What is WERA ?
Until 1996 the University of Hamburg HF-Radar group has been using a modified
CODAR , which e.g. did not allow access to the
second-order sidebands in the
To overcome these limitations, a new
HF-radar we named WERA (WEllen RAdar) has been designed to
allow for a wide range of working frequencies, spatial resolution,
and antenna configutarions. The main advantages of WERA include:
- Simultanous measurement of current and wave maps.
- Different receiving antenna designs (4 to 16 antennas) in combination with
direction finding and beam forming techniques for azimuthal
resolution. Here is a picture of the
16-element linear array, which is
needed for ocean surface current and wave measurement
and this picture shows the
4-element square array, which can be
used for ocean surface current measurement only.
- Frequency chirp continuous wave modulation (FMCW)
- to avoid a blind range in front of the radar,
- to simply modify the radar's range resolution down to 300 m,
- to reduce the impact of radio interference.
- The radar is linked to a Unix workstation for data management
- 90% of the signal processing steps are implemented in software and
thus can be modified or updated in a simple way.
- WERA is a very modular design, which can be easily adopted to different
- This is an example showing a coastal jet in front of the Dutch coast at
1.2 km resolution mode.
An area up to 50 km off the coast can be covered.
- A similar situation measured at
300 m resolution mode
can be seen in this example.