The first Challenger flight was in 1983 for STS-6, so this must have been Columbia. I don't recall the SRB burnthroughs that you mentioned, though. They have lost some SRBs due to parachute failures, but that's hardly the same problem!
The two primary reasons, I believe, are that GEO would leave some locations at high latitudes with poor or non-existent coverage, and having vehicles visible in different directions relative to the user provides better geometry for calculating the user's position. If all of the vehicles are in the same direction (ie, toward the equator), there is a higher error than if the vehicles are widely spaced.
The orbit is designed so that each vehicle's ground track repeats (almost) exactly, twice per sidereal day.
I am sure that there are other good reasons, such as trying to avoid having the navigation signal go through some of the nastier regions of near-earth space.
Actually, it will appear as PRN (pseudo-random noise) #17 on receiving equipment. That PRN is currently unused. The current vehicle in slot C4 is PRN07, and it will keep that PRN assignment until it is decommissioned by the USAF.
That's not entirely true. SA (Selective Availability) will affect only GPS, not GLONASS or Galileo. They can no doubt jam the others, though.
And the newer satellites most certainly do have SA. SA was turned off (set to zero) back in 2000. At that time, the GPS Block IIR satellites were the most modern, and that is still the case. The capability still exists to reactivate SA if desired.
The next new hardware, GPS Block IIF is scheduled to begin launches in a few years. I do not know whether they also have SA capability, but I would be shocked if they did not.
Sadly, I have paraphrased both of your examples within the past week. However, your point is a good one. Not only has MP held up over time, but most people who enjoy it don't seem to mind watching again and again...
Likewise our shop (less than 8000 but still big). However, I do know that they are planning to roll out XP in the near future. If they are going to do so, hopefully they will be alert enough to wait until SP2 arrives so that the pain can be inflicted once instead of twice.
Gee, I still had Netscape 4.8 (?) on my machine until last week (along with Mozilla). I finally uninstalled Netscape when I decided I liked Firefox. I never thought I was a die-hard, other than simply [b]not[/b] wanting to use IE.
Slashdot Mirror
The first Challenger flight was in 1983 for STS-6, so this must have been Columbia. I don't recall the SRB burnthroughs that you mentioned, though. They have lost some SRBs due to parachute failures, but that's hardly the same problem!
Actually, I think it is closer to 80%.
They actually got photos of Area 51-A.
The orbit is designed so that each vehicle's ground track repeats (almost) exactly, twice per sidereal day.
I am sure that there are other good reasons, such as trying to avoid having the navigation signal go through some of the nastier regions of near-earth space.
GPS are in MEO, not GEO, for various reasons.
Actually, it will appear as PRN (pseudo-random noise) #17 on receiving equipment. That PRN is currently unused. The current vehicle in slot C4 is PRN07, and it will keep that PRN assignment until it is decommissioned by the USAF.
I thought it came from Al Gore.
The computer is my friend!
You can do stuff like that when you're infallible.
Your ideas intrigue me and i wish to subscribe to your newsletter.
You know, I bet the poster to whom you replied had never thought of that. What amazing perception you have!
And the newer satellites most certainly do have SA. SA was turned off (set to zero) back in 2000. At that time, the GPS Block IIR satellites were the most modern, and that is still the case. The capability still exists to reactivate SA if desired.
The next new hardware, GPS Block IIF is scheduled to begin launches in a few years. I do not know whether they also have SA capability, but I would be shocked if they did not.
Funny, Turing is on the list, and (currently) is second in voting only to Linus.
Some think it is both.
I think that one came from the George Lucas expanded edition of the original.
Ah, but Intelsat IA-7 was not as dead as originally thought.
Look everybody, John Hancock is writing his name in the snow...
I think you were correct the first time. Most Americans probably do spell it "privitize".
Easy:
If it is something you want/need, it is easily destroyed.
If it is something embarrassing or incriminating, it will last until the heat death of the universe.
Not sure if that was intentional.
At least you gave us RUSH. And hockey.
Sadly, I have paraphrased both of your examples within the past week. However, your point is a good one. Not only has MP held up over time, but most people who enjoy it don't seem to mind watching again and again...
Likewise our shop (less than 8000 but still big). However, I do know that they are planning to roll out XP in the near future. If they are going to do so, hopefully they will be alert enough to wait until SP2 arrives so that the pain can be inflicted once instead of twice.
Gee, I still had Netscape 4.8 (?) on my machine until last week (along with Mozilla). I finally uninstalled Netscape when I decided I liked Firefox. I never thought I was a die-hard, other than simply [b]not[/b] wanting to use IE.
Why did they have Beck's head in a jar rather than Geddy's?