Having the train use Bluetooth Low Energy advertising to broadcast its location and some other data, like time-to-next station, next station name, would be a nice feature.
GPS spoofing should not be done in my opinion until the negative side-effects are well understood.
This is the case in some stations in Paris. To retrofit ancient trains with station announcements, they have installed Bluetooth broadcasters on each station so the train can detect when it enters/leaves and announce the next station for visually impaired people. Smart and simple imo.
Ona similar note I always thought it would be cool if there was a standard allowing (trusted) WiFi access points to relay location data, so that in-flight WiFi could pass on the plane's GPS feed.
No need; phones use sensor fusion these days. Wifi, ble, 4G/5G base stations, signals, etc. it's all taken into account. Which is why you can get accurate position in a lot of places where you definitely don't have any line of sight to any GPS satellites. Some of the more recent wifi standards also have some positioning features.
Early Android dev had a guide on how devs could pick the best location from various sources individually, and it was massive pain with dubious results.
You'd need to spoof at least three satellites to get a fix, right? And then you'd need to spoof different signals for different regions of the subway, because your signal sources aren't really in the orbit.
Sounds to me this could be very complicated and expensive. I wonder if it would even be possible because you'd need to have the same signal spoof the correct positions to everyone who hears that signal.
Well, you are not a GPS satellite, so you are indeed spoofing military equipment.
On a serious note, I recall that smartphone location in metro in my city started to "just work" as soon as all stations and tunnels had indoor cell towers. Suddenly all apps worked fine and I forgot that problem ever existed.
Modern location detection is as scary as it is amazing.
qwertox|1 year ago
GPS spoofing should not be done in my opinion until the negative side-effects are well understood.
h1fra|1 year ago
https://www.leparisien.fr/info-paris-ile-de-france-oise/tran...
gield|1 year ago
[1] https://support.google.com/waze/partners/answer/9416071
flemhans|1 year ago
jillesvangurp|1 year ago
cryptoz|1 year ago
dietr1ch|1 year ago
_flux|1 year ago
Sounds to me this could be very complicated and expensive. I wonder if it would even be possible because you'd need to have the same signal spoof the correct positions to everyone who hears that signal.
szszrk|1 year ago
On a serious note, I recall that smartphone location in metro in my city started to "just work" as soon as all stations and tunnels had indoor cell towers. Suddenly all apps worked fine and I forgot that problem ever existed.
Modern location detection is as scary as it is amazing.
RobotToaster|1 year ago