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Rethinking GPS: Engineering next-gen location at Uber (2018)
41–50 of 69 posts
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#42Most of the Uber cabs work in urban settings where there are bunch of Wi-Fi enabled. Could they use the Wi-Fi to pinpoint the location instead of relying on GPS? Probably they can setup some relay nodes on their own for coverage.
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#43Earlier quoted context omitted.
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 stro…
L5 has a 10 times higher modulation ("chipping") rate than L1/2 which does lead to a narrower correlation peak width. However, it doesn't solve the multipath problem near tall buildings.
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#44[deleted]
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#45No post body was provided.
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#46No mention of iOS in the video or article. Anyone knows if Uber does something similar on iOS, and if Apple has done any similar efforts in system-level APIs like Google has?
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#47L5 GPS will address the multipath-in-urban-canyon problem that Uber worked on.
It's not a perfect fix though. Even dual band multi network receivers will "jump around" a bit in deep canyons. Example: https://hikingguy.com/hiking-gear/garmin-gpsmap-66sr-review-...
Parent is talking about "urban canyons" which is just fancy wording for cities, while you're talking about actual canyons.
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#48What 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?
What others said + it depends on your location, different GPS satellites serve different continents (usually), so GPS might work better/worse in Europe compared to South Africa (as an example).
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#49https://news.ycombinator.com/item?id=16887276 Old HN thread
Thanks! Macroexpanded:
Rethinking GPS: Engineering Next-Gen Location at Uber - https://news.ycombinator.com/item?id=16887276 - April 2018 (102 comments)
Rethinking GPS: Engineering Next-Gen Location at Uber - https://news.ycombinator.com/item?id=17331841 - June 2018 (18 comments)
Re: Rethinking GPS: Engineering next-gen location at Uber (2018)
#50Quoted post unavailable.
Flamewar comments like this will get you banned here, so please don't post them.
If you wouldn't mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the intended spirit of the site more to heart, we'd be grateful.