Investigation on Near-field Source Localization and the Corresponding Applications

Abstract : Source localization is a key technology in array signal processing, which is widely applied in radar, geologic prospecting, sonar, electronic surveillance, medical, electronics and other fields. Source localization can be classified into far-field source localization and nearfield source localization according to the distance between the sources and the array. Unlike the far-field situation, where each source is parameterized by only the DOA, the near-field signal wavefront is spherical, and both the DOAs and ranges are required to localize near-field sources. First, this dissertation concentrates on the improvements of the MUSIC-based method for near-field source localization. By making full use of the EVD, we make the proposal to estimate the DOAs and ranges in a decoupled way with only one matrix and one EVD. Then we propose a further improvement based on propagator methods. It allows to avoid the EVD and therefore leads to an even lower computational complexity. The third improvement is to increase the number of effective virtual sensors for the range estimation, which expands the aperture and achieves a notable improvement for the range estimation accuracy. In order to apply CS to near-field source localization, we propose a high-order CS method with a pairing step based on clustering. The proposed method can achieve better accuracy and resolution than traditional methods. This work ends with the application of GPR. An enhanced CS method is proposed to carry out the TDE directly in low SNR scenario.
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  • HAL Id : tel-01504375, version 1

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Jianzhong Li. Investigation on Near-field Source Localization and the Corresponding Applications. Electronics. UNIVERSITE DE NANTES, 2017. English. ⟨tel-01504375⟩

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