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The Beamforming Based on Vector-Sensor Array and Realization with DSP

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Tutor: QiuHongAn
School: Northwestern Polytechnical University
Course: Underwater Acoustics
Keywords: Vector Hydrophone,Narrowband beamforming,Broadband beamforming,Constant beamwidt
CLC: TB565.1
Type: Master's thesis
Year:  2007
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Abstract:
Vector hydrophone than traditional acoustic pressure the hydrophone has many advantages, it can space total points, simultaneous measurement of sound pressure and particle velocity orthogonal components, which contain the sound of the sound source strength and orientation information vector . Vector hydrophone than the traditional sound pressure hydrophone can measurements to get a fuller sound field information to improve traditional water sound measurement or detection equipment's performance, and resolve the actual sound of water issues to expand a new way of thinking, therefore vector hydrophone become one of the more active research directions in the field of array processing. The papers from the characteristics of vector hydrophone has introduced a single vector hydrophone beamforming, as the basis for in-depth study of vector hydrophone array narrowband and broadband constant beamwidth beamforming, and hardware This realization. The full text reads as follows: the vector hydrophone classification discussed in detail with vibration-type vector hydrophone and differential pressure vector hydrophone structure and working principle, and the derivation of the two vector hydrophone The formula is the target level of azimuth and elevation. 2 based on the characteristics of vector hydrophone has in-depth study of vector hydrophone narrowband beam shape. First analysis of a single vector hydrophone received signal model at different sound pressure, velocity combinations beamforming; followed by a detailed discussion of the vector hydrophone array narrowband beam formation, given arbitrary array received signal model and a detailed study of the different combinations of array beamforming. Finally, the vector hydrophone and conventional sound pressure hydrophone beamforming made emulation contrast, and add the signal to verify drawn vector hydrophone array beamwidth, sidelobe level and array gain are superior to conventional sound pressure hydrophone array. 3 study of the vector hydrophone broadband beamforming, a detailed discussion of the the weighted uniform linear array of broadband-based DC constant beam width beam formation (first to design the constant beamwidth weighted discrete frequency points, and then design the FIR filter to fit the discrete the frequency constant beamwidth represented amplitude and phase response, thus completing the time-domain constant beamwidth beamforming design); any hydrophone array, the application of semi-definite programming optimization method to design low sidelobe characteristics broadband constant beamwidth beamformer. 4 study vector hydrophone array broadband constant beamwidth beamforming hardware implementation. DSP processor centered around this focus, the overall design of the system, on the implementation details.
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