Methods:Based on the spatial correlation or autocorrelation hypothesis, the spatial semivariograms model of HFRS was built, and the fractal D of HFRS was calculated by its semivariograms model.
方法：在疾病空间相关自相关假设下，构造疾病空间分布变异函数模型，应用变异函数计算HFRS的空间分维D值。
The model of array signal is described first, and then the principle of 2-D spatial-temporal spectrum estimation is analyzed.
文中首先介绍了阵列信号模型，分析了空时二维谱估计的原理。
The model of array signal is described first, and then the principle of 2-D spatial-temporal spectrum estimation is analyzed.
文中首先介绍了阵列信号模型，分析了空时二维谱估计的原理。
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