方差分析表明：圆筒筛速度是影响谷粒分离率的最重要的参数。
Experimental variance analysis shows that the peripheral velocity of the rotating screen is one of the most important factors which affect the percentage of grain separation from straw and chaff.
协方差速度谱是基于采样数据可以排列成协方差矩阵的特征结构而设计的。
Covariance velocity spectrum is based on the fact that the sampled data can be arranged in eigen structure of covariance matrix.
其根据多普勒雷达径向速度资料的特点，水平方向采用非各向同性的单变量背景场误差协方差函数。
As for the characters of the Doppler Radar radial velocity data, the single variable background error covariance is used. And the anisotropic covariance function is adopted in the horizontal plane.
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