Off-Grid High Resolution DOA Estimation for GNSS Circular Array Receivers

Xiangrong Wang, Elias Aboutanios, Moeness Amin, Chow Yii Pui

Peer Reviewed

Abstract:	Direction of Arrival (DOA) estimation using antenna arrays is an important problem for combating jamming in GPS, as accurate DOA estimates lead to better interference suppression. In this paper, we improve the estimation DOA accuracy when the true incident angles are off the discretised sampling grid points. We propose a bisection interpolation method based on MUSIC pseudo-spatial spectrum coefficients. The proposed method can be applied to multiple uncorrelated sources in the field of view without any constraints on the antenna array shape. For coherent sources, both beamspace transformation and spatial smoothing are utilised to decorrelate the signals for uniform circular arrays, with sufficient number of antennas, prior to dichotomous search. Both simulated and experimental results validate the effectiveness and efficiency of the proposed algorithm.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	2260 - 2267
Cite this article:	Wang, Xiangrong, Aboutanios, Elias, Amin, Moeness, Pui, Chow Yii, "Off-Grid High Resolution DOA Estimation for GNSS Circular Array Receivers," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 2260-2267.
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