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Coverage: A small set of tracks located in the large
SAR area of the equatorial Pacific ocean
Time Period: May 2012
Cryosat-2 Data Products Used: CPP SAR
L1b Products Method:
The CPP RDSAR processing is based on the use of a two-step algorithm,
first reducing SAR mode raw data to RDSAR waveforms, and then applying
a conventional Brown ocean retracker to the RDSAR waveforms for
retreiving the different geophysical parameters. A 4-parameter
estimator is considered for adequately fitting the measured waveforms
with the return power model since the CryoSat-2 satellite exhibits
unstable off-nadir mispointing angle in flight. These parameters are
then corrected to account for the Gaussian approximation of the PTR in
the retracking algorithm scheme, the ellipticity of the CryoSat-2
antenna, and its particular speckle pattern, through pre-computed
Look-Up Tables (LUT).
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