[time-nuts] iGPS?

[Chris Albertson]

Any wide area and broadband military jammer is taking a big risk
because the jammer is very easy to find.

If Apple is buying into this then it is not military and they are
looking to put it inside a phone or maybe a car.

On Mon, May 18, 2015 at 11:06 AM, 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.



-- 

Chris Albertson
Redondo Beach, California