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A higher-order "figure-8" sensor and an isotropic sensor-For azimuth-elevation bivariate direction finding.
Muhammad Muaz1, Yue Ivan Wu2, Kainam Thomas Wong1
1Department of Electronic & Information Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region.
The Journal of the Acoustical Society of America
|May 3, 2018
Summary
This study introduces a novel higher-order pressure-velocity (p-u) probe for improved direction finding. Signal processing algorithms and Cramér-Rao lower bounds were developed and validated for this advanced acoustic sensing system.
Area of Science:
- Acoustics
- Signal Processing
- Sensor Technology
Background:
- Traditional p-u probes use isotropic pressure sensors and uni-axial figure-8 particle-velocity sensors.
- Higher-order directivity in p-u probes has not been explored in the open literature.
- Spatially displaced sensors within the probe are permissible.
Purpose of the Study:
- To develop signal processing algorithms for direction finding using a generalized higher-order p-u probe.
- To analytically derive the Cramér-Rao lower bounds (CRB) for this new sensing system.
- To validate the performance of the direction-of-arrival estimators through simulations.
Main Methods:
- Development of closed-form eigen-based signal processing algorithms.
- Analytical derivation of CRB, considering sensor geometry and directivity order.
- Monte Carlo simulations to assess estimator efficacy and proximity to CRB.
Main Results:
- Novel algorithms for azimuth-elevation direction finding were successfully developed.
- CRB were derived, explicitly linking performance to sensor characteristics.
- Simulations confirmed the high accuracy and efficiency of the proposed direction-finding estimators.
Conclusions:
- The higher-order p-u probe offers a promising advancement in acoustic direction finding.
- The developed algorithms and CRB provide a theoretical framework for performance evaluation.
- This research opens new avenues for advanced acoustic sensing applications.