[Q] Dual GPS - Huawei Mate 20 Pro Questions & Answers

What about the dual channel GPS?
Do you feel any differences comparing to your previous phone?

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A few quick tests over the past day or so have shown it to be a major step up from my Oneplus6 and the compass has been spot on

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chimpusmaximus said:
A few quick tests over the past day or so have shown it to be a major step up from my Oneplus6 and the compass has been spot on
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Could you make an video about with the app tested gpstest?

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aygul12345 said:
Could you make an video about with the app tested gpstest?
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Any use https://youtu.be/PQgIUiPCBFg

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chimpusmaximus said:
Any use https://youtu.be/PQgIUiPCBFg
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How long does it takes to get an fixed gps location?

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aygul12345 said:
How long does it takes to get an fixed gps location?
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1 sec for ttff

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Dual frequency GPS was a consideration to my purchase of this phone - hoping for great things, completely unknown to reality.
I work in the CBD and drive out of an underground car park. With my Samsung S8 and later a work provided Motorola g5s Plus it took a small but considerable amount of time for Google Maps to pick up where I was exactly - sometimes would pick me up in another street, adjusting until it got its lock on me.
Using the Mate 20 Pro, OMG.... I am stoked! Just as I'm coming out of the car park (maybe 2 or so metres before actual sight of sky) Google Maps has an accurate pin of where I am. This invaluable (apart from Maps telling me best way home traffic wise immediately) as I use a Vehicle Log Book which obviously relies on GPS as well. Normally i've been at least 1km away before the Log Book app recognised I was actually driving in the CBD.
Absolutely love this dual frequency GPS as I assume this is what has made picking up my location in CBD enormously quicker.

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ero69 said:
Dual frequency GPS was a consideration to my purchase of this phone - hoping for great things, completely unknown to reality.
I work in the CBD and drive out of an underground car park. With my Samsung S8 and later a work provided Motorola g5s Plus it took a small but considerable amount of time for Google Maps to pick up where I was exactly - sometimes would pick me up in another street, adjusting until it got its lock on me.
Using the Mate 20 Pro, OMG.... I am stoked! Just as I'm coming out of the car park (maybe 2 or so metres before actual sight of sky) Google Maps has an accurate pin of where I am. This invaluable (apart from Maps telling me best way home traffic wise immediately) as I use a Vehicle Log Book which obviously relies on GPS as well. Normally i've been at least 1km away before the Log Book app recognised I was actually driving in the CBD.
Absolutely love this dual frequency GPS as I assume this is what has made picking up my location in CBD enormously quicker.
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Can you give us an update on your sentiment towards the GPS accuracy and precision? I’m very curious if you have to contend with a lot of skyscrapers, like in Manhattan New York. I have also been at intersections in Japan where it instead of a four way intersection you’ll have an eight way intersection and if you don’t have absolute accuracy with your GPS you will go down the wrong road. What are your thoughts?

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chimpusmaximus said:
1 sec for ttff
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Wich app is to see the satalites
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chimpusmaximus said:
Any use https://youtu.be/PQgIUiPCBFg
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I watched the video, sorry to say (and also sad to know) that dual GPS is not yet enabled. you need to see a single GPS satellite outputting two frequencies namely L1 and L5 (CF), or to put it in another way, the app should show two similar IDs for the respective GNSS.
I remember someone saying that they did see L5/E5 enabled in 9.0.0.171.
If there is a reliability/lock improvement via Google Maps, it's because of 9.0.0.146 update.
L5/E5 features and benefits over L1:
1) Improved ionospheric correction
2) Signal redundancy
3) Improved signal accuracy
4) Improved interference rejection
5) L5 is, to date, the most advanced civilian GPS signal
6) It transmits at a higher power than current civil GPS signals --> RELIABILITY
7) Has a wider bandwidth: Its lower frequency may also enhance reception for indoor users

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Interesting article about Dual GPS implementation on recent android smartphones, from the author of GPStest:
https://medium.com/@sjbarbeau/dual-frequency-gnss-on-android-devices-152b8826e1c

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Dual frequency GPS test
I used this app for testing the dual frequency GPS:
Geo++ RINEX Logger
https://play.google.com/store/apps/details?id=de.geopp.rinexlogger
and apparently it shows the GPS module to synch with:
GPS L5
GALILEO E5a
:good:
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"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
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"lightbox_new_window": "New window",
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Test performed indoor, Mate 20 Pro firmware just updated to v.153.

