Abstract
The modulation of the radar backscatter by long ocean waves can, to first order, be described by a linear modulation transfer function (MTF). The complex MTF can be separated into a part describing purely geometrical effects and the `hydrodynamic MTF' resulting from the modulation of short surface waves by longer waves. According to previous theories, the hydrodynamic MTF should be independent of the radar polarization. Experimental results show that this is not valid. Furthermore, the measured hydrodynamic MTFs for high radar frequencies (e.g., X-band) are often larger than expected. We show that these effects can be basically explained by a three-scale composite surface model, which takes into account the second-order modulation of the radar backscatter by intermediate-scale surface waves. Furthermore, the proposed model includes a modulation of the wind stress over the long surface waves.
| Original language | English (US) |
|---|---|
| Title of host publication | International Geoscience and Remote Sensing Symposium (IGARSS) |
| Editors | Sadao Fujimura |
| Publisher | Publ by IEEE |
| Pages | 765-767 |
| Number of pages | 3 |
| Volume | 2 |
| ISBN (Print) | 0780312406 |
| State | Published - 1993 |
| Externally published | Yes |
| Event | Proceedings of the 13th Annual International Geoscience and Remote Sensing Symposium - Tokyo, Jpn Duration: Aug 18 1993 → Aug 21 1993 |
Other
| Other | Proceedings of the 13th Annual International Geoscience and Remote Sensing Symposium |
|---|---|
| City | Tokyo, Jpn |
| Period | 8/18/93 → 8/21/93 |
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ASJC Scopus subject areas
- Software
- Geology
Cite this
Hydrodynamic ocean wave-radar modulation transfer functions obtained from a three-scale composite surface model. / Romeiser, Roland; Schmidt, Anke; Wismann, Volkmar; Alpers, Werner.
International Geoscience and Remote Sensing Symposium (IGARSS). ed. / Sadao Fujimura. Vol. 2 Publ by IEEE, 1993. p. 765-767.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Hydrodynamic ocean wave-radar modulation transfer functions obtained from a three-scale composite surface model
AU - Romeiser, Roland
AU - Schmidt, Anke
AU - Wismann, Volkmar
AU - Alpers, Werner
PY - 1993
Y1 - 1993
N2 - The modulation of the radar backscatter by long ocean waves can, to first order, be described by a linear modulation transfer function (MTF). The complex MTF can be separated into a part describing purely geometrical effects and the `hydrodynamic MTF' resulting from the modulation of short surface waves by longer waves. According to previous theories, the hydrodynamic MTF should be independent of the radar polarization. Experimental results show that this is not valid. Furthermore, the measured hydrodynamic MTFs for high radar frequencies (e.g., X-band) are often larger than expected. We show that these effects can be basically explained by a three-scale composite surface model, which takes into account the second-order modulation of the radar backscatter by intermediate-scale surface waves. Furthermore, the proposed model includes a modulation of the wind stress over the long surface waves.
AB - The modulation of the radar backscatter by long ocean waves can, to first order, be described by a linear modulation transfer function (MTF). The complex MTF can be separated into a part describing purely geometrical effects and the `hydrodynamic MTF' resulting from the modulation of short surface waves by longer waves. According to previous theories, the hydrodynamic MTF should be independent of the radar polarization. Experimental results show that this is not valid. Furthermore, the measured hydrodynamic MTFs for high radar frequencies (e.g., X-band) are often larger than expected. We show that these effects can be basically explained by a three-scale composite surface model, which takes into account the second-order modulation of the radar backscatter by intermediate-scale surface waves. Furthermore, the proposed model includes a modulation of the wind stress over the long surface waves.
UR - http://www.scopus.com/inward/record.url?scp=0027847927&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027847927&partnerID=8YFLogxK
M3 - Conference contribution
SN - 0780312406
VL - 2
SP - 765
EP - 767
BT - International Geoscience and Remote Sensing Symposium (IGARSS)
A2 - Fujimura, Sadao
PB - Publ by IEEE
ER -