【摘要】 提出一种基于互Wigner-Ville分布(XWVD)的瞬时频率迭代估计方法。理论分析了该方法的收敛性,通过仿真比较了各种瞬时频率估计方法在噪声下的估计方差,证明此方法在低信噪比情况下对估计线性调频信号的瞬时频率有较好的效果。并采用加窗的方法改进了此算法,仿真结果证明,改进的方法对非线性调频信号的瞬时频率进行了有效估计。更多还原

【Abstract】 This paper presents an instantaneous frequency iterative estimation based on the cross Wigner-Ville distribution(XWVD).The convergence of the method is analyzed theoretically.The estimation variance of different methods in noise is compared by simulation,and this algorithm is demonstrated having good performance for linear frequency modulation(FM) signals under low signal noise ratio.This method is improved by a sliding window,which is effective in estimation of nonlinear FM signals according to simulation results.更多还原