Database Develop

How bad the GPS problem is?

Lets see if I understand this correctly....
on the samsung galaxy s GPS system, there are 2 options:
1)Use wireless networks: Set the device to use the
wireless networking to indicate your location
2)Use GPS satellites : Enable the GPS receiver to indicate your location
For now, we know that using the option 2 gives us crappy results (loosing signals, cannot lock sattelites, jumping around etc)
Now, for option 1: choosing option 1 means that launching the maps application should indicate where your location is currently by using some kind of triangulation method based on the availability of GSM signal, so it should even work when you are indoor or whenever there is a GSM signal......
But apparently on this phone, it only shows your initial location, then after that even if you have moved 1 km from your initial location, the location indicator arrow is stuck at your initial location, meaning that it doesnt track you and your movement, which means both options simply dont work on this phone....
On my wife's iphone, the GPS functionality works wonderfully even when i am inside a building and it keeps updating your location as you move continuosly.
It just shows you how careless and hasty samsung is in launching this product that even the simplest form of GPS functionality, one that is based on GSM triangulation method, also doesnt work..... and they still went ahead with the launch.....

Absolutely no problems with GSM or GPS positioning now that I'm using I9000XWJG5. Locks on satellites within 22 seconds from switch on. Thats at 30m precision. After 10 seconds more gets to 5m precision.
This is from inside my building. (Using GPS Status to check)

Same here. Your wife's phone probably also uses the mobile network to keep location inside buildings, or wireless networks. Try enabling skyhook, that is all i did.

used skyhook, and assited mode, accuracy set to 50, changed supl/cp settings, but compared to my g1 or hd2 or e61 or 10 year old bt/gps mouse the gps quality is just rubbish. (XXJF3)

no problem even without skyhook, but using skyhook gets locking much faster
i'm comparing it to my old HTC Athena, which takes sometimes over 5min to lock to 1 satellite in the great white open sky.... sigh...
sometimes it wont even lock if the weather is poor, takes like 30min or more to lock, under those conditions.
simply insane.
so SGS i9000 is like a dream to use.

g1 / hd2 / e61 only take seconds to get a full lock with accuracy about 3m. in my opinion skyhook and gps plus are needless if you have a working cb a-gps.

From my experience its the rom. As my gps worked fine with default FE3 (optus au) rom even indoors but when i flashed G5 (latest euro) i could only lock onto one sat outdoors even with skyhooks setting. Then i installed Samset 1.2 update.zip the gps works again, thats just my 2cents

widjaja74_us said:
It just shows you how careless and hasty samsung is in launching this product that even the simplest form of GPS functionality, one that is based on GSM triangulation method, also doesnt work..... and they still went ahead with the launch.....
Click to expand...
Click to collapse
For the record I haven't had any issues with GPS other than it being fair slower than my Milestone.
Didn't you sell your Galaxy S anyway?

Unimaginative said:
For the record I haven't had any issues with GPS other than it being fair slower than my Milestone.
Didn't you sell your Galaxy S anyway?
Click to expand...
Click to collapse
Hey mate, I think I've seen you around the WP forums.
Quick question for you - I have a Milestone and am currently contemplating throwing it on eBay and grabbing the Galaxy S. Is there anything you miss from the Milestone?

ShaggyDragon said:
Absolutely no problems with GSM or GPS positioning now that I'm using I9000XWJG5. Locks on satellites within 22 seconds from switch on. Thats at 30m precision. After 10 seconds more gets to 5m precision.
This is from inside my building. (Using GPS Status to check)
Click to expand...
Click to collapse
The same here. The problems start when I go out and start to drive around in my car. My GPS is absolutely useless when you move around outdoors, but locks in a few seconds indoors.

widjaja74_us said:
Lets see if I understand this correctly....
Click to expand...
Click to collapse
Let me see if I understand this correctly. You have sold your SGS and you are still coming back here to crap on about the GPS and other small things which are only occurring on some people's phones and not others?
For the record, everything on my phone has been running silky smooth since day one. Lag only occurs with too many apps open and this is to be expected from an operating system that can multitask.

navmanyeah said:
Let me see if I understand this correctly. You have sold your SGS and you are still coming back here to crap on about the GPS and other small things which are only occurring on some people's phones and not others?
For the record, everything on my phone has been running silky smooth since day one. Lag only occurs with too many apps open and this is to be expected from an operating system that can multitask.
Click to expand...
Click to collapse
I sold my phone at a profit because currently i cannot afford to have unreliable phone in doing my job... then i searched for something better and can't find any.... so i'm still following the forum to see of all the problems i experience have been fixed .... if thats the case, i might buy another one....
and for the record, i didnt crap about the GPS, i'm just investigating it deeper, becase GPS is important for me...
Thats crap for you

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.

[Q] general question about gps

Hey! I'm new to SGS captivate and to the whole gps thing and do have a question about the basic concepts (how does it work, how does it track you, etc etc) of gps on SGS. Is there some kind of manual or faq I can refer to? Google'ing doesn't work for me in this case and xda search gives no clear results.

Try Wikipedia
Wikipedia and Garmin and other sites have a lot of detail. Your question is so broad I am not sure I can answer it.
Basically, the phone has a special chip inside that is dedicated to deciphering the radio signals broadcast by an array (it's called a "constellation") of satellites. By locking onto several of these signals it can make available a stream of data to installed applications on the phone to interpret. The data can represent your position in space (x, y, and z) as well as time. Your location can now be displayed on a map (Google Maps is a fine example), as well as your speed (usually restricted to on the ground).
Important things:
Hardware: The GPS chip, the antenna
Software: The Samsung driver that interfaces the chip to the Android environment, the special applications that interpret and display this data in a useful fashion.
Performance: How accurate is your location? How quickly does the GPS acquire a "lock"? How well does the software/GPS track your changing location?
It appears that there is a wide variation in performance and expectations among the owners of these Samsung Galaxy S phones. My personal expectations have been based on several prior phones, and I find the Captivate performance to vary widely and randomly, depending on software builds/settings and the physical environment.
I have used this same phone with a cheap external Bluetooth GPS and found the performance dramatically better. I am not sure if the phone native GPS performance will ever live up to my expectations.

mmarquis said:
Wikipedia and Garmin and other sites have a lot of detail. Your question is so broad I am not sure I can answer it.
Basically, the phone has a special chip inside that is dedicated to deciphering the radio signals broadcast by an array (it's called a "constellation") of satellites. By locking onto several of these signals it can make available a stream of data to installed applications on the phone to interpret. The data can represent your position in space (x, y, and z) as well as time. Your location can now be displayed on a map (Google Maps is a fine example), as well as your speed (usually restricted to on the ground).
Important things:
Hardware: The GPS chip, the antenna
Software: The Samsung driver that interfaces the chip to the Android environment, the special applications that interpret and display this data in a useful fashion.
Performance: How accurate is your location? How quickly does the GPS acquire a "lock"? How well does the software/GPS track your changing location?
It appears that there is a wide variation in performance and expectations among the owners of these Samsung Galaxy S phones. My personal expectations have been based on several prior phones, and I find the Captivate performance to vary widely and randomly, depending on software builds/settings and the physical environment.
I have used this same phone with a cheap external Bluetooth GPS and found the performance dramatically better. I am not sure if the phone native GPS performance will ever live up to my expectations.
Click to expand...
Click to collapse
Thank you for the detailed info. Well, wiki does have some common overall thoughts about the gps system but I was more interested in SGS realization of it. I guess your post made it a little more clear for me, thanks!

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 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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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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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.