[time-nuts] iGPS?
Bob Camp
kb8tq at n1k.org
Mon May 18 22:14:22 UTC 2015
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
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