Re: Kiss your GPS units goodbye.. China destroys Satellite with missile
I don't really understand why I should be kissing my GPS goodbye. OK, so
China has the capability to attack (at least some types of) Satellite. I
would actually find it marginally more surprising to learn they hadn't.
If I saw you using your GPS in the field, I have the capability to come and
smash it. I'm not going to, though.
I should perhaps add that in the unlikely case that China (or anyone else)
_did_ start knocking out another state's satellites, I think I'd have more
pressing concerns on my mind than a potential disruption to the consumer GPS
service.
Keith
.
Relevant Pages
- Re: NEW GPS with the best sensitivity of antenna!!!
... > I have head that under tree cover after rain GPS doesn't work. ... the geometry of the satellites being used with respect to receiver ... diffraction, ans scattering of the satellite signal by trees, utility ... Satellite clock--Errors in the transmitted clock, ...
(sci.geo.satellite-nav) - Re: The physics of music.
... changing synchronization corrections for each clock exist such that the ... that the GPS continues to operate with great accuracy has in fact ... relativity in the global positioning system, ... The design life of each satellite is 7.5 years.) ...
(sci.physics) - Re: GPS Tip: Why does a GPS need to know where it is before it can compute where it is?
... This does seem strange but for the quickest fix a GPS depends on knowing the approximate location and the current time. ... This is due to the fact that the satellites are all broadcasting on the same frequency and in order to lock on to a particular one it uses knowledge of the current satellite locations in the sky and orbit data to provide a lock. ... Note that after the fix is calculated the GPS will use the Doppler data to calculate the current velocity. ... Almanac data is used by GPS receiver to assign PRN codes to ...
(sci.geo.satellite-nav) - Re: The Speed of Gravity =?windows-1252?Q?=96_What_the_Exp?= =?windows-1252?Q?eriments_Say?=
... continually changing synchronization corrections for each clock exist such that the predictions of SR are fulfilled for any local co-moving frame. ... To avoid the embarrassment of that complexity, GPS analysis is now done exclusively in the Earth-centered inertial frame. ... And the pre-launch adjustment of clock rates to compensate for relativistic effects then hides the fact that all orbiting satellite clocks would be seen to tick slower than ground clocks if not rate-compensated for their orbital motion, and that no reciprocity would exist when satellites view ground clocks. ... Now, if one can provide a way for a ground receiver to synchronize its clock with the satellite clock, a simple measurement of the time delay in the signal received from a satellite in view of the Earthbound user, should result in a precise range to that satellite. ...
(sci.physics) - Schriever AFB Airmen assume GPS satellite responsibilities (Forwarded)
... the day after the launch of GPS IIR-M 14 in 2005. ... satellites launched less than 10 years ago, ... 1st SOPS is the only squadron of its kind in Air Force Space Command. ...
(sci.space.news) |
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