Database Develop

GPS Position Question

Ok, bear with me.
When I had my HTC Touch Pro, I remember the gps program I used would sync to a number of different satellites and switch between them based on different times of the day, signal strengths, etc...
I know that I have read many people saying that their position on gps is off by about 50 to 100 yards most of the time, and nothing they do can correct this.
I know that with the current set of ROM's out there, I am wondering if some of using different satellites to connect to, which because of the position of those satellites may be causing this.
Does anyone know how to check which satellites any specific ROM uses when checking its position using the gps? If different ROM's (from different countries possibly) are using different settings, are they settings we can alter or change to correct this or make our locations more specific? I am relatively sure that the phone uses the network tower location as well as wifi signals to better set someones location on a map, but is there a way to better define where a specific phone is located?
(Note: I did a search or 12 and didn't find anything like this in this forum for the Hero, if you have something informative or relative to say, please be nice about it. Thanks for your input!)

i would think that the actual signal handling is done in the gps chip itself, the android os gets the position "told" from the chip once it is calculated, it also gets the signal strength told.
you can check the satellites and signal with free "gps check" from market.

The gps is based on geo-synchronous satellites. The accuracy is based on the algorithm used and the number of available satellites. There are offsets to reduce accuracy which are imposed to limit the military uses. There are sync points to known objects (towers) which allow refinement.
The time lag of the gps receiver radio could, if it were designed wrong , affect the accuracy, but not likely since most likely it stores the time difference to the clock, asynchronously. ( a guess)
You can get more accurate software (wasp) . My marine unit gets me to 10 meters. I can usually find stuff 35' away. lol
So to answer your question, I don't think roms unless they changed the kernel affect the accuracy.

I guess there is a chance that the ROM has set the GPS to look for certain satellites by default, thereby causing some confusion, but I'm not sure that is the issue because my GPSr seems to be pretty accurate unless I am navigating with Google Maps at high speeds. I was thinking maybe it was a speed issue of sorts.
That said, here are some grabs of the satellites I'm seeing using DamageControlv2.05 (and the GPS Test app):
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Well, I agree with most of what you are saying, however, I think part of it is retrieving the signal from the gps chip, and I think part of it is the software on the phone is taking that information and combining it with the location information from triangulation with towers and its throwing off the location a little. Outside, with a clear sky, no buildings blocking me, and on the map (using satellite or map layers, I am still about 100 feet away from the map location. I know others have complained about it. I am just wondering if there is something in the ROM or software that might be causing it.

First, read up on aGPS, and how that works. Most people seem to think that it's a cheap, dumbed down, "pseudo-gps"... That's not true at all. aGPS is complete, fully capable GPS with extras that it can use to enhance both speed and accuracy.
A few of the things aGPS does to speed up the inital lock, though, can mean that the position is less than accurate for the first minute or two, until it acquires a full blown lock from the satellites.
When properly implemented, aGPS should be *better* than just regular GPS. There is room in there, however, for a programmer to screw up when coding an algorithm or two and actually throw things off. I'll admit that I would have thought that this would have all been handled on the GPS chip, but now that I think about it more, it's very possible that some of the logic is done by the software on the phone, and that could change between software versions.
Still, that's not the sort of code that rom devs are changing, so any inaccuracies caused by the software should be consistent between the various roms based on the same Android version....

[Q] GPS doesn't get lock. Software or Hardware issue?

I'm in the UK (London) and have tried several firmwares, none of them gave any acceptable result for the matter that the phone doesn't lock on any single satellite.
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I've sent the phone on a warranty repair (O2) saying that it doesn't lock on any satellite. Just got it back today and here's what they said:
"one of our engineers has found the problem and fixed it. For quality control, another one of our engineers checked the repair."
Guess what, nothing happened it still doesn't work. I hope you can come up with some solution - even if it involves hardware fix.

