| Providers may charge a premium on top of standard international call rates
for the convenience of being able to pull out a satellite cellphone instead
of having to borrow someone elses phone or use a calling card. What would
you be willing to pay for this convenience premium?
[ ]No more than standard international direct-dial rates
[ ]Up to 20% more than standard international direct-dial (IDD) rates
[ ]Up to 50% more than IDD rates
[ ]Double the price of IDD rates
[ ]Three times the price of IDD rates
[ ]More than three times the price of IDD rates
You may add a comment inside the square brackets:
[ ] |
| Hans-Georg, the Trimble page you have previously quoted says regarding the
errors, The errors theyre checking for are called ephemeris errors
because they affect the satellites orbit or ephemeris. These errors are
caused by gravitational pulls from the moon and sun and by the pressure of
solar radiation on the satellites.
Satellites at that altitude are NOT affected by atmosphere, nor do they
periodically fire small engines to raise their orbit.
The satellite orbit pertubations are caused by gravity and solar radiation. |
| If you were travelling somewhere you couldnt use your own cellphone, what
would offer you the best mix of price and convenience?
[ ] Using a calling card
[ ] Using a public, hotel or office phone
[ ] Renting a cellphone (with airport pickup and dropoff)
[ ] A satellite cellphone you brought with you
[ ] Your normal cellphone, equipped with a special card or chip
You may add a comment inside the square brackets:
[ ] |
| Satellites reach the end of their useful lives when they reenter
the earths atmosphere or their instruments fail. Many
satellites eventually fall out orbit and burn up as they reenter
the atmosphere. Others continue to orbit as space junk long
after their instruments have ceased working. Sometimes the
onboard rockets are purposely fired to slow a satellite and
cause it to reenter the earths atmosphere. |
| The research is based on the fact that several satellite consortiums are
launching systems that will let you make calls from around the world with a
hand-held satellite cellphone. Im trying to gather on-the-ground,
independent evidence on the preferences of technology-savvy consumers.
(Dont worry, Im not trying to sell you anything.) |
