Database Develop

What is the Galaxy S BT/GPS/FM chip?

Has anyone pulled the phone apart and read the serial number off the chip. We are trying to compair it to the US phone. If you have the info thanks Ours is a Broadcomm BCM4751 (Captivate)

Can I ask how you know the Captivate has a BCM4751 chip? Did you disassemble and see it? It appears that the Galaxy S generic being sold everywhere else outside the US has the BCM2075 chip that integrates BT and FM radios; at least that's what's being reported by others here.
If it were true that the Captivate/Fascinate/Vibrant in the US are using the BCM4751 chip, then it would truly mean these phones have no FM capability at all and there is no prospect of rooting the phone to disable a software level crippling.
This pisses me off. I was willing to forgo the front facing camera of the US versions, but the fact that they (apparently) went so far as to have samsung supply a different GPS chip to eliminate the FM radio so you are FORCED to use some ****e, data intensive service like AT&T radio instead is just outrageous. With the GPS/compass/antenna problems seemingly going ignored by samsung, maybe I won't get this phone at all.
http://www.broadcom.com/products/GPS/GPS-Silicon-Solutions/BCM2075

bugmenever said:
Can I ask how you know the Captivate has a BCM4751 chip? Did you disassemble and see it? It appears that the Galaxy S generic being sold everywhere else outside the US has the BCM2075 chip that integrates BT and FM radios; at least that's what's being reported by others here.
If it were true that the Captivate/Fascinate/Vibrant in the US are using the BCM4751 chip, then it would truly mean these phones have no FM capability at all and there is no prospect of rooting the phone to disable a software level crippling.
This pisses me off. I was willing to forgo the front facing camera of the US versions, but the fact that they (apparently) went so far as to have samsung supply a different GPS chip to eliminate the FM radio so you are FORCED to use some ****e, data intensive service like AT&T radio instead is just outrageous. With the GPS/compass/antenna problems seemingly going ignored by samsung, maybe I won't get this phone at all.
http://www.broadcom.com/products/GPS/GPS-Silicon-Solutions/BCM2075
Click to expand...
Click to collapse
Well the Galaxy S might have the BCM20751 but untill someone tears down the phone and checks with their eyes. The US Captivate was torn down and it is a 4751. But the 4751 doesn't have BT on it. So it could be all the phones have a 4751 with a seprate BT and FM. The 4751 is supposed to be a better GPS unit then the BCM20751 though.

ah, I see it on the Captivate general forum now. The only teardown of the generic Galaxy S that I have seen anywhere is the original one done in Korea a month ago. The pictures from that disassembly are too low-res for me to make out chip IDs. I tried going through their video of the teardown frame by frame too, but again, I can't see the numbers clearly and I saw nothing that resembled a broadcom chip. The Captivate board layout is much different than the Galaxy S, I can't really even see where the broadcom chip should be on it either.....

You're gonna love this. On my Galaxy S, According to jupiter.xml:
<gll
LogPriMask="LOG_DEBUG"
LogFacMask="LOG_GLLAPI | LOG_NMEA"
FrqPlan="FRQ_PLAN_26MHZ_2PPM_26MHZ_300PPB"
RfType="GL_RF_4751_DANUBE"
BrcmRFwildBase="0x1E2D6409"
BrcmRFclkDiv="21"
BrcmRFclkRefHz="26000000"
pps-enable="false" pps-offset-ms="0" pps-width-ns="100"
/>
Click to expand...
Click to collapse
I changed the RfType to GL_RF_2075_BRCM and it just didn't work.

Well thats good. We've accomplished something. But Broadcomm says this is the best GPS they have ever made some hopfully samsung messed up the code and we get a super good GPS.

TBH - I think we may actually be waiting on the driver from Broadcom. Something about Broadcoms reputation as an open source provider is in question.

sjdean said:
TBH - I think we may actually be waiting on the driver from Broadcom. Something about Broadcoms reputation as an open source provider is in question.
Click to expand...
Click to collapse
Yeah it could deff. be broardcoms side. They better fix it.

Is the 4751 used in any other phones just want to see the performance of the gps on this chipset in other devices..

