扩展卡尔曼滤波可通过将非线性系统在其参考点处作泰勒级数展开，取其一阶线性部分作为该非线性模型的逼近，从而得到非线性系统在当前时刻的线性化描述。(Extended Kalman filter (EKF) can get the linearized descr iption of the nonlinear system at the current time by expanding the nonlinear system with Taylor series at its reference point and taking the first-order linear part as the approximation of the nonlinear model.)