A Comparison of Surface Current Fields derived by Beam Forming and Direction
Finding Techniques as applied by the HF Radar WERA
K.-W. GURGEL, G. ANTONISCHKI, T. SCHLICK
IGARSS'97 Conference, Proceedings, pp. 1805...1807, 1997.
Abstract - -
HF radar in oceanography makes use of backscattering of electromagnetic waves
of 10 m to 50 m wavelength from the rough sea surface to measure surface
current and ocean wave parameters.
In Germany, the work on ground wave HF radar started in 1980, adopting
NOAA's CODAR (COastal raDAR).
Recent developments within the European project
SCAWVEX (Surface Current And Wave
lead to a new design called WERA (WEllen RAdar).
In Spring 1996, two WERA and CODAR systems have been
deployed north and south the Rhine mouth at the Dutch coast.
While CODAR uses a four-element squared receive antenna array and direction
finding technique for azimuthal resolution, WERA in addition can be
configured to use a linear array and beam forming. As both systems have been
operated simultaneously at the same location,
comparisons of the surface current fields
measured by the different systems and algorithms are possible.
By defining an absolute quality criterion based on spectral analysis of
current time series, limitations in the direction finding algorithm
concerning ship traffic can be identified.
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