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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.

The ALT was developed and built by the Applied Physics Laboratory of
the John Hopkins University (APL/JHU) under contract to the Wallops
Flight Facility of NASA's Goddard Space Flight Center (GSFC) on behalf
of JPL.

Additional information available at

[Summary provided by NASA]