Altimetric type measurement method for use on a satellite
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United States of America Patent
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Jul 13, 1999
Grant Date -
N/A
app pub date -
Feb 21, 1997
filing date -
Feb 23, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An altimetric type measurement method for use on a satellite transmits a pulse towards the surface of the sea and carries out frequency transformation on the return signal resulting from the reflection of this pulse at the surface of the sea. This produces a spectral signal of samples successively comprising: (a)--a first zone with a low amplitude level, (b)--a second zone with a sharply increasing slope ending at a peak, and (c)--a third zone of decreasing slope. Samples of the spectral signal are selected within a selection zone that corresponds to the first and second zones for a predetermined maximal level of the height of the waves at the surface of the sea and maximum likelihood processing is applied only to the selected samples.
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