Research On Signal Processing Of Acoustic Vector Sensor

Study on acoustic vector sensor signal processing is one of the most attractive fields of underwater acoustic engineering. Analyzing and processing the datas measured by acoustic vector sensor is the key to make its advantages. Acoustic vector sensor measures the acoustic pressure and all three components of the acoustic particle velocity at a single point in space. So the technique of vector sensor signal processing is better in performance and more various than traditional pressure sensor signal processing. This thesis considering of engineering applications, reserch the technique of acoustic vector sensor signal processing. Via theoretic deducing, simulating on computer and analyzing data of trials in lake and sea, this thesis emphasizes on single vector sensor signal processing and space spectrum estimation of vector sensor arrays.Single acoustic pressure sensor can not determine the direction of arrival (DOA), but single vector sensor can distinguish multi-sources because of its inherent directional sensitivity. Since the multi-sources resolving ability by single-vector sensor is not satisfied enough, this thesis lucubrates how to increase it, especially in coherent case. A new approach to single acoustic vector sensor called double frequency narrow-band beamforming is presented in the thesis, and the beamwidth is 26° (-3dB). Computer simulations and trials in sea show that it can distinguish multi-sources primarily. Owing to the fact that different underwater acoustic targets are different in their DEMON line-spectra, they can be resolved in DEMON spectrum. Analytic acoustic intensity flux (AAIF) is brought forward in the thesis, and single vector sensor DEMON line-spectra detection...