The mere fact that we have Broadcom chip for GPS and not some off brand that I've never heard before like InCrystal really, really points to a serious issue with the drivers/firmware for the GPS. The phone should be operating in MS-Based mode out of the box anyway and I don't know why it isn't. That's not the only problem it has but standalone mode is not what it should be operating in. Nearly all phones GPS' are truly the pits without network assistance.
Lots of phones use Broadcom for GPS, right off of the top of my head, the iPhone is one of them!

Well I really hope it can operate in stand alone mode reasonably well, it should be able to, I dont see why a phone couldn't. agps is mainly just for helping get locks faster at startup and possibly in areas where gps signals are weak but agps is not going to help you out of the city much etc etc.
However yeah I really hope it is a driver issue and if so broadcom and samsung need to get together or its going to drag both their names down.

Kilack said:
Well I really hope it can operate in stand alone mode reasonably well, it should be able to, I dont see why a phone couldn't. agps is mainly just for helping get locks faster at startup and possibly in areas where gps signals are weak but agps is not going to help you out of the city much etc etc.
However yeah I really hope it is a driver issue and if so broadcom and samsung need to get together or its going to drag both their names down.
Click to expand...
Click to collapse
Well like I said there appears to be some other issues besides the fact that they ship in standalone mode which is awful for any phone.. aGPS is the first choice for most phones (Galaxy S is an exception I suppose!) before falling back to standalone mode which does take 2-3 minutes for a fix. Standalone GPS will always take a few minutes to get a lock, a phone certainly isn't going to perform better than a Garmin and I have yet to see one of those in standalone mode lock faster than a phone with aGPS. aGPS is for an initial fix regardless of other circumstances and it's why phones get such snappy fixes.

Ok, but I posted elsewhere that there's a whole stack of a lot happening behind the scenes, which Im not even Samsung know what's going on.
First, even in Standalone mode, you see data being streamed in the initial few seconds, so there must be something in there.
But Ok, we have:
Operation Mode under LBSTestMode - MS Based, MS Assisted, Network Provider or standalone
GPS Plus - Uses the OneXtra servers
Skyhook - Another form of AGPS
SUPL Settings
And irrespective of what you set the SUPL settings to:
Jupiter.xml - Points to both www.spirent-lcs.com as an acSuplServer then points to bcmls2.glpals.com as the LbsServer.
Then under Location and Security, we have the ability to Use Wireless Networks (using WiFi and Cellular Networks). Even if this is switched off, the phone still wants to enable Wireless and see what's out there.
So that's what, 6, perhaps 7 or even 8 seemingly different settings, different methods, of A-GPS.
No wonder the phone is getting confused.
Cya
Simon

sjdean said:
Ok, but I posted elsewhere that there's a whole stack of a lot happening behind the scenes, which Im not even Samsung know what's going on.
First, even in Standalone mode, you see data being streamed in the initial few seconds, so there must be something in there.
But Ok, we have:
Operation Mode under LBSTestMode - MS Based, MS Assisted, Network Provider or standalone
GPS Plus - Uses the OneXtra servers
Skyhook - Another form of AGPS
SUPL Settings
And irrespective of what you set the SUPL settings to:
Jupiter.xml - Points to both www.spirent-lcs.com as an acSuplServer then points to bcmls2.glpals.com as the LbsServer.
Then under Location and Security, we have the ability to Use Wireless Networks (using WiFi and Cellular Networks). Even if this is switched off, the phone still wants to enable Wireless and see what's out there.
So that's what, 6, perhaps 7 or even 8 seemingly different settings, different methods, of A-GPS.
No wonder the phone is getting confused.
Cya
Simon
Click to expand...
Click to collapse
Interesting, so standalone isn't really standalone at all
I wonder if any of the problems are actually being caused by agps especially as a lot of the "fixes" by users were basically changes to the agps.
Curious....., if you google skyhook and you see how samsung and I think even apple used skyhook etc and all the big fanfare etc over it but it seems to be disabled in this phone.
and some of the fixes were to use the google location server right?
(weren't google roasted around the world for wardriving and recording wifi sites and also the data? hehe), now i know why they did it.. for location services I guess... a bit off topic but just now seeing why there were even interested in wifi sites etc.
So.. this broadcom chip... its supposed to be good? can we eliminate the hardware as being a bad gps chipset?

