I was comparing the gps coordinates reported for the SGS2 and iphone 4 using gps status tools and found that they differ by about 15-17 minutes! 60 minutes is equal to 1 degree. On the map, that is close to about 50 meters which causes google maps to show me riding through the houses on the SGS2 where as the iphone 4 shows that I am on the road/railroad tracks. This is with both phones running side by side. The gps status tools were also reporting an accuracy of 5m and I had 11 satellites locked port of 12 in view.
Anyone else notice this? I am using the KH3 stock rom. Obviously it doesn't happen with navigation maps such as navigon as they snap your location to the nearest road.
Is there a way to calibrate the longitude and latitude readings on the SGS2 so that it closer matches the maps used on google maps?
If youre riding through houses, get a bulldozer. Haha. I have no idea to answer question
I voided my warranty and your mum.
Sleepycat3 said:
I was comparing the gps coordinates reported for the SGS2 and iphone 4 using gps status tools and found that they differ by about 15-17 minutes! 60 minutes is equal to 1 degree. On the map, that is close to about 50 meters which causes google maps to show me riding through the houses on the SGS2 where as the iphone 4 shows that I am on the road/railroad tracks. This is with both phones running side by side. The gps status tools were also reporting an accuracy of 5m and I had 11 satellites locked port of 12 in view.
Anyone else notice this? I am using the KH3 stock rom. Obviously it doesn't happen with navigation maps such as navigon as they snap your location to the nearest road.
Is there a way to calibrate the longitude and latitude readings on the SGS2 so that it closer matches the maps used on google maps?
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could u find out a solution ???
It's just the way uncertainty works i'm afraid. There will always be an error associated with any timing of a GPS signal and this will lead to an uncertainty in the calculated position. Could try reading this, good a place to start as any:
http://en.m.wikipedia.org/wiki/Experimental_uncertainty_analysis
Another thing people often question is why different devices report their GPS accuracy differently. This is usually down to the method used for estimating error more than anything relating to superiority of GPS implementations.
Sent from my GT-I9100 using XDA App
Actually looks like you're getting confused about coords also. One second of arc corresponds to around 30m, one degree is approx 111km.
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MarkSkov said:
It's just the way uncertainty works i'm afraid. There will always be an error associated with any timing of a GPS signal and this will lead to an uncertainty in the calculated position.
Another thing people often question is why different devices report their GPS accuracy differently. This is usually down to the method used for estimating error more than anything relating to superiority of GPS implementations.
Sent from my GT-I9100 using XDA App
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what i was aware of is GPS could give me accuracy by 100x100mtrs, and that was done by purpose for some security reasons.....but my SGS2 GPS is 350 mtrs off, my actual location...so can i in any way calibrate it to correct location??
When I'm driving with navigon software running its spot on where I am on the road.
Would be hopeless if it was 100 metres out.
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Calibrating the GPS
I would also love to know if there's a way I can calibrate my GPS. When i'm sitting in my office, my GPS consistently shows me out in the trees around 50 meters out. Is there a way I can can calibrate my GPS to my current position?
I had this exact problem - the GPS was off the mark, even factoring in the error.
I was on KH3.
I updated ROM and Modem to KI3 and it has fixed that. It locks on VERY quickly now.
I would suggest you try flashing a new rom + modem and seeing if that works.
Related
Got at Best Buy at 7:30. Got my Nexus S. It was so sick. Til the GPS wouldn't get a lock. GenieWidget couldn't get wireless location either. Using T-Mobile. Nexus One locked just fine.
Also the demo phone didn't seem to be having issues so I got an exchange. This one doesn't work either. Who here can get a lock on their GPS?
I can't get a GPS lock either.
Sent from my Nexus S using XDA App
Download/install GPS Status & Toolbox and get the latest aGPS data, go outside, test, report back
Me either buttttt my sisters Mytouch 4G didnt either which is a big surprise...so let me know if it works on its own
Oh and the compass works great.
My GPS isnt locking either.....
I couldn't lock too
Sent from my Nexus S using XDA App
I GOTTT IT!!! GPS lock with 9 meter accuracy!!
I left the app open for a min then I force closed it then restarted the phone and now works like a champ!!!!
Mine locked to 7 sats in 5 seconds on the first try while inside. Walked into the back yard and got 11 sats, accuracy down to 5m.
crachel said:
Download/install GPS Status & Toolbox and get the latest aGPS data, go outside, test, report back
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Still not working.
I am getting one hollow green dot using that app after following instructions.
Sent from my Nexus S using XDA App
maybe the satellites are down where you are, lol
I tested mine.
The globe star should be the icon and is it solid means it's locked in?
If so, I got mine locked in in about 15-20 seconds (Bay Parkway and 69th Street, Brooklyn).
I got a lock immediately even in a GPRS area.
