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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Schulz-Stellenfleth, J. Lehner, S. Hoja, D. Koenig, T. |
| Copyright Year | 2002 |
| Description | Author affiliation: German Aerosp. Center, Oberpfaffenhofen, Germany (Schulz-Stellenfleth, J.; Lehner, S.; Hoja, D.; Koenig, T.) |
| Abstract | A parametric inversion scheme for the retrieval of two dimensional ocean wave spectra from look cross spectra (LCS) acquired by spaceborne synthetic aperture radar (SAR) is presented. The scheme takes information about the spectral shape of different wave systems from a prior wave spectrum, while estimates for wavelength, waveheight and wave propagation direction are extracted from SAR cross spectra. The Partition Rescaling and Shift Algorithm (PARSA) is based on a partioning of a prior wave spectrum, e.g. taken from ocean wave models. For each ocean wave system a stochastic model is set up, which defines the probability that the propagation direction, the wavelength or the energy of the different wave systems deviate from the prior knowledge. The prescribed probabilities thereby quantify the confidence into the prior wave spectrum. Based on the probability models for the prior wave spectrum and the measured cross spectrum an optimal ocean wave spectrum is estimated using a maximum a posteriori approach. To solve the corresponding minimization problem the prior model is approximated with a multivariate Gaussian model. The optimization problem is solved with a Gauss-Newton method. The scheme is tested using both simulated cross spectra and reprocessed wave mode data acquired by the ERS-2 SAR. The reprocessed data are similar to the products, which will be available from the ENVISAT satellite launched in March 2002. |
| Sponsorship | IEEE IEEE Geosci. & Remote Sensing Soc. Canadian Remote Sensing Soc. Univ. Waterloo Natural Resources Canada (NRCan) Canadian Space Agency (CSA) Environ. Canada NASA Nat. Oceanic & Atmos. Adm. (NOAA) Office of Naval Res.(ONR) Nat. Space Dev. Agency of Japan (NASDA) Nat. Polar-orbiting Environ. Satellite Syst. (NPOESS) |
| Starting Page | 2156 |
| Ending Page | 2158 |
| File Size | 346179 |
| Page Count | 3 |
| File Format | |
| ISBN | 078037536X |
| DOI | 10.1109/IGARSS.2002.1026477 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2002-06-24 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Ocean waves Information retrieval Spaceborne radar Synthetic aperture radar Spectral shape Data mining Partitioning algorithms Stochastic systems Sea measurements Wavelength measurement |
| Content Type | Text |
| Resource Type | Article |
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