用扩展KALMAN滤波器计算多径下两路间时延

尝试通过扩展Ｋａｌｍａｎ滤波器计算两独立接收端接收同一信号时的接收时间差,并考虑了存在多径干扰时的情况,方法如下：１）运用卷积定理,交埋延估计问题转化成对一线性滤波器系数的估计问题;（２）运用ＥＫＦ,使对滤波器多个系数的估计转化为对一个或几个参数的估计;（３）在多径情况下,同时对三个滤波器进行处理,使两点信号的差值平方最小,并在叠代过程中采用类似分时的处理,使对多径情况下两路时延的估计过程大大简化

Time Delay Estimation of Two Independent Receivers in Multipath Using the Extended Kalman Filter

A method for computing the time delay parameter between two independent receivers receiving the same signal by using extended Kalman filter(EKF) is proposed, and the presence of multipath is also considered. By use of the convolution theorem, the estimation of time delay can be transformed to the coefficients estimation of a finite impulse response filter. Then by using EKF, the estimation of coefficients is replaced by estimation of one or several parameters, which can reduce the computation. In the case of multipath, making the mean square error of two signals least is adopted to obtain the coefficients of three filters, and simplification of the estimation process can be realized by applying the time-divided method. The result of computation indicates this algorithm has advantages of fast convergence and high accuracy. Therefore it is useful for real-time processes.