Other things to keep in mind when determining the chip are BT and wifi. The 2075, for example, provides bt 2.1, which rules out its presence on the SGS, unless samsung decided to install multiple bluetooth chips. So, the chip we are looking for provides either bt, version 3.0 and wifi N and GPS, or one or 2 of those 3, which makes the 4751 way more likely indeed. I also don't see a reason to change the internals of the phone.

Gps is a Qualcomm RTR6285 like desire, nexus, some blackberry.
careace.net/2010/06/09/disassembly-of-the-samsung-galaxy-s/
news.danawa.com/News_List_View.php?nModeC=4&nSeq=1742568

sesamee said:
Gps is a Qualcomm RTR6285 like desire, nexus, some blackberry.
careace.net/2010/06/09/disassembly-of-the-samsung-galaxy-s/
news.danawa.com/News_List_View.php?nModeC=4&nSeq=1742568
Click to expand...
Click to collapse
This:
news.danawa.com/News_List_View.php?nModeC=4&nSeq=1742568
must be the korean version (hardware is diferent)
for example :
http://www.careace.net/wp-content/uploads/2010/06/galaxy-s-disassembly-29.jpg
http://www.danawa.com/cms/popup_image.php?url=http://img.danawa.com/cms/img/2010/07/06/14.jpg
Audio codec is the same (wolfson)
Configuration files show tha GPS chip is bcm4751 in european galaxy s (not GPS BT FM BCM20751 or BCM2075) in captive there are photos also.

it REALLY seems like a driver issue. I can get a lock within seconds in MS based mode like all other Android phones with 6 meter accuracy tracking in my car but the performance diminishes after that and the phone requires a reboot for another fix -- IF GPS doesnt cause a lock up trying to get a lock.
Anyone else notice the same behavior in MS based mode?
Sent from my SGH-T959

as i have said in the gps issue thread my settings are as they were from the factory, and at least for now my gps works, in test mode it sees 9-11 satalites, and locks 5-7 of then in about 9 secs, it even suprised me today when i was stood on my staires surrounded by brick walls it managed to get a fix.
this was however not the case with the first one i had, no matter what i tried i could not get a reasonable fix, so it seems to me like some phones are better then others, even thought they are the same phones, this is why i suggested it could be a faulty batch but that is not the case, so i have no idea why this one works and the other never.
if you want the settings: gps is set to oo
application setting
session type: tracking
test mode: s/w test
opperation mode: standalone
start mode: hot start
gps plus: on
dynamic accuracy: on
accuracy: 50
skyhook: off
use pc tool: off
supl/cp setting
sever fqdn: custom
server: www.sprint-lcs.com
server port: 7275
supl secure socket: on
agps mode: supl
hope these can be of use for someone, please note im in the uk.
edit: just tested out my window and got 8 found / 8 locked satalites in 12 secs

Things are getting even more weird...
I was browsing around in the jupiter.xml file shipped in the JP2 firmware and found what I suspect must be a a typo:
arp-supl-reaiding-time-sec = "1200"
Shouldn't that be: arp-supl-reading-time-sec = "1200" ?
With all that mucking about with wads of configuration files and a bazillion places where (conflicting) settings can be made, this doesn't exactly make me feel better about the reliability of AGPS on this device.
edit: nah, probably not a typo (read as 're-aiding', duh) but an unfortunate name choice anyway. At least it appears consistent with what the app is expecting.

for anyone with gps problems!

See this thread, it fixed mine completely!
forum.xda-developers.com/showthread.php?t=1239713

My gps was fixed when i flashed the aGPS Patch and has'nt been faster since.

jkolner said:
My gps was fixed when i flashed the aGPS Patch and has'nt been faster since.
Click to expand...
Click to collapse
That did nothing for mine, but this worked wonders.

scoobysnacks said:
That did nothing for mine, but this worked wonders.
Click to expand...
Click to collapse
Thanks for the wealth! Im really loving this forum because of friendly members like you

Luck515 said:
Thanks for the wealth! Im really loving this forum because of friendly members like you
Click to expand...
Click to collapse
Thank you did it work as well for you as it did for me?
I get a lock almost instantaneously now, even with only gps on (not wireless location)
It is insanely precise too, it said within 3 meters.

