摘要
针对加性色噪声背景下的多分量线性调频信号参量估计问题,提出了基于相位差分的时频子空间方法。该方法将时频子空间的方法引入线性调频信号参量估计中。首先对多分量线性调频信号做相位差分,然后在时域内利用子空间方法对差分后的信号进行滤波,最后用基于矩阵束的方法进行频率估计。本方法消除了使用相位差分而带来的交叉项的干扰,同时能够很好的消除加性色噪声对多分量线性调频信号的参量估计的影响。仿真实验证明了本方法的有效性。
For the problem of the parameter estimation of multi-component chirp signal in the additive colored noise, a method based on phase difference and time-frequency signal filter was proposed. This method originatively uses signal filtering in the time-frequency domain for the parameter estimation of chirp signal. Firstly, phase difference was done to the multi-component chirp signal, then filter was done by using time-frequency sub-space method, finally the frequency estimation was maed by using matrix pencil method. The method proposed in this paper eliminates the interference of the noise and the cross-terms which are brought by phase differencing. So using this method we can do high precision parameter estimation of multi-component chirp signal. The simulation results demonstrate the algorithm in this paper.
出处
《长春理工大学学报（自然科学版）》
2008年第4期98-101,97,共5页
Journal of Changchun University of Science and Technology(Natural Science Edition)
关键词
多分量线性调频信号
时频子空间方法
加性色噪声
相位差分
multi-component chirp signal
time-frequency space filter
additive colored noise
phase difference
