非均匀跳频信号参数估计方法  

Parameterestimation of non-uniform frequency-hopping signal

作　　者：冯维婷 梁青 FENG Weiting;LIANG Qing(School of Electronic Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《西安邮电大学学报》2020年第2期15-18,28,共5页Journal of Xi’an University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61202490);西安邮电大学校青年教师科研基金项目(101-0486)。

摘　　要：针对非均匀跳频信号的跳变时刻和跳变频率估计问题,提出一种基于时频分析的参数估计方法。将非均匀跳频信号利用近似L0范数的稀疏表示算法进行时频分析。提取最大值曲线得到时频脊线,进行差分运算得跳变时刻估计值,对相邻2个跳变时刻之间的瞬时频率做平均得到跳变频率估计值。仿真结果表明,相比于短时傅里叶变换和平滑伪魏格纳分布方法,利用所提方法估计跳变时刻和跳频频率的时频分辨率、精度和鲁棒性较好。A time-frequency analysis estimation method is proposed for the hopping time and frequency parameters estimation of non-uniform frequency hopping(FH)signal.The FH signal is converted to the two-dimensional time-frequency plane by using approximate L0 norm method,then the hopping time is estimated by extracting the maximum curve and carrying out differential operation of it.According to two adjacent hopping times,the instantaneous frequency is achieved,and then the FH frequency is calculated as the average of the instantaneous frequency.Simulation results show that compared with the short time Fourier transform(STFT)and the smoothed pseudo Wigner-Ville distribution(SPWVD)methods,the proposed method can achieve higher resolution,higher accuracy and better robust on parameter estimation of the hopping time and FH frequency.

关 键 词：非均匀跳频信号 参数估计 时频分析 稀疏表示 

分 类 号：TN911.7[电子电信—通信与信息系统]