[time-nuts] iGPS?

[Bob Camp]

Hi Brooke:

In the original post that I was replying to, the concept was advocated as a 
“it goes into every iPhone on the planet”. That’s what I was commenting on.

Bob

> On May 18, 2015, at 2:06 PM, Brooke Clarke <brooke at pacific.net> wrote:
> 
> 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 <albertson.chris at gmail.com> 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
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.