Just flashed agps worked for me scoob which is weird, but you tried world wide I just downloaded the GPS.conf only file flashed it connects fine. I'm in Ontario with virgin

itsbeertimenow said:
Just flashed agps worked for me scoob which is weird, but you tried world wide I just downloaded the GPS.conf only file flashed it connects fine. I'm in Ontario with virgin
Click to expand...
Click to collapse
Tried a ton of his patches and they didn't help.
This method gives me a lock in about a second and amazing precision so ill stick with this

Yeah might try it when I get to a desktop. Plus those guys in those threads were dicks.

itsbeertimenow said:
Yeah might try it when I get to a desktop. Plus those guys in those threads were dicks.
Click to expand...
Click to collapse
Agreed lol..
I just used root explorer to copy his example, then changed the server names myself.
Cleared the original gps.conf using "open in text editor " and pasted it in there.
Saved it, and rebooted and voila, fantastic gps finally!

I've always complained about my GPS not as fast and stable as my last Hero. Previously I thought the reason is the antenna design of IncS in the back cover.
But a few days ago I had a chance to compare my phone with another IncS side by side. And to my surprise, the GPS of the other IncS works much better than my. It found more sats than mine and all the signals are stronger too in GPS Status. I tried switching the back cover which made no difference at all.
So I conclude that it's my phone which has a hardware problem. Either it's using an inferior chip or there's some loose connection inside or something.

and why not use the best of both worlds and try to understand some of the values of gps.conf line by line to learn to code it ourselves for our needs.
I hope that some people will try to understand that sharing and learning is more important.
So i decided to search it myself. I haven't finished and it can take some time. But I would welcome anyone with the knowledge to share it here.
for example in this thread http://forum.xda-developers.com/showthread.php?t=1239713 some values have comments which is good but should be more explanatory
here are some things from google (translation is bad but you'll get the point about the INTERMEDIATE_POS and ACCURACY_THRES)
http://goo.gl/x1Q8M
By default, GPS enabled for some time, will be in the intermediate state, then have the coordinates can give some inaccurate information. Only when the GPS positioning is successful, will enter the final state, when it reports to the successful positioning of the application, the output coordinate information. I have encountered many of the satellite signal can be locked, but can not locate the problem, because when the GPS has also been in the intermediate state, the delay in entering final state.
INTERMEDIATE_POS this parameter, under normal circumstances should be set to 0, that is, only when the GPS positioning into the final state after that success. But in fact, more satellites in the lock, even if did not enter the final state, the output coordinates can also be very high accuracy. So we can INTERMEDIATE_POS set to 1, allows the GPS in the absence of final state before entering the coordinates of the output inaccurate information, to improve the "positioning" Speed.
In INTERMEDIATE_POS = 1 时, ACCURACY_THRES control when the value of accurate GPS coordinates to the number range of information starts outputting coordinate information, the unit is meters. For example ACCURACY_THRES = 200, meaning that even if no GPS positioning, as long as it coordinates the output error is less than 200 meters, output began to coordinate information from the application point of view, this also like positioning success.
Click to expand...
Click to collapse
I would like again to urge that people that know to share
edit--------------------------
other info
http://www.gpsworld.com/gps/wireless-choices-lbs-control-plane-and-user-plane-architectures-1576
Control plane architecture was designed to provide a location estimate in conjunction with an E911 call. The goal
was to provide high-accuracy, high availability location response to emergency service providers. The positioning capa-
bility would have to handle location requests that could come at any time and from any environment, and no prior
events — such as the opportunity to do a fix outdoors first to optimize GPS receiver sensitivity — could be assumed.
User plane architecture was designed to provide increasing user convenience in terms of speed, accuracy, and ease of entry
for location information in non-emergency use. Current limitations of device size and existing user input devices make
user entry of position both cumbersome and timeconsuming. Auto-location makes the process much simpler, friend-
lier, and more expedient.
Click to expand...
Click to collapse

