Theoretical and Experimental Exploration on Two-Dimensional DOA Estimation for Low Frequency Sound Source with Non-typical Vector Acoustic Intensity Array
三轴四元非典型声强向量阵对低频声源全空间定向的理论与实验研究

A new method of two-dimensional DOA (Direction of Arrival) estimation for low frequency sound source with the non-typical vector acoustic intensity array of small size is proposed. This array consists of 4 sensors on the 3 orthogonal axes, so as to measure the 3 components of the vector acoustic intensity. The azimuth and pitch angles of the sound source can be estimated from the 3 intensity components. The estimation errors, including the finite difference approximation error (FDAE), the instrumentation channel mismatch error (ICME), and the error caused by ambient noise, are studied systematically. Experiments conducted in semi-anechoic chamber show that, after correcting the FDAE and ICME, the precision of DOA estimation in isotropic ambient noise is about 1o. Both theoretical analysis and experimental results validate the effectiveness of this method.