iPhone app
Hi all,
Having recently acquired a new iPhone with a built in GPS, I was wondering
if anyone is aware of an application that uses the GPS 1PPS to produce
accurate time. I seem to remember reading somewhere that it is not possible
to adjust the internal clock, but one could still produce an accurate time
display based on the GPS 1 PPS and even provide time pips. Combine that with
the internal video there seems a myriad of possibilities.
However, trying to find such applications is a large effort and I was hoping
the time-nuts community may be aware of some time-aware cleverness on the
iPhone.
Regards,
Jim Palfreyman
I don't believe that there is a 1pps available to the OS.
The GPS chipset seems to provide a very limited amount of data to the
phone. For example, there does not appear to be any way to get
satellite status info from the GPS chip to the OS. At least none of
the apps I've tried thus far (and I've tried a fair number) provide
anything like that.
Tom Frank
On Feb 17, 2010, at 12:23 AM, Jim Palfreyman wrote:
Hi all,
Having recently acquired a new iPhone with a built in GPS, I was
wondering
if anyone is aware of an application that uses the GPS 1PPS to produce
accurate time. I seem to remember reading somewhere that it is not
possible
to adjust the internal clock, but one could still produce an
accurate time
display based on the GPS 1 PPS and even provide time pips. Combine
that with
the internal video there seems a myriad of possibilities.
However, trying to find such applications is a large effort and I
was hoping
the time-nuts community may be aware of some time-aware cleverness
on the
iPhone.
Regards,
Jim Palfreyman
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/
time-nuts
and follow the instructions there.
Hi,
On 17 Feb 2010, at 07:37, Thomas A. Frank wrote:
I don't believe that there is a 1pps available to the OS.
The GPS chipset seems to provide a very limited amount of data to
the phone. For example, there does not appear to be any way to get
satellite status info from the GPS chip to the OS. At least none
of the apps I've tried thus far (and I've tried a fair number)
provide anything like that.
The iPhone OS provides an 'Location Manager' that will (try to)
provide a location based on available hardware and environment:
The hardware might not have a GPS (Early iPhone, iPod touch) or you
might be indoors.
The system will try to get a location using WiFi access points
(Skyhook Wireless) and/or Cell tower triangulation and GPS
if available and determines heading based on either a compass or
position differences.
I would assume that the GPS hardware provides the satellite
information, but to abstract the used method,
the Location Manager does not provide the satellite info. For the
average consumer it is not really interesting,
they just want to know where they are...
However: I am disappointed that my iPhone, although:
- Having a GPS
- Having a data connection usable for (S)NTP
- Is a participant in the cell phone network
- Sometimes connected via USB to iTunes for syncing content and
performing a backup
is still not displaying the correct time. (Not even having a 'Set
Now' button...)
Using the location even the time zone can be set, although the user
might want to override that one to stay in sync with home.
But for (modern) cell phones to not have a notion of the correct time
is disappointing...
All my previous cell phones had the same problem: Present in the GSM
network, but you still have to set the time.
As I synchronize my calendar with the desktop, they will both give an
alert for an appointment,
but they have a delta of many seconds...
Hoping this will be fixed in iPhone OS 4.0...
Grrr,
Pieter.
Tom Frank
On Feb 17, 2010, at 12:23 AM, Jim Palfreyman wrote:
Hi all,
Having recently acquired a new iPhone with a built in GPS, I was
wondering
if anyone is aware of an application that uses the GPS 1PPS to
produce
accurate time. I seem to remember reading somewhere that it is not
possible
to adjust the internal clock, but one could still produce an
accurate time
display based on the GPS 1 PPS and even provide time pips. Combine
that with
the internal video there seems a myriad of possibilities.
However, trying to find such applications is a large effort and I
was hoping
the time-nuts community may be aware of some time-aware
cleverness on the
iPhone.
Regards,
Jim Palfreyman
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/
listinfo/time-nuts
and follow the instructions there.
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My Blackberry gives me several options for time, including the option to sync from the network on cue, but it will only display the current time with a resolution of 1 minute. There may be 3rd party apps that do better, I have not looked, but I am a little miffed that the phone does not have a standard option to display the time with 1 second resolution on the main display.
This is time-nuts for Heaven's sake!!!
Didier
------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: Pieter ten Pierick time-nuts-mail@tenpierick.com
Date: Wed, 17 Feb 2010 12:32:24
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] iPhone app
Hi,
On 17 Feb 2010, at 07:37, Thomas A. Frank wrote:
I don't believe that there is a 1pps available to the OS.
The GPS chipset seems to provide a very limited amount of data to
the phone. For example, there does not appear to be any way to get
satellite status info from the GPS chip to the OS. At least none
of the apps I've tried thus far (and I've tried a fair number)
provide anything like that.