itandy said:
I've always complained about my GPS not as fast and stable as my last Hero. Previously I thought the reason is the antenna design of IncS in the back cover.
But a few days ago I had a chance to compare my phone with another IncS side by side. And to my surprise, the GPS of the other IncS works much better than my. It found more sats than mine and all the signals are stronger too in GPS Status. I tried switching the back cover which made no difference at all.
So I conclude that it's my phone which has a hardware problem. Either it's using an inferior chip or there's some loose connection inside or something.
Click to expand...
Click to collapse
Did you try this though even just to see

scoobysnacks said:
Thank you did it work as well for you as it did for me?
I get a lock almost instantaneously now, even with only gps on (not wireless location)
It is insanely precise too, it said within 3 meters.
Click to expand...
Click to collapse
Yes mine is insanely fast and the steps to do it was like so easy!! Wooohoo now I can use maps to see where I'm going even without turning on the GPS option.
Sent from my Incredible S using XDA Premium App

Is 30metres - 50 metres accuracy good?
Sent from my Incredible S using XDA Premium App

Luck515 said:
Is 30metres - 50 metres accuracy good?
Sent from my Incredible S using XDA Premium App
Click to expand...
Click to collapse
It isn't bad.
I get about 5 meters accuracy.

I can't find the original gps.conf file on my phone (running CM7 using file manager). is it possible to just mount my phone to PC and put the file there - I created one in notepad using his first post. I can't find the file to replace it with...the /etc path has no gps file.

key2gb said:
I can't find the original gps.conf file on my phone (running CM7 using file manager). is it possible to just mount my phone to PC and put the file there - I created one in notepad using his first post. I can't find the file to replace it with...the /etc path has no gps file.
Click to expand...
Click to collapse
system/etc folder.

key2gb said:
I can't find the original gps.conf file on my phone (running CM7 using file manager). is it possible to just mount my phone to PC and put the file there - I created one in notepad using his first post. I can't find the file to replace it with...the /etc path has no gps file.
Click to expand...
Click to collapse
Use root explorer it's under /system/etc

scoobysnacks said:
Did you try this though even just to see
Click to expand...
Click to collapse
Yes, I tried several of these GPS optimization scripts. Frankly, the effect is very limited in my case. So I believe software is not the root of my problem.

This work well for me, tried aGPS Patch, it didn't work though.

GNSS: Gaiileo?, dual frequency?

There is almost no information on GNSS. It probably has Galileo given that the previous generation of Huawei phones did - but some preview sites say yes others no.
The Broadcomm BCM4775x dual frequency (L1 L5) chips were predicted to lead to smartphones with < 1m GNSS accuracy this year. So far there are only two devices that have been seen in the wild and the only phone is the Exynos (EU and parts of Asia) version of the Samsung S9 Plus. Samsung has not announced or documented it or provided any interface in their software and in the relevant xda thread, the owners have not yet been able to confirm that the L5 signal is accessible .
The previous generation of Huawei phones used the Broadcomm GNSS chip prior to the BCM4775x series. We probably won't know what the p20 pro is using until there is a teardown.
If the leakers are to be believed the only two brands that will not use Snapdragon/ Qualcomm SOCs in their flagship phones this year are Huawei and Samsung. As Broadcomm and Qualcom are archrivals/ probably incompatible, Huawei would seem to be the best hope for dual frequency cm accuracy in a phone this year.
Anyone know any more?

It' a shame for a new SOC but no galileo on Kirin 970
http://translate.google.com/transla...é-galileotap-to-wakedolphin-résolu/&sandbox=1
https://www.usegalileo.eu//FR/inner.html#data=smartphone

Even if the p20 pro is not Galileo enable, the most important is it dual frequency capable? Coz gps, glonass and beidou are not few also

mkstowegnv said:
Anyone know any more?
Click to expand...
Click to collapse
The binaries on the P20 vendor partition are for BCM4774 as on older phones.
It supports Galileo (you must download LTO from the internet), but is L1-only.