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themissionimpossible said:
I used this app for testing the dual frequency GPS:
Geo++ RINEX Logger
https://play.google.com/store/apps/details?id=de.geopp.rinexlogger
and apparently it shows the GPS module to synch with:
GPS L5
GALILEO E5a
:good:
Test performed indoor, Mate 20 Pro firmware just updated to v.153.
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Click to collapse
I tried this on 146, results are the same. But I still feel Dual GPS is not enabled fully.
notice that there is not even a single Multipath L5/E5 lock although they are detected. Red bars should appear for all four of them. Also we need to wait for another 4-5 years to be able to see ~30 cm accuracy because currently a handful of satellites are offering L5/E5 and by 2022 it is predicted to rise to ~24 satellites.
btw cycle slips gives an estimate of GPS accuracy because L5 signal power is around 3dB more than L1 and chances of phase lock disconnections due to cloud/rain/trees/buildings etc will be relatively less as compared to L1.
Multipath is to do with GPS reliability: if you are getting quick GPS locks inside your house while you are away from window, then you must be thanking L5 multipath signals..
Also, trade-off for accuracy is reliability, not the other way round: this means that the good will not get that better but, importantly, the bad will not get worse..
Cycle Slips: https://www.e-education.psu.edu/geog862/node/1728
Multipath: https://www.e-education.psu.edu/geog862/node/1721

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Probably in my case the app doesn't detect multipath just because I'm currently in a house located in a flat country with open sky and no buildings higher than 6 meters and nearer than 50 meters in the surroundings.

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themissionimpossible said:
Probably in my case the app doesn't detect multipath just because I'm currently in a house located in a flat country with open sky and no buildings higher than 6 meters and nearer than 50 meters in the surroundings.
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actually that should have been the case since multipath is situational
but L1 Multipath is functioning?
could someone with 171 test GPS because I read somewhere that GPSTest app is showing both L1 and L5 CF for some of the GNSSs in 171.

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rakesh2002 said:
actually that should have been the case since multipath is situational
but L1 Multipath is functioning?
could someone with 171 test GPS because I read somewhere that GPSTest app is showing both L1 and L5 CF for some of the GNSSs in 171.
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Nothing showing in the CF column in 171.

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Classic article
themissionimpossible said:
Interesting article about Dual GPS implementation on recent android smartphones, from the author of GPStest:
https://medium.com/@sjbarbeau/dual-frequency-gnss-on-android-devices-152b8826e1c
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Click to collapse
I also read Sean Barbeau’s article on dual frequency GPS with great anticipation. From all indications, dual frequency GPS on smart phones from a real world USE perspective has been a total bust to date. Although companies like Xiaomi and Huawei trumpeted this as a great achievement, no one has realized any practical decimeter-level accuracy benefit. To be fair, there are possibly faster lock times reported but not substantiated..
What an unfortunate situation. I double checked the Xiaomi forums to ensure there has not been any tremendous development as far as 30 cm accuracy. After all, they’ve had nearly a year to work out any kinks. As of this date there has not been anything close to 30 cm accuracy substantiated.

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themissionimpossible said:
Interesting article about Dual GPS implementation on recent android smartphones, from the author of GPStest:
https://medium.com/@sjbarbeau/dual-frequency-gnss-on-android-devices-152b8826e1c
Click to expand...
Click to collapse
themissionimpossible said:
I used this app for testing the dual frequency GPS:
Geo++ RINEX Logger
https://play.google.com/store/apps/details?id=de.geopp.rinexlogger
and apparently it shows the GPS module to synch with:
GPS L5
GALILEO E5a
:good:
Test performed indoor, Mate 20 Pro firmware just updated to v.153.
Click to expand...
Click to collapse
Thanks for this link
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---------- Post added at 19:02 ---------- Previous post was at 18:56 ----------
Mulitpath is not locking... Is that normal?
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---------- Post added at 19:02 ---------- Previous post was at 19:02 ----------
Mulitpath is not locking... Is that normal?
Sent from my LYA-L29 using Tapatalk

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themissionimpossible said:
Interesting article about Dual GPS implementation on recent android smartphones, from the author of GPStest:
https://medium.com/@sjbarbeau/dual-frequency-gnss-on-android-devices-152b8826e1c
Click to expand...
Click to collapse
Still no support for Huawei mate 20 pro.
. 153 build.
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.232 has CF values in GPSTest for Mate 20 Pro