A simple method for retrieving significant wave height from Dopplerized X-band radar
Retrieving spectral wave parameters such as the peak wave direction and wave period from marine radar backscatter intensity is very well developed. However, the retrieval of significant wave height is difficult because the radar image spectrum (a backscatter intensity variance spectrum) has to be tr...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-02-01
|
| Series: | Ocean Science |
| Online Access: | http://www.ocean-sci.net/13/95/2017/os-13-95-2017.pdf |
| _version_ | 1811268471097393152 |
|---|---|
| author | R. Carrasco M. Streßer J. Horstmann |
| author_facet | R. Carrasco M. Streßer J. Horstmann |
| author_sort | R. Carrasco |
| collection | DOAJ |
| description | Retrieving spectral wave parameters such as the peak wave direction and wave
period from marine radar backscatter intensity is very well developed.
However, the retrieval of significant wave height is difficult because the
radar image spectrum (a backscatter intensity variance spectrum) has to be
transferred to a wave spectrum (a surface elevation variance spectrum) using
a modulation transfer function (MTF) which requires extensive calibration for
each individual radar setup. In contrast to the backscatter intensity, the
Doppler velocity measured by a coherent radar is induced by the radial
velocity (or line-of-sight velocity) of the surface scattering and its
periodic component is mainly the contribution of surface waves. Therefore,
the variance of the Doppler velocity can be utilized to retrieve the
significant wave height. Analyzing
approximately 100 days of Doppler velocity measurements of a
coherent-on-receive radar operating at X-band with vertical polarization in
transmit and receive, a simple relation was derived and validated to retrieve
significant wave heights. Comparison to wave measurements of a wave rider
buoy as well as an acoustic wave and current profiler resulted in a root mean
square error of 0.24 m with a bias of 0.08 m. Furthermore, the different
sources of error are discussed and investigated. |
| first_indexed | 2024-04-12T21:23:29Z |
| format | Article |
| id | doaj.art-3df36aef92d045ea92f888eafcda9662 |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-04-12T21:23:29Z |
| publishDate | 2017-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-3df36aef92d045ea92f888eafcda96622022-12-22T03:16:15ZengCopernicus PublicationsOcean Science1812-07841812-07922017-02-011319510310.5194/os-13-95-2017A simple method for retrieving significant wave height from Dopplerized X-band radarR. Carrasco0M. Streßer1J. Horstmann2Department of Radar Hydrography, Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, GermanyDepartment of Radar Hydrography, Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, GermanyDepartment of Radar Hydrography, Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, GermanyRetrieving spectral wave parameters such as the peak wave direction and wave period from marine radar backscatter intensity is very well developed. However, the retrieval of significant wave height is difficult because the radar image spectrum (a backscatter intensity variance spectrum) has to be transferred to a wave spectrum (a surface elevation variance spectrum) using a modulation transfer function (MTF) which requires extensive calibration for each individual radar setup. In contrast to the backscatter intensity, the Doppler velocity measured by a coherent radar is induced by the radial velocity (or line-of-sight velocity) of the surface scattering and its periodic component is mainly the contribution of surface waves. Therefore, the variance of the Doppler velocity can be utilized to retrieve the significant wave height. Analyzing approximately 100 days of Doppler velocity measurements of a coherent-on-receive radar operating at X-band with vertical polarization in transmit and receive, a simple relation was derived and validated to retrieve significant wave heights. Comparison to wave measurements of a wave rider buoy as well as an acoustic wave and current profiler resulted in a root mean square error of 0.24 m with a bias of 0.08 m. Furthermore, the different sources of error are discussed and investigated.http://www.ocean-sci.net/13/95/2017/os-13-95-2017.pdf |
| spellingShingle | R. Carrasco M. Streßer J. Horstmann A simple method for retrieving significant wave height from Dopplerized X-band radar Ocean Science |
| title | A simple method for retrieving significant wave height from Dopplerized X-band radar |
| title_full | A simple method for retrieving significant wave height from Dopplerized X-band radar |
| title_fullStr | A simple method for retrieving significant wave height from Dopplerized X-band radar |
| title_full_unstemmed | A simple method for retrieving significant wave height from Dopplerized X-band radar |
| title_short | A simple method for retrieving significant wave height from Dopplerized X-band radar |
| title_sort | simple method for retrieving significant wave height from dopplerized x band radar |
| url | http://www.ocean-sci.net/13/95/2017/os-13-95-2017.pdf |
| work_keys_str_mv | AT rcarrasco asimplemethodforretrievingsignificantwaveheightfromdopplerizedxbandradar AT mstreßer asimplemethodforretrievingsignificantwaveheightfromdopplerizedxbandradar AT jhorstmann asimplemethodforretrievingsignificantwaveheightfromdopplerizedxbandradar AT rcarrasco simplemethodforretrievingsignificantwaveheightfromdopplerizedxbandradar AT mstreßer simplemethodforretrievingsignificantwaveheightfromdopplerizedxbandradar AT jhorstmann simplemethodforretrievingsignificantwaveheightfromdopplerizedxbandradar |