[time-nuts] iGPS?

Brooke Clarke brooke at pacific.net
Mon May 18 14:06:12 EDT 2015


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
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