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随机过程的自相关函数 For any random process X_{t}, the Autocorrelation at time instants t_{1} and t_{2} is: \displaystyle\mathbf{E}[X_{t_{1}}X_{t_{2}}]=\int_{\Omega}X_{t_{1}}(\alpha)X_{t_{2}}(\alpha)P(d\alpha)=\int_{\mathbb{R}^{2}}x_{1}x_{2}\mu_{t_{1}t_{2}}(dx_{1}\times dx_{2}) where \mu_{t_{1}t_{2}}(dx_{1}\times dx_{2}) is a joint probability distribution.
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