基于方向性S变换的多分量FM信号瞬时频率估计  

Instantaneous frequency estimation of multicomponent FM signals based on directional S transform

作　　者：朱明哲 姬红兵[1] 林琳[1] 王磊[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《系统工程与电子技术》2013年第1期29-33,共5页Systems Engineering and Electronics

基　　金：中央高校基本科研业务费"复杂环境下雷达辐射源个体信号预处理方法研究"(K50511020022)资助课题

摘　　要：针对复杂多分量调频信号的瞬时频率估计问题,提出一种基于方向性S变换的瞬时频率估计方法。首先,在S变换中引入变趋势窗,有效改善了高频区的频率分辨率;其次,提出了方向性S变换,该变换在引入方向性参数的基础上,利用最大化准则实现了复杂调频信号的时频方向匹配;最后,由于传统时频脊线及相应的均方根误差准则无法适用于多分量信号瞬时频率估计的性能评估,提出一种基于支撑域的置信度准则。仿真实验通过线性与非线性的多分量混合调频信号证明了该方法的有效性。A directional S transform is proposed to estimate the instantaneous frequency ot multtcomponent frequency-modulated signals. High performance is achieved by three stages. Firstly, to resolve the low frequen cy resolution on the time frequency plane at high frequency, a varying tendency window is introduced into the S transform. Secondly, in order to achieve the directional matching of the complex frequency-modulated（FM） sig nals on the time-frequency（TF） plane, the directional S transform is presented by incorporating directional pa- rameter and maximal rule. Finally, since the TF ridge and the corresponding mean square errors will be invalid under multicomponents conditions, a confidence criterion of auto-term region is also proposed. The effectiveness of the presented method is verified by the mixture of linear and nonlinear FM signals.

关 键 词：瞬时频率估计 方向性S变换 多分量调频信号 变趋势窗 

分 类 号：TN953[电子电信—信号与信息处理]