cr2 said:
The binaries on the P20 vendor partition are for BCM4774 as on older phones.
It supports Galileo (you must download LTO from the internet), but is L1-only.
Click to expand...
Click to collapse
Thanks! When I tried to download the leaked firmware for the p 20, it was 8 Gb unpacked and I had to give up looking inside. Just for the record, if you did the work of finding BCM4774 evidence in the partition (thank you) would you be so kind as to give us a little more detail - even some code snippets if possible (like the xda ers who found and posted firmware evidence for the BCM4775x in the Samsung s9+ - Exynos version).
As you imply and as I understand it, the BCM4774 supports Galileo. But when various people have run GPStest and similar software on various phones, my (limited) understanding is that the phones were getting fixes without an internet connection. I am confused and less informed that I need to be, but do you think that P20 users would need an internet connection to get a Galileo fix? (or are you just saying that it would be a better fix?).
When you say "you must download LTO from the internet" I assume you are referring to the LTO in the following quote from https://www.broadcom.com/products/wireless/gnss-gps-socs :
"In addition to the GNSS receiver chips, Broadcom provides Assisted-GNSS (A-GNSS) and Long Term Orbits (LTO) services. These services are provided from highly reliable cloud-based servers that are fed from a proprietary World-Wide Reference Network (WWRN) stations that collect world-wide GNSS satellite data."

cr2 said:
The binaries on the P20 vendor partition are for BCM4774 as on older phones.
It supports Galileo (you must download LTO from the internet), but is L1-only.
Click to expand...
Click to collapse
Ifixit now has a teardown which confirms the presence of the BCM4774. I put the comment below in Step 10:
Not highlighted is the GNSS Location Hub BCM4774IUB2G above and to the left of the BCM43596 (green). This means that provided the software/ firmware is amenable, this phone should make use of signals from the Galileo satellites (https://www.broadcom.com/products/wirele... ). This is something that different websites and Huawei itself have been inconsistent in reporting.

I tried GPS Satellites Viewer yesterday evening, and it showed me 3 Galileo Satellites without the download of anything. I tried it in the morning again and now I do not find any Galileo satellites... its strange.

Zingel1986 said:
I tried GPS Satellites Viewer yesterday evening, and it showed me 3 Galileo Satellites without the download of anything. I tried it in the morning again and now I do not find any Galileo satellites... its strange.
Click to expand...
Click to collapse
Many apps do not show Gallileo. GPSTest by barbeauDev works.
But it takes a little bit longer until the Gallileo satellites appear in the list.

Dual frequency GNSS accuracy screenshots

With the December 2019 update for the Pixel 4 and Pixel 4 XL, users now have access to the L5 (US) and E5a (EU) satellite signals. Let's see what you're getting for accuracy.
It seems, to me, that Android has imposed a hard-coded minimum limit on the horizontal accuracy. I initially blamed an app, but it seems like it's Android which has gone from 6ft accuracy to 9.9ft (2012-2013, if I recall correctly) to now 12.4ft (2017-2018) horizontal accuracy. That doesn't make sense to me, unless it's really just v2 of Selective Availability, now client-side. I remember reading, somewhere, about another dual frequency gnss phone receiving l5/e5a signals, but the article stated that those weren't actually being used in measurements. GPSTest shows "U" for them, so I'm not sure why accuracy is no better than before, unless the software is limiting it.
Here's the gold-standard everyone has used for a few years (it's "GPSTest", not to be confused with the countless "GPS Test" apps):
https://play.google.com/store/apps/details?id=com.android.gpstest
It's not consistent in receiving L5/E5a, and that may be because it's heavily overcast in my area of Texas today. My screenshots are from indoors, on this overcast day. "Force full GNSS measurements" is enabled in developer options, although I've not noticed any subjective difference it makes, through all of the months I've used it.
Two screenshots:
https://imgur.com/a/6W6PeKC

