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Poseidon.graphic.jpg(652 × 527 pixels, file size: 66 KB, MIME type: image/jpeg)

Summary

Description The accurate determination of the ocean height is made by first characterizing the precise height of the spacecraft above the center of the Earth. This is achieved through a technique called "precise orbit determination," of which satellite-tracking information is the most important ingredient.The second component of the ocean height measurement is the range from TOPEX/Poseidon to the ocean surface. TOPEX/Poseidon carried two radar altimeters for providing this information. To take a measurement, an onboard altimeter bounces microwave pulses off the ocean surface and measures the time it takes the pulses to return to the spacecraft.
Source

NASA/JPL

http://topex-www.jpl.nasa.gov/technology/technology.html
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Licensing

Public domain
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Date/TimeThumbnailDimensionsUserComment
current01:46, 27 May 2008Thumbnail for version as of 01:46, 27 May 2008652 × 527 (66 KB)Rsullivant{{Information |Description =The accurate determination of the ocean height is made by first characterizing the precise height of the spacecraft above the center of the Earth. This is achieved through a technique called "precise orbit determination," of wh
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