Hi Bob:
In the link in the message from Brian it explains that iGPS is for military
users of the Iridium system.
The key feature is to allow a moving vehicle to lock on the GPS signal while being jammed. They do that and also get a
more accurate fix by using signals from the Iridium satellites.
I see a potential problem in that the Iridium signals are close in frequency to GPS and a broad band jammer might cause
a problem for both of them.
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
Hi
“Orders of magnitude” more accurate …
Right now, you can get around ~1 M in most areas. One order of magnitude would be
<10 cm.
More than one order of magnitude would be <10 mm. To me “orders” implies more
than two, so that
would be <1 mm.
I guess everybody can toss out all their multi band GPS gear, there’s no need
for it anymore. No need
to put up all those expensive block III GPS sat’s either :)
hmmmmm……I do believe the marketing boys have been playing with the numbers. You
would have to start
from a >50 M error to get them to make much sense based on what they are doing.
===========
If you dig a bit more, Apple bought Coherent Navigation almost a half year ago.
The main purpose appears
to be merging their mapping software into Apple’s ill-fated maps program. Given
that Iridium is a “pay’
service (as in $$$$$) you probably will not see it in run of the mill cell
phones very soon ….
Bob
On May 17, 2015, at 7:07 PM, Chris Albertson <[email protected]> wrote:
Anyone know anything about "iGPS"? Apparently the Iridium low orbit
communications sats are now modified via software update to send
signals that when combined with GPS allow for a receiver that is MUCH
more precise and harder to jam and can work in urban areas better.
Apple just bought a company that is building iGPS receivers. Looks
like something that they might want to put inside a cell phone but
when you have an orders of magnitude important in position you'd
expect better timing too, or so I would think.
Seems like a very smart idea if all that was required was a software
upload to existing spacecraft. From what I read this is real, not a
proposal another are real receivers being tested.
--
Chris Albertson
Redondo Beach, California
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