The MEO/GEO distance difference isn't all that great, and comparable
signal strength is seen from the WAAS/EGNOS (SBAS in general) without
too much difficulty in design.
Cheers,
Magnus
On 30/07/13 16:51, bg wrote:
Satnav are not LEO but MEO. Which is good - less sv to cover the earth. Less
good because distance is higher compared to LEO regarding signal power at earth.
--
Björn
Skickat från min Mobil
-------- Originalmeddelande --------
Från: Scott McGrath<scmcgr...@gmail.com>
Datum: 2013-07-30 14:50 (GMT+01:00)
Till: j...@quikus.com,Discussion of precise time and frequency
measurement<time-nuts@febo.com>
Kopia: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Rubrik: Re: [time-nuts] Story in the Economist about GPS jamming
Any competent engineer could have told the powers that be that a satellite
system based in LEO has a relatively high risk profile from the
Universe/hostile activity/spoofing and jamming
Yes GPS is/was oversold.
Trouble is Clarkes law applies here (any sufficiently advanced technology is
indistinguishable from magic). And this applies double to the technological
illiterates in DC
See Sen 'Tubes' Stevens for the canonical example
Sent from my iPhone
On Jul 29, 2013, at 12:46 PM, "J. Forster"<j...@quikus.com> wrote:
It seems to me that GPS has been oversold as the be all, end all system
that made all other systems obsolete and GPS has become all but an
indespensible utility.
Reports like this, could well be used to promote a backup, like LORAN or
eLORAN, just as public buildings have backup generators.
YMMV,
-John
==================
http://www.economist.com/news/international/21582288-satellite-positioning-data-are-vitalbut-signal-surprisingly-easy-disrupt-out?fsrc=scn/tw/te/pe/outofsight
-Bill
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