"one of our engineers has found the problem and fixed it. For quality control, another one of our engineers checked the repair."
Click to expand...
Click to collapse
Ask them what problem was found, was it related to software or hardware?
Its mostly the settings which might need tweaking as per your location. I have noticed that 1st time gps locking takes time & you should have working data connection to assist its locking & after that the phone maintains a cache of your locations.
GPS dont work indoors so go out in open park 50mt away from the nearest buildings & switch on the gps & see if it locks or not. Indoor the phone uses cell tower to determinate your location but gps wont lock your location due to missing signals.
These are my settings.
menu>settings>Location & security>
check all with green check mark.
use wireless network
use gps satellites
use sensor aiding
Might help to lock, try these & report back.

http://forum.xda-developers.com/showthread.php?t=1032034
Worth a try and also worth looking at the GPS fixes posts .
5 mins = 7- 11 sats on a cold boot for me .
jje

Did you tried a diffrent modem? Like JQ1 or something. Maybe that help.

I've tried several firmwares with different modems, all of them gave the above result outdoors, still after 10-15 mins waiting. The settings are the best touted around the web, also tried FasterFix... no luck.
I really suspect a HW failure or something with the antenna. The SNR value starts off at around 30-35 when the device senses the satellites, then slowly goes down to 14-18.

myrddral said:
I'm in the UK (London) and have tried several firmwares, none of them gave any acceptable result for the matter that the phone doesn't lock on any single satellite.
I've sent the phone on a warranty repair (O2) saying that it doesn't lock on any satellite. Just got it back today and here's what they said:
"one of our engineers has found the problem and fixed it. For quality control, another one of our engineers checked the repair."
Guess what, nothing happened it still doesn't work. I hope you can come up with some solution - even if it involves hardware fix.
Click to expand...
Click to collapse
Why do you need GPS fade? Doesn't the great lord of the dark tell you where to go?
Sent from my GT-I9000 using XDA App

Sorry i'm not native english speaker.. what's that you're saying in other words (gps fade)? The great lord of the dark must be from Wheel of time lol
Development in the case:
As Chris_84 suggested, i've tried XXJQ1 modem and i've managed to get a lock on 3-5 satellites for about a second, then dropped. But the SNRs are far better than the one on the screenshots. I'll try some others too.

myrddral said:
Sorry i'm not native english speaker.. what's that you're saying in other words (gps fade)? The great lord of the dark must be from Wheel of time lol
.
Click to expand...
Click to collapse
A "fade " is another name for myddral in the English versions of wheel of time, sorry nothing to do with your question, but as we both have wheel of time user names I couldn't let it pass....
Sent from my GT-I9000 using XDA App

Did you try tweaking the lbs settings? If not go to the link on my signature and try the methods over there

well, regarding that everyone directs to the same settings which i have:
supl.google.com
port 7276
agps mode supl
hot start
standalone
accuracy 50

myrddral said:
I'm in the UK (London) and have tried several firmwares, none of them gave any acceptable result for the matter that the phone doesn't lock on any single satellite.
I've sent the phone on a warranty repair (O2) saying that it doesn't lock on any satellite. Just got it back today and here's what they said:
"one of our engineers has found the problem and fixed it. For quality control, another one of our engineers checked the repair."
Guess what, nothing happened it still doesn't work. I hope you can come up with some solution - even if it involves hardware fix.
Click to expand...
Click to collapse
I had exactly the same problem with GTI9003 fw DDKB2. I tried all the softwares which you tried and results were exactly same. No settings worked. So I changed to XXKB3 available in forum. The GPS worked instantly without having to change any settings. I have tried this on two different pcs and it works. So you can try this fw and let us know the results.

@mrdeepakbajaj
the signal is still low with only 4 satellites & none locked as yet in your screenshot but I have found a fix here with gps tweak
http://forum.xda-developers.com/show....php?t=1043034
Now I can lock within 2 sec with 5 mt accuracy to 11 satellites, here is my post about my testing.
http://forum.xda-developers.com/show...&postcount=142

