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The University of Hamburg WERA HF Radar - Theory and Solutions
Presented at the Radiowave Oceanography Workshop 2001
Klaus-Werner Gurgel , H.-H. ESSEN and T. SCHLICK
University of Hamburg, Institute of Oceanography,
Tropolwitzstrasse 7, D-22529 Hamburg, Germany.
AbstractThe remote sensing group of the University of Hamburg is working on HF radar since 1980. Based on 15 years of experience with CODAR, which the University of Hamburg bought from NOAA (developed by D. Barrick), a new system called WEllen RAdar (WERA) has been designed at the University of Hamburg. The design aims to be as flexible as possible in order to allow easy adjustment to different requirements, i.e. working range, spatial resolution and antenna configurations.
The first part of this paper deals with the physics involved in HF radar techniques, which includes the influence of working frequency, salinity and sea state on working range, spatial resolution and interference.
The second part describes the technical solutions available to achieve resolution in range and azimuth. Modulation techniques for range resolution like Pulses and Frequency Modulation (FMCW) are compared, as well as Direction Finding and Beam Forming for azimuthal resolution. A short introduction in the algorithms needed is given.
The third part shows the components available from the WERA 'kit', to put together an HF radar adopted to the requirements of the actual application. Several compromizes must be met, e.g. between available ground and working frequency restricting the antenna design.
This work has been funded by the European Commision DG XII within the MAST-3 programme, project EuroROSE, CT98-0168.