Research on DOA estimation method of single MEMS vector hydrophone based on pulse signal

Abstract

With the rapid development and wide application of Micro-Electro-Mechanical System (MEMS) vector hydrophones, it is of higher requirement for the estimation method of direction of arrival (DOA) for a single vector hydrophone in complex environments. Although many classical methods for DOA estimation have been proposed in this field, the DOA estimation method in complex environments, such as multipath effects and reverberation, still needs to be further studied. When the target DOA is estimated in the environment with reflected waves, certain errors will be caused due to the reflection provided that the continuous wave method is used. Moreover, the influence of the reflected wave can be decreased once the pulse wave method is used, but it will low the accuracy due to the poor Signal to noise ratio (SNR) problem simultaneously. For that reason, a solution method for DOA estimation using pulsed waves in a reflective environment has been proposed in this paper. The detailed arrangements of this paper are as follows: firstly, the orientation error caused by the low SNR of the pulsed waves was processed by the segmentation and extraction of the pulsed waves; secondly, the effectiveness of the proposed method was tested by experiments and made a DOA estimation error comparison with the classic continuous wave method; finally, the experimental results showed that when MEMS vector hydrophone DOA was estimated in the reflection environment, the estimation error caused by the reflected wave could be effectively reduced by the method proposed in this paper. A solution method for DOA estimation using pulsed waves in a reflective environment has been proposed in this paper. • A solution method for DOA estimation using pulsed waves in a reflective environment has been proposed in this paper. • The orientation error caused by the low SNR was processed by the segmentation and extraction of the pulsed waves. • The effectiveness of the proposed method was tested by experiments and made a comparison with the continuous wave method.