Rob, What exactly do you mean by GPS over wifi?
Do you mean sending location/course/speed/etc. data over wifi? Or somehow replicating the actual GPS satellite data? I don’t see how the latter would work giving the timing requirements. There are lots of current practice in sending NMEA sentences over IP networks. I don’t know how well this is specified, but I have several devices that do this. Bob On Jan 22, 2020, at 4:05 AM, Rob Brew <[email protected]> wrote: > > > Hi, > > Except when you can install a GPS repeater. > > We already have wireless networks covering each area of tube stations, this > makes the porvisioing of such functionality cheaper as the infrastructure is > already there, > > > I need to look at it. > > Until then, I can tell that there is a GPS GATE software that captures > GPS signals and puts the data (NMEA?) on IP and distributes it to IP > receivers. These IP receivers might be on WiFi too. > > In this case, it might be that one needs to tell what is the format of > NMEA over IP. It's very simple. > > But, agreeing that NMEA is the best thing is a different thing. On one > hand, NMEA has new versions. But it uses WGS84 which might not be the > best coordinate system - it is good for smartphones and users, maybe > cars, but in some countries it is not used to locate some important > points. These use other coordinate systems. So maybe one wants to come > up with a more universal coordinate system that makes everyone happy, > and take _that_ and put on WiFi (not NMEA). Because, IP is such > universal, we should put universal things on it. > > Conversions between systems are huge opportunities for glitches to get > in. These kinds of glitches ahppening very fast and added up may lead, > and have led, to disasters. > > > As we know the IP Address contacting the server the server contains a > > map containing the GPS location of each underground site, as > > referenced by IP address. The returns the phsycial GPS location and > > name of the site as a JSON array. > > > > To prevent false servers reporting inaccurate information https can > > be used to verify the authenticity of the server. > > > > Providing this service to mobile phone user's without a current WIfi > > connection i propose going one stage further, create a hidden > > wireless network wih the name ".location". In cases where no GPS > > location can be found a mobile phone's GPS system can be programmed > > to seek such a network providing the same service. > > Hold on, 'hidden wireless network', make sure 'hidden terminal problem' > is distinguished. > > A phone that cant have WiFi connection - what kind of other IP > connection does it have, in a place that has no GPS coverage? Is it a > cellular connection in underground metro station? If yes, it means > either there are cellular base stations there, or there are cellular > repeaters: enhance them to repeat GPS as well. > > > > This would require alterations to th servics as provided by mobile > > phone providers such as Apple and Android. > > > > If you are interested in this concept please review it (and my code), > > and maybe it will become something. For a video demonstration of > > this service please check the link at the github site. > > I will look at the draft later. > > Alex > > _______________________________________________ > Int-area mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/int-area
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