水声信号多参量估计的PWVD改进方法  

Estimation of multi-parameters of underwater acoustic signal with improved PWVD

作　　者：王海燕[1] 张颖峰[1] 刘家亮[1] 姜喆[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《声学技术》2010年第1期14-17,共4页Technical Acoustics

摘　　要：Pseudo Winger-Ville分布(PWVD)是处理非平稳信号的有力工具,因其具有较高的时频聚集性更适合于实时处理,且选择合适的窗函数可降低旁瓣大小,提高分辨率。传统的PWVD可以对信号瞬时频率进行无偏估计,但其频率分辨率和时间分辨率不能同时兼顾;提出了一种插值PWVD法可克服此不足,极大地减小了频谱泄漏的负面影响,有效提高了频率估计与时间估计的精度。仿真和实测数据的分析结果验证了插值PWVD法的可行性与有效性。Pseudo-Winger-Ville Distribution （PWVD） is an effective tool for analyzing nonstationary signals. Its high time-frequency concentration and resolution makes it fit for real time processing. A suitable window function can bring two benefits： reducing side lobe and improving resolution. An unbiassed estimation of instantaneous frequency can be obtained by using peak PWVD, but consideration cannot be given to the resolution and variance simultaneously. The interpolated PWVD proposed in this paper can solve this problem to greatly reduce the negative effects of spectrum leakage and effectively enhance the estimate precisions of the frequency and the time. Simulation and measurement data show the feasibility and effectiveness of this method.

关 键 词：PWVD 插值PWVD 瞬时频率 回波到达时间 脉冲宽度 

分 类 号：TN911.23[电子电信—通信与信息系统]