- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE OCEANS 2018 MTS/IEEE Charleston - Charleston, SC, USA (2018.10.22-2018.10.25)] OCEANS 2018 MTS/IEEE Charleston - Optimal design of frequency-invariant beamformers for circular arrays
摘要： This paper proposes a optimal method designing frequency-invariant beamformers for circular arrays. First, the desired beampattern is expressed as a general complex-weighted form. Second, the weighting vectors at each frequency are accurately derived by approximating to the desired beampattern from the minimum mean square error perspective, all of which are found to be close-form functions of the desired complex weighting vectors. Third, a multiple optimization problem is formulated, and its solution gives the optimal desired weighting vector subject to different constraints. Finally, the weighting vectors at other frequencies can be directly computed based on the previously derived analytical functions. The proposed method provides flexible schemes to design different optimal frequency-invariant beamformers for circular sensor arrays. The good performance of the proposed method is demonstrated using simulations and experimental results.
关键词： circular sensor array,Frequency-invariant beamforming,multi-constraint optimization
更新于2025-09-23 15:22:29
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[IEEE 2017 51st Asilomar Conference on Signals, Systems, and Computers - Pacific Grove, CA, USA (2017.10.29-2017.11.1)] 2017 51st Asilomar Conference on Signals, Systems, and Computers - Frequency invariant beamforming for arbitrary planar arrays
摘要： In this paper, we present the adaptation to the least-square solution for frequency invariant beamforming to arbitrary planar arrays. This formulation is easily steerable thanks to the decoupling of spatial and spectral constraints. This is achieved with a basis of spherical harmonics polynomials, which parametrize the array response in a term dependent on frequency and a term dependent on the array geometry. Furthermore, the parametrization of the array response Bessel functions decouples the frequency term, which becomes independent of the geometry of the planar array, and allows steering in azimuth and elevation independently. The planar array response is approximated using virtual sensor modeling, which transform any two dimensional planar array in a virtual linear sensors, where azimuth and elevation are separable and can be steered independently.
关键词： frequency invariant beamforming,virtual sensor modeling,planar arrays,spherical harmonics
更新于2025-09-09 09:28:46