http://story.news.yahoo.com/news?tmpl=story&cid=96&ncid=96&e=1&u=/space/20030725/sc_space/gravitysrainbowgracemissionpushesforward

Gravity's Rainbow: GRACE Mission Pushes Forward

So anyway,

How do microwave rangefinders work?

Thanks

My only experience is with the ultrasonic and LED hobby stuff.

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