Seawave Measurements using a Ships Radar
conference paper
The directional spectrum of a wavefield can be determined from a ships radar image with 180 degree ambiguity. The nondirectional waveheight spectrum follows by integration over all azimuth angles. These spectra are influenced by noise and interference from several sources, such as speckle, wind influence and shadowing (especially at long ranges and small grazing angles). The dispersion relation for gravity waves gives the relation between the time and spatial dependence of seawaves. The radar can be used to record data-series in both time and place. Using the dispersion relation the data can be filtered. The resulting spectra are much cleaner and compare better with wave spectra from traditional instruments. In addition, the watercurrent and the waterdepth may be estimated.
TNO Identifier
230251
Publisher
ESA
Source title
Proceedings of IGARSS '86 Symposium: Remote Sensing, Today's Solutions for Tomorrow's Information Needs, 8-11 September, 1986, Zurich, Switserland
Place of publication
Noordwijk
Pages
819-823