针对两颗天基光学卫星对低轨非合作目标进行无源定位跟踪的问题,提出了一种基于Newton迭代与扩展卡尔曼滤波(Newton iteration and extended Kalman filter,N-EKF)的定位跟踪算法.首先,将基于角度测量信息的双星观测模型转化为双直线公垂线中点问题,并进一步转化为非线性方程问题,使用Newton迭代算法得到非合作目标的初始定位信息.然后,采用扩展卡尔曼滤波(extended Kalman filter,EKF)方法,在初始定位信息基础上,结合近地轨道动力学模型,实现对非合作在轨目标的精确跟踪滤波.最后,通过仿真验证了所提方法的可行性及优势.
Double satellite borderless location and tracking algorithm for non-cooperative low orbit target based on N-EKF
Aiming at the problem of location and tracking non-cooperative low orbit target in two satellites case,an location and tracking algorithm based on the Newton iteration and extended Kalman filter(N-EKF)is proposed.Firstly,the double satellite observation model based on angle measurement information is transformed into two straight lines perpendicular midpoint problem,which is further transformed into non-linear equations problem.The Newton iterative algorithm is used to calculate the initial location information of the non-cooperative target.Then,based on initial positioning information,extended Kalman filter(EKF)and the near-earth orbit dynamic model are used to achieve the precise tracking filter of the non-cooperative in-orbit target.Finally,simulation result verifies the feasibility and advantages of the proposed method.
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