[Q] Losing GSM and WiFi signal

I was running CM 11 (maclaw's) then for about a month or so I was having incredible slowness on WiFi. After some hours on stand-by, I don't know what happens to my device, the WiFi get super slow. This is what a normal connection looks like:
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and this is how a stricken one looks like: (note the ping value)
Then I jumped ship to CarbonROM (also maclaw's). The WiFi problem didn't go away but now I also have a GSM signal cut off problem!:
Like the WiFi problem, after some hours on stand-by the GSM signal cuts off, persists that way until I boot my device.
What could be causing my connection problems? Do you think it's the ROMs? I really need help. I can deal with the super slow WiFi issue but GSM cut off is really serious. (I was apparently called for an interview but couldn't receive the call!)

wtx1033 said:
I was running CM 11 (maclaw's) then for about a month or so I was having incredible slowness on WiFi. After some hours on stand-by, I don't know what happens to my device, the WiFi get super slow. This is what a normal connection looks like:
and this is how a stricken one looks like: (note the ping value)
Then I jumped ship to CarbonROM (also maclaw's). The WiFi problem didn't go away but now I also have a GSM signal cut off problem!:
Like the WiFi problem, after some hours on stand-by the GSM signal cuts off, persists that way until I boot my device.
What could be causing my connection problems? Do you think it's the ROMs? I really need help. I can deal with the super slow WiFi issue but GSM cut off is really serious. (I was apparently called for an interview but couldn't receive the call!)
Click to expand...
Click to collapse
Install some other rom (not novafusion's) to see if the problem persists (don't forget to make a Nandroid backup first and to change the f2fs to ext4) and update your baseband(from here: http://forum.xda-developers.com/showthread.php?t=2526831).
I use Android-Andi's SlimKat with none of your problems.

i am using f2fs. do you think the file system has something to do with it?!

wtx1033 said:
i am using f2fs. do you think the file system has something to do with it?!
Click to expand...
Click to collapse
I don't think so. I have none of your issues (with CM11, f2fs, system, data & cache). Anyway, you can always try & report your results

mauam said:
I don't think so. I have none of your issues (with CM11, f2fs, system, data & cache). Anyway, you can always try & report your results
Click to expand...
Click to collapse
like this?
this also doesn't work the dialogue comes up, but been waiting for 15 minutes and nothing happened. maybe sends in the background?!

wtx1033 said:
like this?
this also doesn't work the dialogue comes up, but been waiting for 15 minutes and nothing happened. maybe sends in the background?!
Click to expand...
Click to collapse
Everything work just fine for me. Do a clean flash, if doesn't work forget it or try with other rom

i did a clean install (while installing the latest carbonrom). same thing. bug report still doesn't work. never mind that. i still have problems with the wifi speed dropping significantly after some hours on standby. at least the GSM signal issue seems to be gone―which was the worst bug of all!

jstath1972 said:
Install some other rom (not novafusion's) to see if the problem persists (don't forget to make a Nandroid backup first and to change the f2fs to ext4) and update your baseband(from here: http://forum.xda-developers.com/showthread.php?t=2526831).
I use Android-Andi's SlimKat with none of your problems.
Click to expand...
Click to collapse
does the baseband actually effect WiFI? I thought it was for GSM comm.

wtx1033 said:
does the baseband actually effect WiFI? I thought it was for GSM comm.
Click to expand...
Click to collapse
Baseband doesn't effect WiFi (it only effect GSM and radio) but the kernel effect WiFi

As xXPR0T0TYPEXx says baseband doesn't affect WiFi but only the GSM and radio (problem to CarbonROM).

jstath1972 said:
As xXPR0T0TYPEXx says baseband doesn't affect WiFi but only the GSM and radio (problem to CarbonROM).
Click to expand...
Click to collapse
the GSM problem seems to be gone after I clean installed carbon 20141012 release. but the goddamn wifi issue persists.

wtx1033 said:
the GSM problem seems to be gone after I clean installed carbon 20141012 release. but the goddamn wifi issue persists.
Click to expand...
Click to collapse
Install some other rom (not novafusion's) to see if the problem persists like i said before.

jstath1972 said:
Install some other rom (not novafusion's) to see if the problem persists like i said before.
Click to expand...
Click to collapse
unfortunately it does. i tried slimkat. the wifi problem persists.
then i installed maclaw's AOSPA. surprise, surprise(!) the problem is still there.
it's really annoying because when the problem starts, the wifi indicator happily indicates that it is getting full signal. but i am not getting any notifications or i am getting them with a massive delay, because my bandwidth has dropped below 1 mbps with humongous ping value.
i also didn't tinker with my router for a year. it runs the same firmware and same settings.

