Experiences with ERS SAR Cross Image Spectra

Author: Harald Johnsen
address: NORUT IT, Tromsoe Science Park, N-9005 Tromsoe, Norway
e-mail: harald.johnsen@itek.norut.no
tlf: 47 776 29422
fax: 47 776 29401

Abstract:
The cross spectra methodology has been evaluated on ERS SAR Image Mode 
data with respect to the retrieval of the ocean wave spectrum. It is 
shown that the cross spectra methodology is superior to the standard 
image spectra in terms of propagation ambiguity resolution, speckle 
compensation and azimuth cut-off estimation. It is shown that within 
the spectral domain of the SAR, inversion can be performed without any 
a priori knowledge of the wave field. 
Potentials for application of multi-polarization cross spectra from 
future spaceborne SAR data are considered.


Keywords: SAR, Cross Spectra, Wave Spectra

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry