检测多项式相位信号的时频综合方法  

Polynomial phase signals detection by different time frequency method synthesis

作　　者：郭汉伟[1] 王岩[2] 梁甸农[2] 

机构地区：[1]第二炮兵装备研究院总体所,北京100085 [2]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《系统工程与电子技术》2004年第4期482-484,共3页Systems Engineering and Electronics

摘　　要：多项式威格纳分布是一种高精度的多项式相位信号检测方法,但是对噪声敏感,多信号情况下受交叉项困扰。而短时傅里叶变换对噪声不敏感,没有交叉项问题,但时频分辨率较低。首先构造了一组高效6阶多项式威格纳分布,将多项式威格纳分布与短时傅里叶变换的结果按照"与"操作和"滤波"操作相综合,得到高分辨的多项式相位信号时频分布。仿真结果表明,不同时频分析方法综合能够在低信噪比的条件下检测到多项式相位信号。Polynomial Wigner-Ville distribution (PWVD) can detect polynomial phase signal. PWVD is of high resolution performance, not robust to noise. At the same time, PWVD suffers the cross-terms and low efficiency algorithm. Short time Fourier transform (STFT) also can detect PPS. STFT is not of high resolution. But, STFT is robust to noise and has no cross-term. A novel 6-order polynomial Wigner-Ville distribution is constructed. The PWVD is of high calculation efficiency. The results of PWVD and short time Fourier transform are fused in both 'and' operation and 'filter' operation. And so high resolution, robustness to noise time-frequency distribution of signal are obtained. By simulation, it is proved that different time frequency method fuse can reject the noise and cross-terms and detect the multicomponent high order PPS in low SNR.

关 键 词：多项式相位信号 多项式威格纳分布 短时傅里叶变换 

分 类 号：TN57.51[电子电信]