The iPhone OS provides an 'Location Manager' that will (try to)
provide a location based on available hardware and environment:
The hardware might not have a GPS (Early iPhone, iPod touch) or you
might be indoors.
The system will try to get a location using WiFi access points
(Skyhook Wireless) and/or Cell tower triangulation and GPS
if available and determines heading based on either a compass or
position differences.
I would assume that the GPS hardware provides the satellite
information, but to abstract the used method,
the Location Manager does not provide the satellite info. For the
average consumer it is not really interesting,
they just want to know where they are...
However: I am disappointed that my iPhone, although:
- Having a GPS
- Having a data connection usable for (S)NTP
- Is a participant in the cell phone network
- Sometimes connected via USB to iTunes for syncing content and
performing a backup
is still not displaying the correct time. (Not even having a 'Set
Now' button...)
Using the location even the time zone can be set, although the user
might want to override that one to stay in sync with home.
But for (modern) cell phones to not have a notion of the correct time
is disappointing...
All my previous cell phones had the same problem: Present in the GSM
network, but you still have to set the time.
As I synchronize my calendar with the desktop, they will both give an
alert for an appointment,
but they have a delta of many seconds...
Hoping this will be fixed in iPhone OS 4.0...
Grrr,
Pieter.
Tom Frank
On Feb 17, 2010, at 12:23 AM, Jim Palfreyman wrote:
Hi all,
Having recently acquired a new iPhone with a built in GPS, I was
wondering
if anyone is aware of an application that uses the GPS 1PPS to
produce
accurate time. I seem to remember reading somewhere that it is not
possible
to adjust the internal clock, but one could still produce an
accurate time
display based on the GPS 1 PPS and even provide time pips. Combine
that with
the internal video there seems a myriad of possibilities.
However, trying to find such applications is a large effort and I
was hoping
the time-nuts community may be aware of some time-aware
cleverness on the
iPhone.
Regards,
Jim Palfreyman
time-nuts mailing list -- time-nuts@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@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/
time-nuts
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On 2/16/10 10:37 PM, "Thomas A. Frank" ka2cdk@cox.net wrote:
I don't believe that there is a 1pps available to the OS.
The GPS chipset seems to provide a very limited amount of data to the
phone. For example, there does not appear to be any way to get
satellite status info from the GPS chip to the OS. At least none of
the apps I've tried thus far (and I've tried a fair number) provide
anything like that.
Tom Frank
I would guess that the GPS is an "assisted" GPS and a lot of the "smarts" is
in the cellular system (e.g. Satellite almanac, etc.). All the thing in the
phone does is start with a presupplied estimate of position and get code
phase for some subset of satellites, then do the nav calculation, most
likely with help from the cellsite.
On 2/17/10 6:45 AM, "Lux, Jim (337C)" james.p.lux@jpl.nasa.gov wrote:
On 2/16/10 10:37 PM, "Thomas A. Frank" ka2cdk@cox.net wrote:
I don't believe that there is a 1pps available to the OS.
The GPS chipset seems to provide a very limited amount of data to the
phone. For example, there does not appear to be any way to get
satellite status info from the GPS chip to the OS. At least none of
the apps I've tried thus far (and I've tried a fair number) provide
anything like that.
Tom Frank
I would guess that the GPS is an "assisted" GPS and a lot of the "smarts" is
in the cellular system (e.g. Satellite almanac, etc.). All the thing in the
phone does is start with a presupplied estimate of position and get code
phase for some subset of satellites, then do the nav calculation, most
likely with help from the cellsite.
" Most important to us GPS fanatics is of course the 3G iPhone¹s built-in
GPS. As you can see from the picture, the new location-aware capabilities
come from Infineon¹s PMB 2525 Hammerhead II chip. Accurate to within just a
few meters, the Hammerhead II ³integrates an assisted-GPS (A-GPS) baseband
processor with a low-noise GPS RF front end and multi-path mitigation to
avoid large errors in urban environments². Some have said that the chip¹s
die markings indicate that it¹s actually a Hammerhead I chip, but one
analyst involved in the teardown
<http://www.eetimes.com/news/latest/showArticle.jhtml;jsessionid=ZCHQFCWAAIH
R2QSNDLSCKHA?articleID=209000014> says that it¹s common practice for a
company to take an old chip and make routing and/or connection modifications
and then label the modded chip ³new².
http://gpsobsessed.com/3g-iphone-teardown-infineon-gets-built-in-gps-contrac
t-not-broadcom/
Rummaging on infineon's website for the Hammerhead.. It's a tiny RF front
end and correlator with a serial connection to the host processor. It takes
a 32kHz backup osc and a reference osc from 10-40 MHz. I doubt that there's
an output for any sort of code epoch or nav message.
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