Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Mapping the current vector field by ship and shore based coherent radar

A coherent radar has the potential to acquire in addition to the signal's amplitude it's phase shift. By receiving the backscatter of a time series of signals from the phases the dominant frequency acquired for each "range bin" can be detected. This dominant frequency is effected by the Doppler shift due to relative movements between the antenna and the sea surface element, which scatters the radar signal.

In the application of a radar above water this frequency shift is effected by a series of influences. The most important influence is due to the wind locally acting on the sea-surface by friction and by producing the small capillary waves, which are the scatters for the x-band radar signal.

The method of "mapping the current vector field by ship and shore based coherent radar" bases on the "mapping the radial change in Doppler shift with a coherent radar".

There are two main differences:
1. To acquire the full current vector field two merged measurements of the radial Doppler shifts must be taken. The position of the pair of instruments must be chosen in a way to detect both components of the current vector in an area-covering field.
2. To extract the current field from the Doppler measurement the wind impact on the Doppler shift must be known and subtracted from the radial components before they can be combined for the vector detection.

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Max-Planck-Strasse 1
21502 Geesthacht
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