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Instrument: ALT (TOPEX) : TOPEX Radar Altimeter
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TOPEX Altimeter Sensor/Instrument:

The TOPEX altimeter is a dual frequency radar instrument which draws
upon a long heritage of single-frequency altimeters extending back to
Seasat. The primary channel for the altimeter is Ku-band (13.6 GHz),
and the secondary channel is C-band (5.3 GHz). Inclusion of the
secondary channel allows correction for propagation delays in the
ionosphere, reducing a significant error source in the measurement.
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