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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
SAR-mode retracking algorithm is a standard least squares estimator
consisting
in fitting a Doppler waveform with a multi-looked echo model that is
pre-computed off-line by a simulator. The main innovation of this
approach resides
in the generation of the echo model database in which the sensitive
parameters
(sea-state, satellite parameters) vary, one parameter at a time, in a
range of
values and with a step size, that have been chosen to ensure the
accuracy and
precision of the estimates. This numerical method is considered to be
more
robust than analytical ones, particularly when faced with atypical
observations
(e.g., elliptical antenna pattern, off-nadir mispointing angles, point
target
response) that are difficult to put into equations
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Data
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