【作者】 蔡宗义； 许学忠； 董明荣； 李家武；

【Author】 CAI Zong-yi,XU Xue-zhong,DONG Ming-rong,LI Jia-wu (Acoustics Engineering Research Center,Northwest Institute of Nuclear Technology,Xi’an,710024,China)

【机构】 西北核技术研究所声能工程研究中心；

【摘要】 对由四个声压传声器组成的空气声压差式矢量传感器的指向性进行了研究。采用实测的低空目标信号进行了外场实验,通过分析给出了压差式矢量传感器的质点粒子速度和声强的指向性。结果表明,压差式矢量传感器的指向性基本保持了"8"字形的指向特证,并且沿两个正交坐标轴的指向性的正交性较好。从整体上看,声强的指向性要明显优于质点粒子速度的指向性。该研究结果说明,压差式矢量传感器技术完全可以用于对地面和低空目标的定向。为了提高定向精度,在实际应用中应采用声强定向技术。更多还原

【Abstract】 the directivity of pressure-gradient aero-acoustic vector sensor composed of four pressure microphones is studied in the paper.Experiment is carried out in an open field using the real signal measured from a low altitude target,and the directivities of particle velocity and sound intensity are gained by analyzing the experimental results.The results show that the directivity of aero-acoustic vector sensor basically keeps the characteristic of the dipole directivity,and its directivity along the orthogonal axis has a good orthogonality.On the whole,the directivity of sound intensity is obviously better than the directivity of particle velocity.The research results indicate that the technique of aero-acoustic vector sensor could be absolutely used to estimate the direction of the low altitude target and ground target.In order to improve the precision of bearing finding,the method of direction finding used in practice should choose the bearing finding technique based on sound intensity.更多还原