水声测量中的宽频技术应用方法  

Applied method of broadband technique in underwater acoustic measurement

作　　者：张宝华[1] 吴本玉[2] 莫喜平[2] 崔政[2] 

机构地区：[1]海军装备部电子部,北京100841 [2]中国科学院声学研究所

出　　处：《声学技术》2008年第4期519-523,共5页Technical Acoustics

摘　　要：讨论一种基于宽频分析技术进行水声测量的方法——宽频噪声比较法。该方法从频域分析的角度出发,根据水声测量的实际需要,通过修改Welch法理论,以噪声为信号源,运用现代信号处理技术和数字化硬件系统,实现了水听器的宽频噪声比较法校准系统在宽频范围内的快速高效测量,是对单频脉冲比较法的一个重要补充。对于高Q值水声换能器的测量,避免信号瞬态效应的影响,采用宽频噪声技术更有优势。还对不同采样频率条件下的测量结果进行了比较,结果表明宽频噪声比较法采用脉冲序列内多个脉冲处理结果累加取平均的方法,可以降低对采样频率的要求,或者在设备最高采样频率一定条件下可以实现更高频率范围的测试。A method based upon broadband analysis technique to make the underwater acoustic measurement is named broadband noise comparison method. From the viewpoint of frequency domain analysis,according to the actual demand and by modifying Welch method, it uses the noise signal source and applies modem signal processing technique and digitalizer hardware system to achieve a rapid and efficient broadband measurement with a hydrophone in the broadband noise comparison calibration system. This is an important supplement to single-frequency pulse comparison method. For the measurement of high Q-factor underwater transducers, the broadband noise comparison method has a good advantage in preventing transient effect. Also by comparing with the measuring results in different sampling rate, a conclusion can be drawn that the broadband noise comparison method adopts the way to average the sum of pulse sequence processing results, and reduces the requirement of sampling rate. That is to say, the higher frequency measurement can be achieved under the certain condition of the fixed maximum sampling rate of the instnnnent.

关 键 词：水声 测量 宽频 单频 比较法 频域 校准Welch 

分 类 号：TB556[理学—物理]