶误差估计
短句来源
    Existence and error estimates of the approximate solution are established.
    分析了逼近问题的解的存在性并给出了逼近解的误差估计.
短句来源
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  estimations
    Parameter Estimations for the Accelerated Life Tests
    加速寿命试验的参数估计
短句来源
    The joint estimations of constant systematic errors ofradar testing data and optical testing data
    光测和雷测常值系统误差的联合估计
短句来源
    Approximate Maximum Likelihood Estimations for Lognormal Distribution
    对数正态分布参数的近似极大似然估计
短句来源
    Target maneuvering estimations using H_∞ filter and self-tuning second-order Markov Process Model
    自调节鲁棒H_∞滤波目标机动估计
短句来源
    The estimations of model parameter, model error and noise error are given.
    文中给出了模型参数、模型误差和噪声误差的估计
短句来源
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      estimation
    The results are interpreted in the context of spectral estimation of ARMA processes.
          
    An Estimation of the Truncation Error for the Two-Channel Sampling Formulas
          
    The aim of the article is to obtain an estimation for the truncation error in the
          
    Minimum-Variance Multitaper Spectral Estimation on the Sphere
          
    Such an estimate is both more representative of the target region and reduces the estimation variance when compared to estimates formed by any single bandlimited window.
          
    更多          
      estimate
    We develop a general theory, then compute or estimate the essential dimension for a number of specific groups, including all of the above-mentioned examples.
          
    This estimate for multiplicities is uniform, i.e., it depends not on G/H, but only on its complexity.
          
    In the case of an orthonormal basis, our estimate reduces to Kadec' optimal 1/4 result.
          
    In Section 4 we obtain a good λ estimate for the one-sided function, and in Sections 5 and 6 we apply the results already obtained to fractional integrals and multiplier operators.
          
    We estimate ∥f∥p from above by C∥f∥p,n and give an explicit value for C depending only on p, τ, and characteristic parameters of the sequence {tn}n∈?.
          
    更多          
      estimates
    Trace Inequalities, Maximal Inequalities, and Weighted Fourier Transform Estimates
          
    Singular Value Estimates for Certain Convolution-Product Operators
          
    We present two-sided singular value estimates for a class of convolution-product operators related to time-frequency localization.
          
    Singular Value Estimates for Certain Convolution-Product Operators
          
    Estimates from below for the norms of linear means of multiple Fourier series are obtained.
          
    更多          
      estimations
    The interval estimations for the parameters and other reliability characters of a three parameter Weibull distribution
          
    This paper discusses the interval estimations method for the parameters and other reliability characters of a three-parameter Weibull distribution.
          
    A simulated example is also given to show the visual performance of the estimations.
          
    The performance of simulation shows that the estimations are highly satisfactory.
          
    Many textural measures have been developed and used for improving land cover classification accuracy, but they rarely examined the role of textures in improving the performance of forest aboveground biomass estimations.
          
    更多          


    Let X(t) be a stationary ergodic random signal, then its power spectrum density at frequency f isWhen we find the power spectrum density by means of the power spectrum density analyzer, the time of integration T. the filter bandwidth B and the RC-time constant of the integrator are not ideal, therefore the output of the analyzer is a random variable. This paper derives the formula used to calculate the influence of the RC-time constant to the output of the analyzer. The output of the analyzer is a biased estimate...

    Let X(t) be a stationary ergodic random signal, then its power spectrum density at frequency f isWhen we find the power spectrum density by means of the power spectrum density analyzer, the time of integration T. the filter bandwidth B and the RC-time constant of the integrator are not ideal, therefore the output of the analyzer is a random variable. This paper derives the formula used to calculate the influence of the RC-time constant to the output of the analyzer. The output of the analyzer is a biased estimate of the real power spectrum density. When T≥4RC, the relative deviation may be less than 2%. The RC-time constant has no significant influence to the statistical error, but the relative deviation may be more than 20 db when the time of integration T is too short. The relative accuracy may be adjusted by the standard Sine signal. The-oretical results presented in this paper are examined to be coincident with the experimental ones.

    设x(t)是平稳的,各态历经的随机过程,则在频率f的功率谱密度W(f)为在用电子模拟设备求功率谱密度时,积分时间T、带宽B及积分器的积分常数都不是理想的,从而模拟设备一次处理的结果是一个随机变量。本文分析了积分器的时间常数的影响。分析表明:由于积分器的时间常数RC的存在,模拟设备输出的功率谱密度是真功率谱密度的有偏估计,当T≥4RC时,其相对偏差可小于2%。分析表明:RC对统计误差基本上没有影响。但积分时间如选得过短,将可能产生多达20db的相对偏差。用标定的正弦信号可判定所选的积分时间是否合适。文中附有试验的记录曲线,它说明试验与理论分析是一致的。

    The three-dimensional unsteady second-order non-homogeneous differential equation has been derived by superposition of a small disturbance on a given steady three-dimensional flow. Based on the assumption of high Mach numbers this second-order equation for unsteady flow reduces to a form analogous to that for steady flow. This makes it possible to solve the equation by methods used in the second-order theory for steady flows. In the course of solution the flows are constrained and corrected according to the...

