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Sensors 2011, 11(5), 4780-4793; doi:10.3390/s110504780

Adaptive Sparse Representation for Source Localization with Gain/Phase Errors

Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
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Author to whom correspondence should be addressed.
Received: 14 February 2011 / Revised: 11 April 2011 / Accepted: 12 April 2011 / Published: 2 May 2011
(This article belongs to the Section Physical Sensors)
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Abstract

Sparse representation (SR) algorithms can be implemented for high-resolution direction of arrival (DOA) estimation. Additionally, SR can effectively separate the coherent signal sources because the spectrum estimation is based on the optimization technique, such as the L1 norm minimization, but not on subspace orthogonality. However, in the actual source localization scenario, an unknown gain/phase error between the array sensors is inevitable. Due to this nonideal factor, the predefined overcomplete basis mismatches the actual array manifold so that the estimation performance is degraded in SR. In this paper, an adaptive SR algorithm is proposed to improve the robustness with respect to the gain/phase error, where the overcomplete basis is dynamically adjusted using multiple snapshots and the sparse solution is adaptively acquired to match with the actual scenario. The simulation results demonstrate the estimation robustness to the gain/phase error using the proposed method.
Keywords: direction-of-arrival estimation; adaptive sparse representation; adaptive overcomplete basis learning direction-of-arrival estimation; adaptive sparse representation; adaptive overcomplete basis learning
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Sun, K.; Liu, Y.; Meng, H.; Wang, X. Adaptive Sparse Representation for Source Localization with Gain/Phase Errors. Sensors 2011, 11, 4780-4793.

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