基于模糊无迹卡尔曼滤波算法的锂电池SOC估计

针对未知噪声条件下在线估计锂电池荷电状态精度低的问题,提出了将无迹卡尔曼滤波算法与模糊推理相结合的模糊无迹卡尔曼滤波算法。为了验证算法的有效性,首先建立了适应于FUKF估计SOC的二阶电池模型,在此基础上,采用离线的参数辨识方法辨识模型中相应的参数并进行模型精确度验证,其次设计实验对比模糊无迹卡尔曼滤波方法与传统EKF、UKF方法的估算精度,实现FUKF方法精确度验证。实验结果表明在未知噪声条件下估算SOC,FUKF方法误差小于0.5%,EKF、UKF方法误差在0.5%~1%之间波动,FUKF方法较UKF方法具有收敛速度快、估算精度高的优点。

基于模糊自适应无迹Kalman滤波的车辆状态参数估计

为了精确估计车辆行驶状态参数,提出了一种基于模糊自适应无迹卡尔曼(Kalman)滤波的车辆状态参数估计方法,将模糊控制引入到无迹卡尔曼滤波算法中,通过模糊控制动态调整系统测量噪声,实现滤波的自适应调节。采用非线性三自由度汽车模型作为车辆状态参数估计模型,以前轮转角和纵向加速度为系统输入向量,以横摆角速度、质心侧偏角及纵向车速为状态向量,以侧向加速度为输出向量。应用Carsim软件和Matlab/Simulink软件进行联合仿真,验证该算法的有效性,结果表明:模糊自适应无迹卡尔曼滤波算法比无迹卡尔曼滤波和扩展卡尔曼滤波估计精度高、效果好。

Geomagnetic Orbit Determination Using Fuzzy Regulating Unscented Kalman Filter

Geomagnetic orbit determination fits for nanosatellites which pursue low cost and high-density ratio,but one of its disadvantages is the poor position accuracy introduced by magnetic bias.Here,a new method,named the fuzzy regulating unscented Kalman filter(FRUKF),is proposed.The magnetic bias is regarded as a random walk model,and a fuzzy regulator is designed to estimate the magnetic bias more accurately.The input of the regulator is the derivative of magnetic bias estimated from unscented Kalman filter(UKF).According to the fuzzy rule,the process noise covariance is adaptively determined.The FRUKF is evaluated using the real-flight data of the SWARMA.The experimental results show that the root-mean-square(RMS)position error is 3.1 km and the convergence time is shorter than the traditional way.