Ultra-short baseline positioning basing on error equalization in a five-element stereo array

WANG Hongru; WANG Zhongqiu; QI Suiping; HU Tong; ZOU Jing; CAO Zili

doi:10.16511/j.cnki.qhdxxb.2018.21.009

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (6) : 553-557. DOI: 10.16511/j.cnki.qhdxxb.2018.21.009

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Ultra-short baseline positioning basing on error equalization in a five-element stereo array

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Abstract

Ultra-short baseline positioning using a single-plane base array will lead to increased positioning errors when the acoustic source is close to the plane of the base array. This paper presents a method to reduce the error using different array planes which can be localized in one stereo five-element array. The stereo array can be divided into several sub-arrays having three basic elements in different orthogonal directions. The positioning data in the local coordinate system of the sub-array is first translated into the global coordinate system of the entire stereo array by a transformation matrix with a weighted average then calculated with the weighting based on the positioning error which is related to the change in the elevation angle in the local coordinate system of the sub-array. Simulations in MATLAB showed that this method can realize positioning localization of a spatially azimuthal target sound source. The positioning accuracy is more than 4 times higher than for a single array because the relative positioning error from all directions of the stereo array is smoothed due to the different elevation angles. Thus, this method significantly reduces the positioning error when the pitch angle of the sound source is close to the single base array plane.

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ultra-short baseline positioning / five-element stereo array / error equalization

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WANG Hongru, WANG Zhongqiu, QI Suiping, HU Tong, ZOU Jing, CAO Zili. Ultra-short baseline positioning basing on error equalization in a five-element stereo array[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(6): 553-557 https://doi.org/10.16511/j.cnki.qhdxxb.2018.21.009

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