according here, -i guess- it seems to be a bug with android 4.4.4 :crying:

okay, i tried keeping gps on to see if there was any change...and there indeed was! this time the wifi speed didn't drop (but there was a cut off!):
so i am guessing it's a nasty bug that involves gps: in the absence of gps, wifi speed somehow decides to drop to creeping levels.
then i either have to keep gps on and sacrifice battery life or keep it off and manually on/off wifi every couple of hours :S

Mate S: GPS Issues?

GPS issues?
My phone's GPS keeps dropping for some reason. Places I had no problem with on my Nexus 5 suddenly become dead zones with the Mate S. Anyone else have similar issues? My phone was originally from China and I'm in the US if that makes a difference.

I have not had any issues, actually it is probably one of the best functioning GPS's I have had in a phone. It generally works fast and well I have just returned for a week's vacation where I used it everyday for walking around - no problems what so ever., and fast reception even using the phone with no data connection.

commanderfun said:
My phone's GPS keeps dropping for some reason. Places I had no problem with on my Nexus 5 suddenly become dead zones with the Mate S. Anyone else have similar issues? My phone was originally from China and I'm in the US if that makes a difference.
Click to expand...
Click to collapse
That does make a diff. Most China devices are hard coded to only connect to china based Sats and due to this they have trouble connecting to any sats that are not based out of china. Just one of the things you give up when buying china devices.

For me also the Mate S has the best GPS I ever had. Locks so fast and inside the building where I never had before GPS.

gps problem
After firmware update I do reset and a-gps stop working. The sattelites find slowly and works very bad

I use my Mate S from early December 2015.
On December 15th I upgraded the firmware to version B145.
I had no problems with the GPS until ... last week. Then (in Endomondo v 12.0.1), GPS signal dropouts began occur frequently.

I too have started to get blank spots with the sat nave complaining of no signal. Checking gps test shows plenty of sats. I have reset the agps and let it learn its own to see if its any better. Thus was spot on, not sure what has changed as the firmware is still the same at C433B114.

Yesterday, I upgraded my Mate S to Marshmallow (Beta - B303). The problem with the GPS still occurs but ... only the first few dozen minutes.
Then - for the next two and a half hour - everything returns to normal and GPS in Endomondo works fine.
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I think, I found a solution to this problem.
When I switched battery mode to Normal (previously I used Smart mode), the GPS works normally all the time.

chato.pl said:
I think, I found a solution to this problem.
When I switched battery mode to Normal (previously I used Smart mode), the GPS works normally all the time.
Click to expand...
Click to collapse
Hi!
Please contact to me on mail [email protected]. I have a question about gps. Thank you!.

Has anyone solved this issue? Would rooting my phone help? I'm in Canada and my GPS was working until last week and I didn't even do an update.

Same issue apparently with no reason or update at all....I think it s definitively a gps hardware issue, maybe due to overheating after hot times spent on the car cocpit....any news on thos topic???

Hi Guys, I has the same issue as I was not able to fix anything for 20mn. But then, searching on the net, I found GPS Test app that was fixing thing for Mate 8. So I installed it, I cleared my AGPS with it and then it updated everything and I could fix within 10s. So great. And sometime, even when I'm in a house.

Link please!

Found the apk but still hanging randomly...i ll try a factory reset...any othe hint?