    The three-dimensional unsteady second-order non-homogeneous differential equation has been derived by superposition of a small disturbance on a given steady three-dimensional flow. Based on the assumption of high Mach numbers this second-order equation for unsteady flow reduces to a form analogous to that for steady flow. This makes it possible to solve the equation by methods used in the second-order theory for steady flows. In the course of solution the flows are constrained and corrected according to the PLK method, and singularities are thus eliminated. The crucial point in this procedure is to find the correct particular solutions. Two particular solutions are used. One is the approximate three-dimensional particular solution. The other is obtained under the assumption of local two-dimensionality. In addition, the uniform particular solution is given, from which the uniform second-order solutions may be obtained. Then, we have treated the unsteady problem for delta wings with low aspect ratio and supersonic leading edges. The Mach number range for application of the present theory is from supersonic to low hypersonic values with reduced frequencies up to near unity. The theoretical results derived in this work can be used to calculate the unsteady aerodynamic characteristics of wings having arbitrary airfoil sections.As experimental information for similar conditions is not yet available, we can only compare our results with those of Liu D. D. . For this reason, only the derivation for a flat delta wing oscillating at low frequencies has been carried out and an analytical expression is obtained for the first order expansion of the unsteady velocity potential. In the range of Mach numbers 4 to 8, our results are in agreement with those of Lui D. D. .It is also shown that under conditions of three-dimensional thin wings the second-order theory is valid up to Mδ=1.0, while according to application of the second-order theory to bodies of revolution by Van Dyke, the useful upper limit of M5 is only 0.7. Hence, with Mδ=0.7-1 .0, the principal non-linear effects can be calculated by our second-order theory, while for thin wings the third-order terms connected with heat transfer and entropy change can be ignored.

    本文处理了超音速三元薄翼非定常问题,通过PLK法使二次解均匀有效。首先考虑零攻角或初始攻角时,已知基本定常绕流叠加高-量级的非定常小扰动流,把它线性化。本方法从健全的基本方程出发,使用高马赫数近似,将非定常二次方程化简,其形式与定常二次方程类似,因而有可能利用定常二次理论的方法求解。特解是求解的关键。鉴于精确特解的复杂性,本报告采用了一种近似特解。 本方法适于一般超音速和完全高超音速之间的马赫数区域(约3~8),折合频率可达至1左右。可较精确地估计厚度,初始攻角对非定常气动力,力矩的影响。 目前据我们所知,还没有有关实验数据,只能和一些理论结果进行比较。为此对低频有初始攻角的超音速前缘平板三角翼进行了计算,在马赫数3~8,与D.D.Liu~[6]比较吻合。计算结果表明,三元薄翼二次理论可用到高超音速相似参数Mδ=1.0。

    In this paper a method is presented, in which the rotation angle from sun-earth midsean λ_(se) in addition to the earth angle θ_e and sun angle θ_s are simultaneously used for determinating spinstabilized geostationary satellite attitude. This method gives uniquely one unambiguous attitude. Solution, simplifies the algorithm, eliminates regions of high correlation and low measurement density occuring when using two attitude measurements, and provides geometric condition where singularity occures only if the...

    In this paper a method is presented, in which the rotation angle from sun-earth midsean λ_(se) in addition to the earth angle θ_e and sun angle θ_s are simultaneously used for determinating spinstabilized geostationary satellite attitude. This method gives uniquely one unambiguous attitude. Solution, simplifies the algorithm, eliminates regions of high correlation and low measurement density occuring when using two attitude measurements, and provides geometric condition where singularity occures only if the earth and sun vectors are co-linear. By this method, the angle λ_(se) is conveniently incorporated into the kalman or least square filter. Digital simulation showed that better accuracy of attitude determination and filter estimation can be obtained bv this method.

    本文提出一种同时利用地球角θ_c、太阳角θ_s和星日-星地转动角λ_(sc)三种姿态测量信息,确定卫星姿态的方法。该法算式简易,可唯一地确定卫星姿态。消除了采用两种姿态测量信息的姿态确定方法所引起的高相关和低测量密度的不良区域。本文方法仅有太阳矢量和地球矢量共线的几何限制,能方便地把λ_(sc)引入滤波器。通过数字仿真,表明此法可得到良好的姿态确定精度及滤波估计

     
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