I believe the various networks that supplement GPS/GNSS systems are called SBAS
(the USA has WAAS for aircraft)
and the fantastic opensource GPSTest app will show you what your device supports
Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
11–20 of 40 posts
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#12Earlier quoted context omitted.
> It's a bit of shame that the pricing seems to be rather steep for frivolous use The pricing norms for RTK correction networks were set 20 years ago, when operating your own base station meant buying a second $20,000 dual frequency receiver, and taking an extra guy any time you go out to do a survey, whose job is just to guard the base station. This made a $2000 a year network correction service seem like great valu…
This should be another crowdsourced sensor fabric network, like air quality sensors, AIS, ADS-B, distributed SDR, etc.
https://www.onocoy.com/ seems to be doing just that.
I have no affiliation, and no strong opinion on their specific approach, but I do find it interesting and have thought about running a node, especially since enjoying fiddling around with LoRa / Meshtastic.
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#13There was a survey of available GNSS corrections services from a couple of years ago - some of these services are global and not limited to a single country:
https://medium.com/@mikehorton/what-is-a-mass-market-gnss-co...
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#14I just learned that Switzerland has a nationwide RTK network for cm level positional accuracy using GPS, Galileo, GALILEO, and/or Beidou, GNSS systems. And they have a nice map of all the station locations[0]. It's a bit of shame that the pricing seems to be rather steep for frivolous use, but it seems to be rather new. It would be interesting to see what possibilities a totally free nationwide RTK system would open…
> It's a bit of shame that the pricing seems to be rather steep for frivolous use The pricing norms for RTK correction networks were set 20 years ago, when operating your own base station meant buying a second $20,000 dual frequency receiver, and taking an extra guy any time you go out to do a survey, whose job is just to guard the base station. This made a $2000 a year network correction service seem like great valu…
The swiss solution does come with per hour pricing but it's still 0.50 CHF / minute. Which is still very expensive for hobbyists.
I feel like the marginal costs for users is so low that it would be better if it were handled as a common good like GNSS systems themselves.
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#15I believe the various networks that supplement GPS/GNSS systems are called SBAS (the USA has WAAS for aircraft) and the fantastic opensource GPSTest app will show you what your device supports https://github.com/barbeau/gpstest
You're confusing 2 different things here. SBAS gets you (roughly) from 5m to 1m, to meet requirements for aviation use. RTK gets you from 5m to <0.1m. Both use base stations to monitor deviations, but for RTK the base station is intended to be <100km from you and the data needs to have as little delay as possible. SBAS base stations are a few per continent & don't care about delay to the same degree.
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#16It is worth mentioning that you can set up your own RTK installation buy grabbing 2 higher-end GNSS receivers¹, installing one of them in a fixed location with reasonable sky view, and measuring it in for a week or two. You can then feed correction data from that to your 2nd receiver. Search for RTKlib. (Some GNSS receivers even have built-in source & sink handling.)
Also, the GNSS software in most phones is sadly unable to accept the correction data from any of these systems, regardless of whether it's a nationwide network or your personal setup. This is purely a software limitation on the vendor GNSS stack, but sadly there is not enough demand for this. (An app will not fix this, we're talking vendor specific low level system code here.)
[¹] e.g. u-blox T/R series, but check specific descriptions about raw output/RTK capabilities, it changes between generations. You also want recent ones with RTCMv3, not RTCMv2.x.
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#17It is worth mentioning that you can set up your own RTK installation buy grabbing 2 higher-end GNSS receivers¹, installing one of them in a fixed location with reasonable sky view, and measuring it in for a week or two. You can then feed correction data from that to your 2nd receiver. Search for RTKlib. (Some GNSS receivers even have built-in source & sink handling.) Also, the GNSS software in most phones is sadly un…
Is that true even for the relatively new Android "raw GNSS" API? https://developer.android.com/develop/sensors-and-location/s...
I believe Google are using that themselves for their "urban canyon" GPS improvements: https://android-developers.googleblog.com/2020/12/improving-...
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#18Andreas Spiess, the youtuber with a swiss accent, recently did a video on GNSS w/ RTK. https://www.youtube.com/watch?v=Oc1LBFDj2MA
Goes into detail about how to setup your own, join existing networks, even using fairly inexpensive tooling for your own RTK adventures.
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#19Andreas Spiess, the youtuber with a swiss accent, recently did a video on GNSS w/ RTK. https://www.youtube.com/watch?v=Oc1LBFDj2MA Goes into detail about how to setup your own, join existing networks, even using fairly inexpensive tooling for your own RTK adventures.
Sparkfun also has an interesting writeup on how you could set up a base station and feed into networks as well https://docs.sparkfun.com/SparkFun_RTK_Firmware/permanent_ba...
Re: Swipos-GIS/GEO, nationwide GNSS RTK correction for centimeter accurate location
#20Earlier quoted context omitted.
> It's a bit of shame that the pricing seems to be rather steep for frivolous use The pricing norms for RTK correction networks were set 20 years ago, when operating your own base station meant buying a second $20,000 dual frequency receiver, and taking an extra guy any time you go out to do a survey, whose job is just to guard the base station. This made a $2000 a year network correction service seem like great valu…
This should be another crowdsourced sensor fabric network, like air quality sensors, AIS, ADS-B, distributed SDR, etc.