I'm having The same problem. Today I'm going to try:
Power Mode: Normal
Prorect my exercise app: SportsTracker
Prorect GoogleMaps
Enable High Precision Location (GPS, mobile data and Wi-Fi, all activated, of course).
I'm sure the problem is a confluence of factors: Locked Screen, Power Saving Mode (Intelligent?) and unprotected apps, including GoogleMaps
Enviado desde mi HUAWEI CRR-L09 mediante Tapatalk

tutucavoraz said:
I'm having The same problem. Today I'm going to try:
Power Mode: Normal
Prorect my exercise app: SportsTracker
Prorect GoogleMaps
Enable High Precision Location (GPS, mobile data and Wi-Fi, all activated, of course).
I'm sure the problem is a confluence of factors: Locked Screen, Power Saving Mode (Intelligent?) and unprotected apps, including GoogleMaps
Enviado desde mi HUAWEI CRR-L09 mediante Tapatalk
Click to expand...
Click to collapse
No... It's sucks... GPS drops and does not fix my position correctly... :'(
Enviado desde mi HUAWEI CRR-L09 mediante Tapatalk

Tere is the official android 6 update....hope it improves....we'll see...

I have the same problems, also on Android 6. Any updates from anyone?

der_yeti said:
I have the same problems, also on Android 6. Any updates from anyone?
Click to expand...
Click to collapse
Same problems here with GPS. Hope Huawei to fix these issues with an update. It has been a long time since the last update.
Sent from my Huawei Mate S using Tapatalk

No WiFi and Bluetooth signal after camera replacement

Hi guys, I replaced my rear camera and the loudspeaker on my OnePlus 3T an they works well.
The problem is that now WiFi, Bluetooth and GPS don't work (no networks are detected).
I noticed that if I'm really close (1meter) the access point network is detected and I'm also able to connect but with very poor signal strength. The same with bluetooth (10cm). Also GPS does not acquire position.
I think the problem is related to the antenna. I opened my OP3T different times to check if something is wrong but I couldn't be able to figure out what is the problem.
Did someone face this problem?
Thanks in advance.

Hi guys, I tested GPS and it works. So the problem is related to WiFi and Bluetooth. Does someone know what are the pins in the mainboard that connect WiFi circuits to antenna? Without back cover with integrated antenna, should the WiFi normally find some networks? Thanks.

If you can post a Picture of the board, maybe someone can help...

egcv said:
If you can post a Picture of the board, maybe someone can help...
Click to expand...
Click to collapse
Hi, I noticed that in the area indicated by the arrow there's something strange.
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I think it could be a missing resistor.
This one is a mainboard image taken from the web:
If you look at the image it seems that in that position there's a small black resistor.
What do you think? Is that area the one related to wifi circuit (and antenna)? Thanks.

Hi,
I am facing the exact same problem with my OP3 (no WIFI, no bluetooth, GPS working fine) after changing the battery. I precisely compared my phone with the picture you took on internet and I do have exactly the same configuration (I have the small black resistor).
I don't think the issue comes from it.
Does anyone have an idea about what's going on ?
Thanks

Hi !
Did some researches on the subject and found useful info :
- The BT/WIFI chipset is located on the top right of the phone, but under the metallic protection.
- The BT/WIFI antenna is located on top left of the back cover. I guess the connection between the antenna and this chipset is broken somewhere
I'm sorry I didn't provide any image, the forum doesn't let me post images since I am new here

It would be interesting to understand if without back cover normally wifi works (obviously without a strength signal).
Because this way we could figure out if the problem is related to the antenna placed on the back cover (or to the pins that connect it to motherboard) or is related to the motherboard itself.
Thanks guys.

I have this same problem, I tried to pick up pins on motherboard, but it doesn't change anything. Probably something is wrong with back cover.

Has someone found a solution for the issue? I noticed even my phone's hotspot has a weak signal similar to wifi and bluetooth. I'm using my OP3 without wifi or bluetooth for almost 4months now.. Any help is appreciated

Im having the exact same issue after replacing a motherboard, did anyone find the cause?

Hi,
I am having issues with my WIFI and BT signal too. My WIFI signal is ok up to 1 meter and my BT signal up to 30 cm.
Today, after opening my OP3 i've notice something in the back cover. Apparently something was broken. I closely looked at it and noticed it was whiteish some kind of resistor on the top right corner of the motherboard. It was broken and missing from its place.
With me this is probably the thing that is causing the problem.
Just for curiosity purpose, I've opened my OP3 once again and removed the antenna cable. It turned out with or without it it does not make any difference for the signal strength.

Hi,
Do we have any resolution on this issue?