| Author: | Li, Yiu Lung |
| Title: | Direction finding using a pair of orthogonally orientated velocity/pressure sensors |
| Degree: | M.Sc. |
| Year: | 2013 |
| Subject: | Detectors. Hong Kong Polytechnic University -- Dissertations |
| Department: | Faculty of Engineering |
| Pages: | v, 27 leaves ; 30 cm. |
| Language: | English |
| Abstract: | An acoustic vector-sensor, also known as vector hydrophone, plays the main role in Direction-of-Arrival (DOA) estimation because acoustic vector-sensor measures the incident acoustic particle-velocity field for more accurate estimation and has smaller size than the traditional microphone. Typically, vector hydrophone is constituted by a triad of three identical acoustic particle-velocity sensors, which are orthogonally orientated but collocated at the Cartesian origin as a point-like geometry, plus an optional acoustic pressure sensor. There are only two unknowns to be estimated in the Angle-of-Arrival (AOA) Estimation, the elevation-angle-of-arrival (θ) from the positive z-axis and the azimuth-angle-of-arrival (α) measured from the positive x-axis. So, the number of sensors can be reduced to two, which can be a pressure sensor or particle-velocity sensors orientated on any Cartesian axis. In addition, complex and precise manufacture processes are required to compact all the particle-velocity sensors into a point-like geometry. If sensors are displaced, they are easier to be fabricated. Also, the separation between two sensors introduces a spatial phase factor, providing more direction information for estimation. Therefore a pair of displaced sensors is proposed in this dissertation for Angle-of-Arrival (AOA) Estimation in order to have a simpler sensor-array structure and lower hardware implantation cost. There exist 30 possible sensor pair configurations which have different sensors combinations at different spatial orientation. This dissertation introduces the closed-form formulas for each of these configurations to estimate the angle-of-arrival of incident source. The required prior information on the validity-regions for unambiguous estimation to the azimuth-elevation arrive-angle is also identified. |
| Rights: | All rights reserved |
| Access: | restricted access |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| b26434775.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.77 MB | Adobe PDF | View/Open |
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