水下航行器噪声源分布位置估计的瞬时频率变化率算法研究  

Instantaneous frequency rate estimation algorithm for measurement of noise source distribution on underwater vehicle

作　　者：杨龙[1] 杨益新[1] 徐灵基[1] 孙超[1] 田丰[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《声学学报》2015年第4期500-510,共11页Acta Acustica

基　　金：国家自然科学基金(11274253)资助

摘　　要：使用单个传感器实现水下航行器纵向分布噪声源位置的估计。应用传感器接收的多普勒信号瞬时频率变化率具有极值性的特点,通过推导并定义一种时间-频率变化率分布(L-相位分布),给出其有效离散迭代算法,能够提取出多普勒信号的瞬时频率变化率曲线,得到该曲线极值点位置的估计值,并结合水下航行器的航速,可以估计出线谱噪声源在航行器上纵向的分布位置。海试数据给出了105 Hz,220 Hz和500 Hz等三种线谱噪声源的位置估计误差,其定位误差均不超过2.5 m,表明该方法对于中低频率噪声源具有较高的位置估计精度。The longitudinal distribution of tone noise sources on a moving underwater vehicle can be estimated via the minimum point appearing on the instantaneous frequency rate curves of Doppler signal received by a single sensor measuring system. A time-frequency rate distribution referred to as L-Phase Distribution （LPD） and an iteration algorithm to realize the discrete-time LPD are proposed to extract the IFR curve of Doppler signal. Together with the velocity of vehicle, the measurement of the distribution of tone noise sources with different frequencies on underwater target can be achieved. The sea experiment results give out estimation errors for three different operating frequencies： 105 Hz, 220 Hz and 500 Hz. The values of these errors are all less than 2.5 m, which approve the effectiveness of the new method for middle and low frequency noise sources.

关 键 词：噪声源 水下航行器 瞬时频率 分布位置 多普勒信号 位置估计 纵向分布 迭代算法 海试 正横 

分 类 号：U661.44[交通运输工程—船舶及航道工程]