Do you mind uploading your gps.conf file? And what carrier do you have?
Jon8RFC said:
With the December 2019 update for the Pixel 4 and Pixel 4 XL, users now have access to the L5 (US) and E5a (EU) satellite signals. Let's see what you're getting for accuracy.
It seems, to me, that Android has imposed a hard-coded minimum limit on the horizontal accuracy. I initially blamed an app, but it seems like it's Android which has gone from 6ft accuracy to 9.9ft (2012-2013, if I recall correctly) to now 12.4ft (2017-2018) horizontal accuracy. That doesn't make sense to me, unless it's really just v2 of Selective Availability, now client-side. I remember reading, somewhere, about another dual frequency gnss phone receiving l5/e5a signals, but the article stated that those weren't actually being used in measurements. GPSTest shows "U" for them, so I'm not sure why accuracy is no better than before, unless the software is limiting it.
Here's the gold-standard everyone has used for a few years (it's "GPSTest", not to be confused with the countless "GPS Test" apps):
https://play.google.com/store/apps/details?id=com.android.gpstest
It's not consistent in receiving L5/E5a, and that may be because it's heavily overcast in my area of Texas today. My screenshots are from indoors, on this overcast day. "Force full GNSS measurements" is enabled in developer options, although I've not noticed any subjective difference it makes, through all of the months I've used it.
Two screenshots:
https://imgur.com/a/6W6PeKC
Click to expand...
Click to collapse

slyyke said:
Do you mind uploading your gps.conf file? And what carrier do you have?
Click to expand...
Click to collapse
Attached with appended .txt extension so that it would upload without having to be zipped.
Google store edition Pixel 4 on Visible (Verizon Wireless's in-house MVNO).

The GPS accuracy here post December update seems to have degraded as well. I had hoped that dual frequency performance would improve both the reliability of reception and overall accuracy but that has not been the case, while it is currently acceptable the position "walks" quite a bit so lane-level positioning seems as distant as ever.
Kalman filters seem to reduce this error but I haven't had the time to thoroughly test. I have always suspected that the inclusion of additional sensor input(barometer, gyroscope and accelerometer) for a IMU approach would assist.
Let's hope additional updates will address this including use of the Galileo GNSS constellation.

Dual GPS Functionality Disable After Updated to Android 10/MIUI 11

I have a Mi 9 and recently updated via OTA to Android 10 with the bundled MIUI 11. I'm now running MIUI 11.0.6.0 (QFAEUXM) Global Stable.
I just noticed that the Dual GPS option have disappeared from the drop down quick settings, and was replaced by just a "Location" toggle. I used a GPS checker app, and indeed, the dual GPS was somehow disabled or disappeared after the update as it was only showing L1 and E5 bands. For dual bands, the L5 and E5a should also be displayed on the GPS tracker app as well.
Is there a way I can enable the dual GPS back? It's not a major issue, but it will be disappointing as the dual-band GPS was really useful during the short time I used it prior to the update and also one of the reasons why I got this device.

Cherby21 said:
I have a Mi 9 and recently updated via OTA to Android 10 with the bundled MIUI 11. I'm now running MIUI 11.0.6.0 (QFAEUXM) Global Stable.
I just noticed that the Dual GPS option have disappeared from the drop down quick settings, and was replaced by just a "Location" toggle. I used a GPS checker app, and indeed, the dual GPS was somehow disabled or disappeared after the update as it was only showing L1 and E5 bands. For dual bands, the L5 and E5a should also be displayed on the GPS tracker app as well.
Is there a way I can enable the dual GPS back? It's not a major issue, but it will be disappointing as the dual-band GPS was really useful during the short time I used it prior to the update and also one of the reasons why I got this device.
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I'm on xiaomi eu 9.11.28 and what i see is: L1 and L5 for GPS, L1 for GLONASS , E1 and E5a for Galileo, B1 for BeiDou and L1 and L5 for as i understand QZSS (Japan)
As i understand it's not the option was disappeared, it's just the icon has been changed

Hey, I am also on 11.0.6.0 and have noticed the same missing information and icons for dual GPS functionality. However, I ran the GPSTest app and you can check the attachment.. Just note that I am in the southern hemisphere and did the test indoors.

Double gps icon removed. All gps managers work.

Here's a screenshot from the GPSTest app. Not a single L5 or E5a frequency is shown.

Cherby21 said:
Here's a screenshot from the GPSTest app. Not a single L5 or E5a frequency is shown.
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May be it's because of your region. Xiaomi love to make things available or not available depending on were you live.

