因为这时模型协方差阵结构仍含有方差参数，因此我们的目标是寻求可行估计。
The variance-covariance matrix still include parameter of variance in this condition, so our purpose is to look for feasible estimations.
算法同时利用目标方差特性以减少虚警率。
The standard variance characteristic of target data is used to reduce false alarm rate.
为解决目标跟踪精度与观测时间间隔的矛盾，提出了一种基于目标状态估计协方差控制的观测时间确定算法。
To solve the contradiction between target tracking accuracy and observation interval, an algorithm of calculating observation time based on target estimate covariance control was presented.
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