Title: Experimental Investigation Of Sea Surface Motion Effects On SAR Derived Ocean Wave Spectra
Abstract: SUMMARY: One of the remaining problems in estimating properly the Ocean wave spectra using the principle of Synthetic Aperture Radar (SAR), is to understand the effects of sea surface motions on the SAR derived wave spectra. Motion of the scatterer on the sea surface during the SAR integration time may both be constructive as well as destructive in the imag$g process, depending on the radar and ocean wave parameters involved. The constructive effect (so called velocity bunching) contributes to the imaging of waves while the destructive effect degrades the image and reduces the azimuth resolution. The loss of azimuth resolution effectively performs an azimuth filtering which in the worse case may completely destroy the SAR derived ocean wave spectra. Theories postulate that the degradation is proportional to the range over velocity ratio (R/V) and the sea state. The objectives of this work are to experimentally investigate the sea surface motion effects on the SAR imaging of ocean waves. Especially, the FW and sea state dependencies will be investigated carefully. C- and X-band SAR data with different R/V ratio and under different sedweather conditions will be collected during the ERS-1 pre-launch experiment NORCSEX [IJ (march 1988) centered on Haltenbanken. Of particular interest is the SAR parameters corresponding to the ERS-1 SAR performance. In-situ Wavescan buoys data will be collected simultaneously for comparison with corresponding SAR derived parameters and for verification of sea and weather conditions. Optimal estimates of the directional long gravity Ocean wave spectra will be computed according to the method described in ref.[2]. Parameters such as significant waveheight, mean wave direction and length, wave direction and length at spectral peak and unidirectivity will be extracted from the digitally processed SAR wave spectra. Comparison with the Corresponding Wavescan buoy data will be performed for different R/V and sedweather conditions. A detailed description of the NORCSEX campaign Operational Plan is given in ref.[l].
Publication Year: 2005
Publication Date: 2005-08-24
Language: en
Type: article
Indexed In: ['crossref']
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