Cherby21 said:
Here's a screenshot from the GPSTest app. Not a single L5 or E5a frequency is shown.
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This just depends on your current location. As you can see from the flags you're receiving GPS, Glonass and Galileo satellites. Furthermore if you click 'Sky' in the menu you'll see the current satellites and their respective system in a celestial view.
Cheers
Toscha

Just wanted to chime in as a Pixel 4 user.
I get L5/E5a in the USA, but it isn't instant. I have to sit there with the GPSTest application open, and eventually it picks them up. It's not an instant lock even though L1 is instant, and usually not within 15 seconds, despite already having locked on to the satellites which output L5/E5a signals.
On top of that, the L5/E5a bands don't stay locked. After being locked for a short period (maybe 2 minutes?), then they all disappear, and then take some time to come back, then all eventually disappear again. I have GNSS duty cycling disabled in developer options. I think it's a bug, in addition to the minimum accuracy in Android being hard-coded to not calculate better than 12.4ft/3.8m for horizontal and 8.2ft/2.5m for vertical:
https://issuetracker.google.com/issues/146010208

Deleted

Jon8RFC said:
Just wanted to chime in as a Pixel 4 user.
I get L5/E5a in the USA, but it isn't instant. I have to sit there with the GPSTest application open, and eventually it picks them up. It's not an instant lock even though L1 is instant, and usually not within 15 seconds, despite already having locked on to the satellites which output L5/E5a signals.
On top of that, the L5/E5a bands don't stay locked. After being locked for a short period (maybe 2 minutes?), then they all disappear, and then take some time to come back, then all eventually disappear again. I have GNSS duty cycling disabled in developer options. I think it's a bug, in addition to the minimum accuracy in Android being hard-coded to not calculate better than 12.4ft/3.8m for horizontal and 8.2ft/2.5m for vertical:
https://issuetracker.google.com/issues/146010208
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Same. I just noticed the L5 and E5a bands take a while to lock on, or at least only appear at certain times (mostly at night) on my region (Southeast Asia).

Jon8RFC said:
Just wanted to chime in as a Pixel 4 user.
I get L5/E5a in the USA, but it isn't instant. I have to sit there with the GPSTest application open, and eventually it picks them up. It's not an instant lock even though L1 is instant, and usually not within 15 seconds, despite already having locked on to the satellites which output L5/E5a signals.
On top of that, the L5/E5a bands don't stay locked. After being locked for a short period (maybe 2 minutes?), then they all disappear, and then take some time to come back, then all eventually disappear again. I have GNSS duty cycling disabled in developer options. I think it's a bug, in addition to the minimum accuracy in Android being hard-coded to not calculate better than 12.4ft/3.8m for horizontal and 8.2ft/2.5m for vertical:
https://issuetracker.google.com/issues/146010208
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Click to collapse
It's looks like app scanning for satellite signals. It's not like it's need just to find 3-4 satellites and calculate your location, it's looking for all available satellites and from all available systems (GPS, GLONASS, Galileo and etc.). So i don't think it's a bug it's just a scanning process and it takes some time.
In sky view you can see how statuses of satellites changes in live, so it's not only scan it's a live endless scan process

Here're two screenshots, linear distance of the measurement approx. 50 km. It's also different days (December 17, December 19) as well as different times (12:15 pm, 4 pm). However there're significantly less satellites on the latter screenshot. But in both cases L1 and L5, meaning dual frequency GNSS.
Cheers
Toscha

I have a Xiaomi Mi 9T Pro, Global version (I'm in Europe), running MIUI 11.0.3.0 Stable on Android 10. What I've noticed is that while I do have the Dual Frequency icon and the signals are tracked, they are not used. I'm sure that they were used before, but don't remember if it was before or after updating to Android 10. It does take a few seconds for L5/E5a frequencies to appear using GPSTest, but hen they appear without a problem. But they never show the flag "U", which means "Used". So it's pretty much the same as not having them. I'll test other days and outdoors to see if it's always the same.

I have my MI 8 recently updated to Android 10 MIUI 11.0.3.0 (QEAMIXM) Global Stable. After this, no Galileo Signal is available any more. Under Android 9 it was already working. Hope they will fix this issue.