压差式矢量水听器方位估计中的干扰抵消

Interference offset in DOA estimation with an pressure-gradient vector hydrophone

矢量水听器由于能获取声场中标量(声压)和矢量(振速)信息,因此单个的矢量水听器就可实现目标方位估计。单个矢量水听器是利用信号的声压和质点振速之间相关性进行信号方位估计,但是当存在干扰,并且干扰和信号之间相关时,如果对运用能量流进行方位估计的方法不加改进,则会出现很大的误差,甚至出现错误的估计。本文提出一种存在已知噪声干扰情况下的干扰抵消方法,并针对该方法进行了仿真试验,最后运用湖试数据进行了验证。结果表明,该方法能有效地减弱相干干扰对信号的影响,实现对信号的方位估计。

An acoustic vector hydrophone measures the scalar acoustic pressure and the vector acoustic particle velocity, thus the DOA can be estimated by single vector hydrophone. The correlation of the acoustic pressure and the acoustic particle velocity can be used to estimate DOA. Nevertheless, when there exits interference which is cor- related with the signal, an error or even a wrong estimation will arise if the algorithm of directional estimation by sound energy is not changed. In this paper, a method of interference offset in the presence of known noise interference is presented. Simulation and lake experiment show that proposed method can efficiently abate the influence of interference, and hence more correctly estimate the direction of object.