高阶统计量对高斯噪声不敏感,可以解决色噪声背景下的相干信号源DOA估计问题。
2023-04-25 21:53:50 2KB DOA  FOC
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针对目前概率潮流计算方法普遍存在计算复杂、计算量大的问题,采用经过解耦简化的线性化交流潮流模型,并用累积量代替传统的卷积技术,只需1次潮流计算就可以通过Gram-Charlier级数得到状态量的概率密度函数。其计算步骤可描述为:给定注入功率的概率描述,计算各阶原点矩;计算注入功率的累积量;计算节点电压和支路潮流的各阶累积量;计算节点电压和支路潮流的各阶原点矩和中心矩;计算Gram-Charlier级数的系数,从而得到节点电压和支路潮流的概率密度函数和概率分布函数。算例结果证明该方法方便、快速且能保证计算精度。
2022-12-19 11:19:35 971KB 累积量 概率潮流 矩量
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MATLAB高阶累积量工具箱,包含内容有: Higher-Order Spectrum Estimation: conventional methods % cum2x - Estimates cross-covariance % cum3x - Estimates third-order cross-cumulants % cum4x - Estimates fourth-order cross-cumulants % cumest - Estimates auto-cumulants, orders two, three, or four % (cum2est, cum3est, cum4est are sub-ordinate routines) % bicoher - Estimates bicoherence, direct method % bicoherx - Estimates cross-bicoherence, direct method % bispecd - Bispectrum estimation (direct method) % bispecdx - Cross-Bispectrum estimation (direct method) % bispeci - Bispectrum estimation (indirect method) % glstat - Gaussianity-Linearity detection statistics (Hinich test) % % Higher-Order Spectrum Estimation: parametric methods % armaqs - Estimates ARMA parameters via q-slice algorithm % armarts - Estimates ARMA parameters via residual time-series algorithm % armasyn - Generates ARMA synthetics % arorder - Estimates AR order % arrcest - Estimates AR parameters using correlation &/or cumulants % bispect - Theoretical bispectrum of an ARMA process % cumtrue - Computes theoretical (true) cumulants of ARMA processes % maest - Estimates MA parameters (GM algorithm) % maorder - Estimates MA order % rpiid - Generates a sequence of i.i.d. random variables, various p.d.f.'s % trispect - Computes 2-D slice of true trispectrum of ARMA process % % Quadratic Phase Coupling (QPC) % qpcgen - Generates quadratically-phase coupled harmonics in noise % qpctor - Detection of quadratic phase coupling via the TOR method % % Second-Order Volterra Systems % nlgen - Computes the output of a second-order Volterra system % nlpow - Power's method for parameters of 2nd-order Volterra system % nltick - Tick 's method for parameters of 2nd-order Volterra system % % Harmonic Retrieval % harmest - Estimates frequencies of harmonics % harmgen - Generates harmonics in Gaussian (colored) noise % % Time-Delay Estimation (TDE) % tde - Time-delay estimation using third-order cross cumulants % tdeb - Time-delay estimation using third-order cross bispectrum % tdegen - Generates synthetics for time-delay estimation % tder - Time-delay estimation using cross-correlation % % Array Processing - Direction of Arrival (DOA) estimation % doa - Estimates number of sources and their bearings (cum2 or cum4) % doagen - Synthetic generator for the DOA problem % % Adaptive Linear Prediction % ivcal - Computes instrumental variables (used by rivtr and rivdl) % rivdl - Recursive instrumental variable algorithm: double-lattice filter % rivtr - Recursive instrumental variable algorithm: transversal filter % % Impulse Response (IR), Magnitude and Phase Retrieval % biceps - Estimates impulse response via the bicepstrum method % bicepsf - Estimates impulse response via the bicepstrum (FFT) method % matul - Magnitude and phase retrieval (Matsuoka-Ulrych algorithm) % % Time-Frequency Distributions % wig2 - Wigner spectrum % wig2c - Wigner spectrum, with Choi-Williams type filtering % wig3 - Wigner bispectrum, diagonal slice % wig3c - Wigner bispectrum, with Choi-Williams type filtering % wig4 - Wigner trispectrum, diagonal slice % wig4c - Wigner trispectrum, with Choi-Williams type filtering % % Utilities % hprony - Prony's method for modeling transients % pickpeak - Picks peaks subject to a separation condition % tls - Total Least Squares Solution to a set of linear equations % trench - Trench recursion for non-symmetric Toeplitz matrices % % Demos and Quick Help % hosahelp - One-line synopsis of all HOSA mfiles % hosademo - A demo of the HOSA Toolbox
2022-11-29 14:51:24 101KB 高阶累积量
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MATLAB高阶累积量工具箱-MATLAB高阶累积量工具箱.part3.rar 近日,做高阶累积量DOA估计,用到了MATLAB高阶累积量工具箱,找了半天,终于找到了,贴出来给大家分享。
2022-11-27 15:27:16 808KB matlab
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四阶累积量稀疏表示的DOA估计方法.zip
2022-11-01 18:06:37 1.45MB DOA估计
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基于高阶累积量的调制格式识别,识别7种调制格式BPSK、QPSK、8PSK、8QAM、16QAM、32QAM、 64QAM
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图 11.17 汇流累积量计算窗口 (1) 在 Input flow direction raster 文 本框中,选择由无洼地 DEM 生成的水 流方向栅格数据 fdirfill。 (2) 在 Output accumulation raster 文本 框中,将数据文件名修改为 flowacc。 (3) 在 Input weight raster 文本框中输入配权数据,配权数据一般是表示降水、土壤 以及植被等对径流影响的因素分布不平衡而形成的,更能详细模拟该区域的地表特 征。如果无数据,系统默认为所有的栅格配以相同的权值 1,那么计算出来的汇流累 积量的数值就代表着该栅格位置流入的栅格数的多少。 (4) 点击 OK,完成计算。结果见图 11.18 所示。 图 11.18 通过计算生成的汇流累积量数据 9
2022-09-21 17:04:36 16.72MB 地理信息系统
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ESPRIT是一种基于阵列数据相关矩阵信息的广义特征值分解的高分辨率波达方向(DOA)估计算法。由于空间噪声的相关性,这种基于自相关的高分辨率算法将出现极大的偏差。本文针对自相关算法的局限性,提出一种基于高阶累积量的ESPRIT算法。实验结果表明,借助高阶累积量方法,不仅能有效地抑制高斯色噪声。而且还能获得高精度、高分辨率的渐进无偏估计。
2022-06-22 17:12:30 177KB 自然科学 论文
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