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Sensors 2016, 16(7), 1031; doi:10.3390/s16071031

A Channelization-Based DOA Estimation Method for Wideband Signals

Science and Technology on Automatic Target Recognition Laboratory (ATR), National University of Defense Technology, Changsha 410073, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 4 May 2016 / Revised: 12 June 2016 / Accepted: 28 June 2016 / Published: 4 July 2016
(This article belongs to the Section Physical Sensors)

Abstract

In this paper, we propose a novel direction of arrival (DOA) estimation method for wideband signals with sensor arrays. The proposed method splits the wideband array output into multiple frequency sub-channels and estimates the signal parameters using a digital channelization receiver. Based on the output sub-channels, a channelization-based incoherent signal subspace method (Channelization-ISM) and a channelization-based test of orthogonality of projected subspaces method (Channelization-TOPS) are proposed. Channelization-ISM applies narrowband signal subspace methods on each sub-channel independently. Then the arithmetic mean or geometric mean of the estimated DOAs from each sub-channel gives the final result. Channelization-TOPS measures the orthogonality between the signal and the noise subspaces of the output sub-channels to estimate DOAs. The proposed channelization-based method isolates signals in different bandwidths reasonably and improves the output SNR. It outperforms the conventional ISM and TOPS methods on estimation accuracy and dynamic range, especially in real environments. Besides, the parallel processing architecture makes it easy to implement on hardware. A wideband digital array radar (DAR) using direct wideband radio frequency (RF) digitization is presented. Experiments carried out in a microwave anechoic chamber with the wideband DAR are presented to demonstrate the performance. The results verify the effectiveness of the proposed method. View Full-Text
Keywords: digital array radar; direction of arrival (DOA) estimation; wideband signal; digital channelization receiver digital array radar; direction of arrival (DOA) estimation; wideband signal; digital channelization receiver
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guo, R.; Zhang, Y.; Lin, Q.; Chen, Z. A Channelization-Based DOA Estimation Method for Wideband Signals. Sensors 2016, 16, 1031.

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