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How long would GPS last if unmaintained?

#1 User is offline   nincehelser 

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Posted 16 July 2003 - 09:02 AM

I posted this question in another thread, but it probably better belongs here.

After seeing a recent movie (28 Day After) I was wondering this:

Suppose something happened where the GPS system could no longer be maintained...no monitoring, no corrections, no updates...complete silence from the earth...the sats are completely on their own.

How long could the GPS system remain functional or reliable? Hours, Days, Weeks, Longer?

Thanks
George

#2 User is offline   Kerry. 

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Posted 16 July 2003 - 09:39 AM

The block IIA sats are designed to provide 180 days of operation without Control Segment contact. However over this time accuracy will slowly degrade.

The current generation block IIR sats of which there are 8 in orbit (more to follow) are designed for 14 days non contact in standard mode and up to 180 days in autonmous navigation mode. In this auto mode direct communication between each of the block IIR's maintain system parameters.

Apart from the main control centre at Schriver, there is also a backup Control centre away from Schriver that operates 4 times a year to ensure readiness as well as the pre-launch satellite check-out facility at Cape Canaveral that can act in a limited control role.

Cheers, Kerry.

I never get lost Posted Image everybody keeps telling me where to go Posted Image

#3 User is offline   st_richardson 

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Posted 16 July 2003 - 10:40 AM

It's amazing the wealth of knowledge available on this forum. I would of thought a question like that would of gone unanswered for awhile.

Instead we have an informed response in about a half an hour.

#4 User is offline   jollybgood 

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Posted 16 July 2003 - 11:51 AM

I would think replacing the double A's in those sats would be a pain in the butt.

Jolly R. Blackburn
http://kenzerco.com
"Never declare war on a man who buys his ink by the gallon."

#5 User is offline   wickedsprint 

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Posted 16 July 2003 - 11:51 AM

I was wondering the same thing, after reading "the stand", made me wonder how long I could remain unlost...oh well..I thought would have been longer...now what they need is a mini Inertial Nav setup...that would be badass.

#6 User is offline   TNRonin 

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Posted 16 July 2003 - 02:00 PM

Good info, merci buckets!



#7 User is offline   Team GeoCan 

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Posted 16 July 2003 - 02:39 PM

The whole system would be GONE in a few years if all contact was lost, No orbit corrections, means orbital decay.

Eventually they all re-enter.

But then if NO signal up, who is DOWN to use them?



Trash-out, EVERYtime

#8 User is offline   hutchca 

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Posted 17 July 2003 - 02:38 AM

What if all the control segment equipment was operational but no people at the controls?
All the computers and the uplink still running, just no manual input.
I imagine most of the data and corrections sent from the control station are automated.

[This message was edited by Chuck & Kris on July 17, 2003 at 10:54 AM.]

#9 User is offline   TEAM 360 

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Posted 17 July 2003 - 07:09 AM

OH MY GOD! That would mean I have to learn how to use one of those....I mean....a...a...MAP! AAAAAHHHHHHHHH!! NOOOOOOOOOOOOOOO!!!

#10 User is offline   Renegade Knight 

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Posted 18 July 2003 - 12:34 PM

quote:
Originally posted by TEAM 360:
OH MY GOD! That would mean I have to learn how to use one of those....I mean....a...a...MAP! AAAAAHHHHHHHHH!! NOOOOOOOOOOOOOOO!!!


Don't worry. If society is that far gone you will be more interested in if the dude approaching you is on your kill on sight because it would make your life easier list.

Besides if you run out of bullets you can beat him to death with your GPS.

#11 User is offline   The Falcon 

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Posted 19 July 2003 - 10:15 AM

[QUOTE]Originally posted by wickedsprint:
I was wondering the same thing, after reading "the stand"...QUOTE]
Someone should make multis of all the trips of the main characters.

=====
It is the tale, not he who tells it."

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