[FOSS-GPS] GPS in space?

[Risto H. Kurppa]

Found this article from 2002:
http://www.technologyreview.com/communications/12714/

In September, the amateur satellite AO-40, in cooperation with NASA,
successfully detected a GPS signal at an altitude of 52,000
kilometers. Because GPS satellites only beam their transmissions
toward the earth, AO-40 had to rely on small portions of beams that
made it past the earth from satellites on the other side of the
planet, up to 70,000 kilometers away.

and

Eventually, GPS could prove itself at even higher heights. San
Diego-based TransOrbital plans to include a GPS experiment on
TrailBlazer, an unmanned commercial lunar mission scheduled for launch
in mid-2002. That experiment will test the ability to use GPS signals
for navigation as far away as the moon, about 385,000 kilometers away.


r

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