[42943] in North American Network Operators' Group
Re: GPS SA and Network Timing
daemon@ATHENA.MIT.EDU (Owen DeLong)
Wed Sep 26 12:45:51 2001
Message-ID: <3BB205DD.10801@delong.sj.ca.us>
Date: Wed, 26 Sep 2001 09:44:13 -0700
From: Owen DeLong <owen@delong.sj.ca.us>
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To: "Robert E. Seastrom" <rs@seastrom.com>
Cc: "Hire, Ejay" <Ejay.Hire@Broadslate.net>, nanog@merit.edu
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Robert E. Seastrom wrote:
> "Hire, Ejay" <Ejay.Hire@Broadslate.net> writes:
>=20
>=20
>>In our next episode of Militant dictator How-to, we'll show you how to
>>upgrade an antique scud missile to with a guidance system capable of 3-=
meter
>>accuracy for less than $500.00 per unit.. Stay tuned!
>>
>=20
> Somehow, I find it difficult to believe I'm dignifying this with a
> response (much less a public one), but here goes:=20
>=20
> Every commercial GPS unit that I have ever seen has a speed which, if
> exceeded, will cause the unit to shut down (usually until
> power-cycled). It varies from unit to unit, but in every observed
> case was substantially (several times) less than the speed of such
> weaponry in flight. Commercial units also have altitude limits, with
> the same consequences for exceeding them. Integrating an OEM GPS
> module with existing avionics systems' targeting mechanism so it can
> actually cause the missile to adjust its course is left as an exercise
> to the local defense systems integrator.
>=20
I know my Garmin 195 functions in real life up to about 462 knotts. I
don't know what it's shutdown point for real life is, as I haven't ever
been able to deploy it in an environment going faster than that.
I also know that in simulator mode, it is good to about 1000 knotts.
If I remember correctly, the SCUD is subsonic. As such, I believe the
Garmin would handle it.
> Resist the cycle of content-free posts to NANOG...
>=20
> ---Rob
>=20
>=20
Owen
--=20
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