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Posted by Michael on July 9, 2007, 3:21 pm
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Hi,
I was watching Future Weapons on Discovery and they had a missile that was
guided by GPS that could detonate above, below or at ground level.
During the show they commented that there is a more precise GPS system that
is exclusively for military use.....is that true? I thought that there is
only one GPS system that was used by both civilian and military equipment
and there is no mention about a military specific system in the GPS
Wikipedia article.
Sorry if this is the wrong newsgroup, I was going to ask about the
technology inside the missile but worked it out half way through. <g>
Cheers,
Michael
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Posted by Colin Durrans on July 9, 2007, 4:18 pm
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Michael wrote:
> During the show they commented that there is a more precise GPS system that
> is exclusively for military use.....is that true? I thought that there is
> only one GPS system that was used by both civilian and military equipment
> and there is no mention about a military specific system in the GPS
> Wikipedia article.
did you read the part on "Selective Availability"?
Basically an encryption to reduce accuracy that's known to the US
Military and allies...
regards,
Colin
--
www.minisumo.org.uk
(Remove the "No Spam" to reply by email!)
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Posted by Michael on July 9, 2007, 6:01 pm
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> Michael wrote:
>
>> During the show they commented that there is a more precise GPS system
>> that is exclusively for military use.....is that true? I thought that
>> there is only one GPS system that was used by both civilian and military
>> equipment and there is no mention about a military specific system in the
>> GPS Wikipedia article.
>
> did you read the part on "Selective Availability"?
>
> Basically an encryption to reduce accuracy that's known to the US Military
> and allies...
>
> regards,
> Colin
>
> --
>
> www.minisumo.org.uk
>
> (Remove the "No Spam" to reply by email!)
Yes but it claimed that it wasn't currently enabled:
"Per the directive, the induced error of SA was changed to add no error to
the public signals (C/A code). Selective Availability is still a system
capability of GPS, and error could, in theory, be reintroduced at any time.
In practice, in view of the hazards and costs this would induce for US and
foreign shipping, it is unlikely to be reintroduced, and various government
agencies, including the FAA,[14] have stated that it is not intended to be
reintroduced."
Michael
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Posted by Michael on August 14, 2007, 3:45 am
Please log in for more thread options to fight the spread of AIDS. It's a bad quick fix. Police
* chiefs across the country support [me] this 4 to 1. Unfortunately, Congress
* can't act "soft" on crime, and is about to pass a very bad bill on
* juvenile crime."
More bizarre distortions in our social fabric due to Zero Tolerance:
6/10/97 MSNBC: California: a ten-year-old girl who reported a classmate
for having a joint was also suspended by the principal, under the school's
Zero Tolerance for drugs policy. Her offense: handling the joint to see if
the other student was kidding her before reporting the other student. The
principal said "too bad, that's what 'Zero Tolerance' means". The little
girl and her mother are shocked. [I am not making these up!!!!!]
6/18/97 NBC News Channel 4 NYC: A career teacher is forced to resign because
she thought her student was kidding about having a baggie of pot. Students
and parents are stunned. The teacher said she believed her students had better
sense than that, and since she inspected it and it smelled like oregano she
was sure they were kidding her. Students and their parents protest, the school
board asks her back, but she says no, she is too disgusted at her treatment.
Zero Tolerance victims, falling into the abyss.
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Posted by Peter Harrison on July 9, 2007, 7:16 pm
Please log in for more thread options Michael wrote:
> Hi,
>
> I was watching Future Weapons on Discovery and they had a missile that was
> guided by GPS that could detonate above, below or at ground level.
>
> During the show they commented that there is a more precise GPS system that
> is exclusively for military use.....is that true? I thought that there is
> only one GPS system that was used by both civilian and military equipment
> and there is no mention about a military specific system in the GPS
> Wikipedia article.
>
There is differential GPS which, as I understand it, requires a number
of supplementary transmitters in known, fixed locations. By comparing
the information from the satelites with that from the fixed
transmitters, additional corrections are possible that can produce very
high positional accuracy. Check out the relevant section here:
http://www.trimble.com/gps/index.shtml
This is hardly military only however. Even my little handheld can make
use of differential GPS.
Pete Harrison
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> is exclusively for military use.....is that true? I thought that there is
> only one GPS system that was used by both civilian and military equipment
> and there is no mention about a military specific system in the GPS
> Wikipedia article.