****. . What's with bad luck with phones. I think GPS is defected on mine. I tried it outdoor and it only saw 2 without locking of course
Sent from my Nexus S using XDA App
psp888 said:
maybe the satellites are down where you are, lol
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Click to collapse
Then uh why does GPS work on my Nexus One and my Vibrant?
I tested my Nexus S (T-Mobile) side by side with my Incredible (Verizon) and they both locked fairly quickly onto GPS. Repeated the test in a few different locations yesterday and today, and the Nexus S did well, as did the Inicredible.
Indoors with GPS off (and Wifi off) is a different story. The Incredible will show my approximate location in Google Maps, whereas the Nexus says "Waiting for location" then after a while "Your current location is unavailable". I guess the Nexus S can't use the cell towers to get a fix .
5-6 sats locked in under 15 seconds indoors. 11 locked within 30 seconds, but I haven't tried with no wifi or cell for aGPS assist.
Try getting the app GPS Status & Toolbox from the Market...it will download the GPS almanac and give the phone a better initial starting point for cold starts.
I have both Network Towers and GPS turned on and I always have a tiny blue circle around my position. With my Nexus One, the blue circle disappeared and had I had perfect lock
Even then though, the Nexus S is a bit slow at properly figuring out where I am, especially during Navigation. The GPS functionality is below the Nexus One.
Immediate lock.
Pretty heavy rain here in Los Angeles last night. GPS took a little longer to lock up on my way to dinner, but still locked position within a 60-90 seconds. Funny thing was that it reported accuracy of only 1300m the whole drive, but the position displayed on the map was 100% spot on to my actual location.
The Galaxy S line came out with HORRIBLE GPS, it was unusable and became a fixation for hatred of the device for many. As newer firmwares came out, it improved dramatically and I have no complaints with it on my SGS now. My friend with a T-Mobile Vibrant has stopped using his and gone back to an iPhone 3G because of the lousy GPS on it.
Samsung has supposedly changed the antenna for GPS and WiFi from the one used in older Galaxy S devices; I think it's remarkably improved.
I am not sure why this is but even though the GPS for HTC devices is fast and accurate, the track accuracy for exercise apps like Cardiotrainer is way off, more so than Samsung Vibrant and Samsung Nexus S, which have far inferior GPS.
A five mile run that I know is five miles will show as seven miles, even though in GPS test it's showing accuracy of less than 10 feet. The accuracy of the same track with Samsung device is still off, but by a much smaller margin and that's with GPS test accuracy at around 30 feet.
Has anyone experienced this same issue with HTC devices? I've reproduced this inaccuracy on both MT4G and my old G1.
Secondly, any advice on toggling the Cardiotrainer settings to help make it more accurate?
thanks in advance
Sent from my HTC Glacier using Tapatalk
I tried some app that was way off like you are describing. Then I tried JogTracker which had a few less features than the one I first tried, but has been fairly accurate.
netter123 said:
I tried some app that was way off like you are describing. Then I tried JogTracker which had a few less features than the one I first tried, but has been fairly accurate.
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Thanks for responding. Oddly enough, Cardiotrainer was actually more accurate distance-wise on a device with worse GPS. The reason I'd like to continue using it is because your tracks are synced with your gmail account.
I'm going to toggle the accuracy settings to see if it makes a difference and if it does not, I'll switch to an alternative, and I'll definitely check out the app you suggested and post my findings
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Ok. Well it's not perfect but I was able to get actual distance of a track to be more accurate by changing 'Select Frequency' to 30 seconds instead of 1 second. On a 5.6 mile walk or jog, despite having locked onto 10 birds and having good accuracy in GPSTest, Cardiotrainer was giving final distance of anywhere fro 6.4-7.5 miles with 'Select Frequency' set to 1 second. I switched it to 15 seconds and got more accurate distance. When I set it to 30 seconds, I got 5.9 miles, which is still not perfect, but much better.
I have been testing this with only gps turned on and I've tried it with 'use wireless networks' enabled for data assistance but it doesn't make any difference.
I'm going to try it with a longer frequency than 30 seconds and see if there are any improvements and post it here.
Having same issue on mt4g
I just recently started using cardio trainer and I am seeing the same problem. At first I thought it was not getting a gps lock and instead was using my stride length, but it appears to just be off. I tested it this past Saturday and it gave 4.37 miles for a loop that I know is 4.17 miles. I also watched it very closely as I walked by markers indicating a .75 mile distance and it indicated .8 miles. I guess that sounds more accurate than what you are seeing, but I want it to be much better. My settings were every 1 second and filter level of exact. Please let me know if you found any other way to tune the accuracy.
My GPS status app stills all the time searching for my position, also other apps can't found my position, they can do it only with the A-GPS
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checho_acosta said:
My GPS status app stills all the time searching for my position, also other apps can't found my position, they can do it only with the A-GPS
Sent from my Nexus S using XDA App
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Are you on stock? Can you usually get a gps signal where you are? I had immense issues with gps on my epic but have had none on the nexus unless I'm in my house.
