该程序用于描述UKF无迹卡尔曼滤波器，其中systemfun为系统函数，measurefun为测量函数。用于非线性系统的滤波有较好的效果。(The program is used to describe the UKF unscented Calman filter, in which systemfun is the system function, and measurefun is the measurement function. The filtering for nonlinear system has good effect.)