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arXiv 1809.02196stat.MLcs.LGeess.SP
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贝叶斯非参数谱估计

Bayesian Nonparametric Spectral Estimation

Universidad de Chile(智利大学)

Felipe Tobar

摘要:

谱估计(SE)旨在识别信号的能量(例如,时间序列)分布在不同的频率上。当只有部分和噪声观测信号可用时,这可能变得特别具有挑战性,其中当前方法无法适当处理不确定性。在这种情况下,我们提出了一个联合概率模型的信号,观测和频谱,SE是作为一个精确的推理问题。假设高斯过程先验于信号,我们应用贝叶斯规则来找到给定一组观测值的频谱的解析后验分布。除了它的表现力和自然的频谱不确定性,该模型还提供了一个函数形式的功率谱密度表示,可以有效地优化。与以前的方法,特别是对Lomb-Scargle的比较,在理论上和实验中也在三个不同的情况下。代码和演示可在https://github.com/GAMES-UChile/BayesianSpectralEstimation获得。

英文摘要:

Spectral estimation (SE) aims to identify how the energy of a signal (e.g., a time series) is distributed across different frequencies. This can become particularly challenging when only partial and noisy observations of the signal are available, where current methods fail to handle uncertainty appropriately. In this context, we propose a joint probabilistic model for signals, observations and spectra, where SE is addressed as an exact inference problem. Assuming a Gaussian process prior over the signal, we apply Bayes' rule to find the analytic posterior distribution of the spectrum given a set of observations. Besides its expressiveness and natural account of spectral uncertainty, the proposed model also provides a functional-form representation of the power spectral density, which can be optimised efficiently. Comparison with previous approaches, in particular against Lomb-Scargle, is addressed theoretically and also experimentally in three different scenarios. Code and demo available at https://github.com/GAMES-UChile/BayesianSpectralEstimation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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