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宽带声学多普勒流量剖面仪的系统仿真
引用本文:王森,林善明,张秀萍,朱昌平,王耀俊.宽带声学多普勒流量剖面仪的系统仿真[J].声学技术,2004,23(2):113-116.
作者姓名:王森  林善明  张秀萍  朱昌平  王耀俊
作者单位:1. 河海大学计信学院,江苏,常州,213022
2. 南京大学近代声学国家重点实验室,江苏,南京,210093
基金项目:国家自然科学基金资助(19174037)
摘    要:90年代初发展起来的宽带声学多普勒流量剖面仪克服了传统窄带ADCP存在距离分辨力与速度分辨力之间的矛盾,从而解决了低速浅水河流流量(流速)精确测量的问题,是一种有着广泛应用前景的先进水文遥测仪器。文章中着重分析了BBADCP(宽带声学多普勒流量剖面仪)如何通过时间选通采样从河流不同深度返回的后向散射回波,实现测距离的目的;如何测量回波的多普勒频移,实现测流速的目的。文中从二维信号矢量的角度分析了多普勒频移调制和解调的过程,推导出提取速度信息的信号处理方法。文中最后采取等效基带仿真方法,运用匹配滤波器理论设计了一个BBADCP系统模型,通过仿真手段验证了文中对BBADCP的分析结果。

关 键 词:计算机仿真  流量剖面仪  宽带声学  多普勒频移  匹配滤波器
文章编号:1000-3630(2004)02-0113-04
收稿时间:2003/5/9 0:00:00
修稿时间:2003/7/11 0:00:00

Simulation of broad-band acoustic Doppler current profile
WANG Sen,LIN Shan-min,ZHANG Xiu-ping,ZHU Chang-ping and WANG Yao-jun.Simulation of broad-band acoustic Doppler current profile[J].Technical Acoustics,2004,23(2):113-116.
Authors:WANG Sen  LIN Shan-min  ZHANG Xiu-ping  ZHU Chang-ping and WANG Yao-jun
Affiliation:Department of Computer & Information Engineering, Hehai University, Jiangsu Changzhou 210032, China;Department of Computer & Information Engineering, Hehai University, Jiangsu Changzhou 210032, China;Department of Computer & Information Engineering, Hehai University, Jiangsu Changzhou 210032, China;Department of Computer & Information Engineering, Hehai University, Jiangsu Changzhou 210032, China;State Key Laboratory of Modern Acoustics, Nanjing University, Jiangsu Nanjing 210093, China
Abstract:Broad-band ADCP invented in the early 1990s has improved both distance resolution and speed resolution in contrast to narrow-band ADCP, making it possible to obtain precise measurements of discharge in a shallow river with a low flow speed. This paper focuses on how BBADCP profiles the river by time gating and sampling the received echo from different depths, and how it measures flow speed based on Doppler shift. Using two-dimensional signal vectors, the process of Doppler shift modulation and demodulation is analyzed, and a signal processing method for extracting flow speed information is derived. A BBADCP system model based on base-band simulation and the matched-filter theory is established and the theory is tested with simulation.
Keywords:ADCP  computer simulation  current  Doppler
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