The accurate mathematical model of WIM is difficult to establish because WIM's parameters change with time when they work. 摘要动态称重系统在测量的过程中为一时变系统，难以对称重系统建立精确的数学模型。
STF adds multi-fading factors in EKF, thus it has strong tracking capability and good robustness, and can deal with variation parameter system effectively. 强跟踪滤波在卡尔曼滤波的基础上引入了多重渐消因子，使强跟踪滤波具有极强的跟踪能力和较好地鲁棒性，因此可以很好地解决变系统变参数的问题。
