I'm curious if they'll make use of the L5 GPS band now that popular phones are getting it.
Rethinking GPS: Engineering next-gen location at Uber (2018)
31–40 of 69 posts
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#32Earlier quoted context omitted.
To oversimplify: It's on a different frequency and so will be subject to different forms of error. You can average the results of L1 and L5 to get a more accurate position.
Not just that. It's a higher frequency so the correlation peaks are more narrow and hence more easily distinguishable than L1 frequency
That's not how it works at all. L5 at 1176 MHz has a different ionospheric delay than L1 at 1575 MHz. Since the timing data is identical, you can calculate and remove the ionospheric delay if you can receive both signals at once.
Correlation peak width is an SNR property (and to a lesser extent dependent on receiver LO phase noise), not something that really corresponds to the RF band in use. Whichever signal is stronger (taking antenna gain into account) is the one that will yield better-quality baseband data.
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#33Earlier quoted context omitted.
I think it says that FLP (Fused Location Provider) is not built in to Android.
FLP is an SDK available on Android devices with Google Play Services ( https://developer.android.com/training/location/request-upda... ). According to the blog post, it should theoretically be rolled out to any phone with Android 8 or later. The Uber blog post is from 2018, and Google's implementation came in 2020.
I tried to enter "now" and the stupid phone decided I was going for "not".
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#34Earlier quoted context omitted.
Almost like they wrote a blog article about it so others could learn from it. If it were available to all android apps I don't know why Uber would go out of their way to reimplement it. So it must not be available to all apps and exclusive to Google maps and Waze
Uber's post is actually two years older than the Google one.
> April 19, 2018 / Global
Yes, original post needs a (2018) in the title.
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#35What happened to the next gen gps technology, I thought it was supposed to be out by now. Centimeter level precision, much better urban (blocked by buildings) accuracy, etc?
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#36L5 GPS will address the multipath-in-urban-canyon problem that Uber worked on.
If you're curious which phones support L5, check out the table linked on this page (SCROLL DOWN to "GPSTest Database" for the up-to-date table, since the first one is out of date): https://barbeau.medium.com/9be4bbb83a7b
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#37What happened to the next gen gps technology, I thought it was supposed to be out by now. Centimeter level precision, much better urban (blocked by buildings) accuracy, etc?
It's not a single technology but multiple gradual improvements. E.g. since yesterday even iPhones have dual-frequency L5 GPS which improves accuracy in some situations: https://news.ycombinator.com/item?id=32790478
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#38[deleted]
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#39https://news.ycombinator.com/item?id=16887276
Old HN thread
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#40What happened to the next gen gps technology, I thought it was supposed to be out by now. Centimeter level precision, much better urban (blocked by buildings) accuracy, etc?
GPS already has centimeter level precision. iPhone 14 will support the new L5 GPS signal