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Title: Improving Surface Current Resolution Using Direction Finding Algorithms for Multiantenna High-Frequency Radars
Abstract

While land-based high-frequency (HF) radars are the only instruments capable of resolving both the temporal and spatial variability of surface currents in the coastal ocean, recent high-resolution views suggest that the coastal ocean is more complex than presently deployed radar systems are able to reveal. This work uses a hybrid system, having elements of both phased arrays and direction finding radars, to improve the azimuthal resolution of HF radars. Data from two radars deployed along the U.S. East Coast and configured as 8-antenna grid arrays were used to evaluate potential direction finding and signal, or emitter, detection methods. Direction finding methods such as maximum likelihood estimation generally performed better than the well-known multiple signal classification (MUSIC) method given identical emitter detection methods. However, accurately estimating the number of emitters present in HF radar observations is a challenge. As MUSIC’s direction-of-arrival (DOA) function permits simple empirical tests that dramatically aid the detection process, MUSIC was found to be the superior method in this study. The 8-antenna arrays were able to provide more accurate estimates of MUSIC’s noise subspace than typical 3-antenna systems, eliminating the need for a series of empirical parameters to control MUSIC’s performance. Code developed for this research more » has been made available in an online repository.

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Authors:
 ;  ;  ;  
Award ID(s):
1658475 1657896 1831937 1736709
Publication Date:
NSF-PAR ID:
10121038
Journal Name:
Journal of Atmospheric and Oceanic Technology
Volume:
36
Issue:
10
Page Range or eLocation-ID:
p. 1997-2014
ISSN:
0739-0572
Publisher:
American Meteorological Society
Sponsoring Org:
National Science Foundation
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