交互多模型在车辆组合定位系统中的应用（英文）

为解决扩展卡尔曼滤波器(extended Kalman filter,EKF)在车辆组合定位系统中因车辆加减速、转弯(以下简称机动)而存在的精度低、稳定性差等问题,设计了一种将交互多模型(interacting multiple model,IMM)算法与非线性卡尔曼滤波器相融合的自适应滤波算法。该算法使用三种状态空间模型来描述车辆的运动模式,采用多个非线性滤波器对每个模型并行滤波,通过模型匹配似然函数对滤波结果进行加权融合,最终得到系统的定位信息。该方法具备非线性系统滤波器优点,克服了单一模型滤波算法对机动目标定位效果差的缺点。利用该方法和EKF算法分别对GPS/INS/DR车辆组合定位系统中进行了仿真实验,结果表明,该算法的滤波定位精度明显优于目前组合定位系统中所用的EKF滤波器,大幅提高了组合定位系统的稳定性和定位精度。

Application of interacting multiple model in integrated positioning system of vehicle

To solve low precision and poor stability of the extended Kalman filter (EKF)in the vehicle integrated positioning system owing to acceleration,deceleration and turning (hereinafter referred to as maneuvering),the paper presents an adaptive filter algorithm that combines interacting multiple model (IMM)and non-linear Kalman filter.The algorithm describes the motion mode of vehicle by using three state space models.At first,the parallel filter of each model is realized by using multiple nonlinear filters.Then the weight integration of filtering result is carried out by using the model matching likelihood function so as to get the system positioning information. The method has advantages of nonlinear system filter and overcomes disadvantages of single model of filtering algorithm that has poor effects on positioning the maneuvering target.At last,the paper uses IMM and EKF methods to simulate the global positioning system (GPS)/inertial navigation system (INS)/dead reckoning (DR)integrated positioning system,respectively.The results indicate that the IMM algorithm is obviously superior to EKF filter used in the integrated positioning system at present.Moreover,it can greatly enhance the stability and positioning precision of integrated positioning system.