文章摘要
任浩宇,吴艳群,胡正良.声压传感器与振速传感器中心不一致带来的定向误差分析[J].声学技术,2015,34(6):570~574
声压传感器与振速传感器中心不一致带来的定向误差分析
Analysis of orientation error due to inconsistent centers of pressure sensor and particle velocity sensor
投稿时间:2015-04-23  修订日期:2015-07-20
DOI:10.16300/j.cnki.1000-3630.2015.06.020
中文关键词: 矢量水听器  中心不一致  互相关声能流法  定向误差
英文关键词: acoustic vector sensor  inconsistent centers  correlated acoustic intensity method  bearing estimation error
基金项目:
作者单位E-mail
任浩宇 国防科学技术大学海洋科学与工程研究院, 湖南长沙 410000 renhaoyu1990@163.com 
吴艳群 国防科学技术大学海洋科学与工程研究院, 湖南长沙 410000  
胡正良 国防科学技术大学海洋科学与工程研究院, 湖南长沙 410000  
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中文摘要:
      声矢量传感器由声压传感器和质点振速传感器组成,可用在空间某点同步测量声场的声压和质点振速信息。但矢量传感器在实际制作时,可能存在声压传感器和质点振速传感器中心不一致的情况,即矢量声场的非共点测量。这会使得声压与振速通道之间的接收信号存在时延差,从而影响矢量传感器的定向性能。从理论上分析了时延差对平均声强法定向的影响,即降低了信号处理的信噪比及引入π相位的定向误差,并提出采用互相关声能流法进行定向。通过仿真分析了中心不一致、入射角度和信噪比等因素对不同类型的目标定向结果的影响,并验证和讨论了互相关声能流定向算法的有效性和适用性。
英文摘要:
      An acoustic vector sensor is composed of a pressure sensor and a particle velocity sensor, and it can measure the pressure and particle velocity of a certain point in acoustic field synchronously. However, both the pressure sensor center and the particle velocity sensor center may not in the same position, which will lead to the time delay between the received pressure signal and particle velocity signal. In the paper, the effects of the time delay on the direction of arrival (DOA) are analyzed by using the average energy flow method, namely the signal-to-noise ratio will decrease and the phase error will arise in bearing estimation. A correlated acoustic intensity method is also proposed here to solve this problem. Effects of central inconsistency, incident angle and signal-to-noise ratio on bearing estimation with different types of signals are analyzed through simulation. Also the effectiveness of the correlated acoustic intensity method is verified and its application is discussed.
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