Not in the UK—http://www.apple.com/uk/iphone/specs.html
IPhone 4S has GLONASS in addition to GPS
71–80 of 95 posts
Re: IPhone 4S has GLONASS in addition to GPS
#72Earlier quoted context omitted.
From which: To improve development of the user segment, on August 11, 2010, Sergei Ivanov announced a plan to introduce a 25% import duty on all GPS-capable devices, including mobile phones, unless they are compatible with GLONASS. I think I can see why the GPS chipsets are starting to adopt this...
That's hardly a motivation for Apple. They still don't have an official dealer in Russia and afaik don't have any plans. Yet, most of government officials widely use iPads (including the president) and every hip kid around the block has an iPhone. This suggests that Sergei Ivanov is merely looking for more ways to tax their own population, not Apple. Russian GLONASS is an archaic POS that they them selves have troubl…
The GPS chips include it (and Galileo) anyway since the frequency is close enough that you don't need any extra HW and with ASICs it's easier to just put everything it and fab a single device.
Whether the ASIC implementation works and whether the iPhone API actually uses it - is another matter
Re: IPhone 4S has GLONASS in addition to GPS
#73Earlier quoted context omitted.
I'm wondering whether it actually matters to people whether their GPS device has 2, 4 or 7m accuracy. Anything with lower resolution than about 5 cm is going to be largely useless for robotic driving, etc, particularly anything worse than 2 m res - so really (and not meaning to be rude to you and your research efforts) - isn't the different resolution irrelevant, and isn't the only reason GPS users should be happy ab…
It means more satellites in the constellation(s), and in circumstances where that makes the difference between getting a GPS/GLONASS fix and having to rely on cell tower/WiFi positioning then the difference in accuracy would be very significant.
Isn't that point confirming what I said, albeit confusing redundancy (availability of other systems as backup when GPS fails) with accuracy?
Re: IPhone 4S has GLONASS in addition to GPS
#74Earlier quoted context omitted.
It's called rtk correction: http://en.wikipedia.org/wiki/Real_Time_Kinematic There's an opensource rtklib which supports a handful of inexpensive receivers: http://gpspp.sakura.ne.jp/rtklib/rtklib.htm
Why don't cell towers do this?
Cell towers kind of do by providing an accurate time and other features in AGPS.
Re: IPhone 4S has GLONASS in addition to GPS
#75Does anyone know if it's possible to see on an iPhone 4S if it is connected to GLONASS satellites (either through an API call or in the settings)?
GPS/GLOSNASS/GALLILEO work by sending time signals, there isn't really a "connection" to a GPS satellite. Then there is the AGPS/Wifi GPS stuff which gives you even more information. All these sources are combined mathematically to estimate spacetime coordinates.
What the iPhone API exposes is the estimated accuracy of all these sources combined.
Re: IPhone 4S has GLONASS in addition to GPS
#76Does anyone know if it's possible to see on an iPhone 4S if it is connected to GLONASS satellites (either through an API call or in the settings)?
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Re: IPhone 4S has GLONASS in addition to GPS
#77Earlier quoted context omitted.
GLONASS+GPS is more accurate than just GPS, so the answer to your question is no. :)
Only if your software is aware and dealing with it correctly, I'm guessing.
There isn't a GPS / Galileo / GLONASS / AGPS api in iPhone, you just get location data.
Apple generally doesn't expose APIs that require working knowledge of general relativity.
Re: IPhone 4S has GLONASS in addition to GPS
#78Earlier quoted context omitted.
It means more satellites in the constellation(s), and in circumstances where that makes the difference between getting a GPS/GLONASS fix and having to rely on cell tower/WiFi positioning then the difference in accuracy would be very significant.
Isn't that point confirming what I said, albeit confusing redundancy (availability of other systems as backup when GPS fails) with accuracy?
I'm not talking about the entire system failing and falling over to the other, I'm talking about the probability that from any given point you can see enough satellites to get a fix. More satellites is better.
Re: IPhone 4S has GLONASS in addition to GPS
#79Earlier quoted context omitted.
I'm wondering whether it actually matters to people whether their GPS device has 2, 4 or 7m accuracy. Anything with lower resolution than about 5 cm is going to be largely useless for robotic driving, etc, particularly anything worse than 2 m res - so really (and not meaning to be rude to you and your research efforts) - isn't the different resolution irrelevant, and isn't the only reason GPS users should be happy ab…
Computer driving is more about vision systems than GPS. Maps certainly aren't accurate into the centimeter range in any event. Sailors find that their charts are some times off by kilometers. I've personally seen a large, erroneous discontinuity in the western coast of St. Lucia while using a GPS chart plotter for navigation. Chart data is copied forward from older charts, many of which were made in the 1800s, those…
If your maps were wrong you could start a war :-) [1]
[1] http://abcnews.go.com/blogs/politics/2010/11/google-nearly-s...
Re: IPhone 4S has GLONASS in addition to GPS
#80Earlier quoted context omitted.
Assisted GPS Digital compass Wi-Fi Cellular I did a CTRL-F on GLONASS and no match is found. I said I did this in my edit... I'd take a screenshot, but I'm at work.
Where do you live? It's probably GPS-only for your region.
No sign of it on the Canadian website. Now you've got me curious if the Canadian version of the phone has it disabled or something, because its presence would really help me with an app I am working on.