How does the TOPEX satellite obtain data about the ocean?

Question by guitargirlplayer13: How does the TOPEX satellite obtain data about the ocean?
Please answer my question. I am doing a report for school( yea i am still in school, im homeschooled, we get out on June 30th im in the eighth grade, im going to the ninth. )
Thanks for ur help yall! Have a great summer.

Best answer:

Answer by Rescue76
NASA’s TOPEX satellite sends out radar pulses and measures the time of the return reflection from the nearest surface, which, over ocean, is directly below the satellite….Example….. A region of ocean approximately 10 km in radius contributes to the measured return, and the accuracy of an individual height measurement is about 13 cm……..With an accurate knowledge of the orbit, the actual ocean height is then found.

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