Sent from my CM7 Nexus S!
which GPS are you using?
Frostlord said:
which GPS are you using?
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im assuming the one with the LEO satellites
*smart ass hat off*
there are a few GPS that is available in my region, A-GPS, papago, Garmin, etc etc
shouldnt there be difference among these GPS? or are they all sharing the same satellite?
Nexus S GPS
I am running stock in AK and have only had issues in concrete buildings. Locks on in less than 5 seconds in my house and while driving.
checho_acosta said:
My GPS status app stills all the time searching for my position, also other apps can't found my position, they can do it only with the A-GPS
Sent from my Nexus S using XDA App
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My Nexus S' gps reception and accuracy is noticeably inferior to my Nexus One. The difference is very obvious indoors, my Nexus S will struggle to even detect satellites while my Nexus One can get a fix fairly quickly.
When I'm outside the house, my Nexus S can get a fix, but it gets the fix slower than my Nexus One by probably 10 seconds. Subsequent fixes will be almost instant though. If I don't use the GPS for a while, the first fix will take longer again.
The Nexus S will usually get 10m accuracy, and it sometimes jumps between 10m and 30m accuracy. I rarely get 5m accuracy with it. On the Nexus One, I consistently get between 1 to 3m accuracy.
Frostlord said:
there are a few GPS that is available in my region, A-GPS, papago, Garmin, etc etc
shouldnt there be difference among these GPS? or are they all sharing the same satellite?
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Click to collapse
Yes, they all share the same satellites. I believe the US GPS sats are the only ones currently covering the globe, but Russia has some supplemental satellites that cover their area.
You're confusing brands of devices and technologies and GPS all at the same time.
GPS is the 24 global positioning satellites ran by the US military. They provide the radio signals that all GPS receivers/navigators use.
Garmin, Magellan, etc are brands of devices that intercept and interpret those signals to give you your position.
A-GPS is "assisted" GPS in cell phones, where the phone can use the cellular network tower location information to "assist" the GPS in figuring out where it is if it's having trouble finding the satellites or hasn't locked onto them yet.
The difference in performance, in my opinion, is primarily antenna design and bad software in non-dedicated devices like our smartphones.
sagech said:
The Nexus S will usually get 10m accuracy, and it sometimes jumps between 10m and 30m accuracy. I rarely get 5m accuracy with it. On the Nexus One, I consistently get between 1 to 3m accuracy.
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Totally agree. N1 had awesome GPS. It would lock on very quick and the position indicated onscreen corresponded to your actual position. I was hoping the GPS issues would be sorted out by samsung by now, but I guess not
thanks for all the inpit
what is the average lock time? i never use GPS device before
is it below 10 seconds?
I'm using GPS status app, but also it happened to me with all the LBS apps .... I used to live in Bogotá and it took 10 to 20 seconds to find the signal. But now here I'm in London and it never find the signal so I can't determine my location ....any idea of what's happening or how to fix it?
Thanks
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I've checked around for GPS problems and I wasn't able to find anything in search for this on the Atrix. The problem is after updating to 4.1.83 I can't lock on any Satellites, anyone else have this issue?
Same for me. Takes just a bit longer to catch some sats. Idk. Ill keep testing it tho.
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Atrix GPS vs Aria
I noticed that the GPS doesn't utilize all the available satellites sometimes. I used GPS test on my Aria and compared it with the Atrix.
The Aria picks up the satellites faster, gets a more consistent accuracy and is more accurate than the Atrix.
The Atrix GPS sometimes utilizes 12 satellites and still doesn't have the accuracy the Aria has =[
I noticed that during GPS test the signal usually needs 30+, around 40 to get a real good accuracy, which is something the Aria can do, but the Atrix doesn't.
Note: I ran my test at separate times, minutes within each other and wiped data and forced stop so they start from cold. This way the two devices won't interfere with one anothers performance.
Well, I'm on 4.1.83 and I get a satellite lock in 15 seconds with AGPS and 40 seconds without it. There should be something wrong with your settings. Based on GPS Status data, the accuracy is 2 meters.
In my back garden with a clear sky and a 13 satellite lock, I couldn't get it any more accurate than 20 metres. At work it was all over the place before locking down to 40 metres but about half a mile from my actual location.
Anyone else experiencing issues with GPS location?
Sent from my Nexus 4 using xda app-developers app
I just went out and gave it a try and saw 3- and 4-meter accuracy with GPS Test and GPS Status. I haven't noticed any problems with Maps or Navigation, either.
I've noticed a huge improvement over my sensation in lock speed, number of sats it locks to, lock quality and accuracy.
I've been playing ingress and I'm locking immediately every time.
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