[squarefoot]

> One of the most accurate solution is to keep a GPS receiver on a well known location.

I wonder if a network of connected devices with a GPS-disciplined SDR receiver and a regular GPS one could work both as this project does plus as passive radar like the software that was recently taken down. The purpose would be to have much wider coverage along with redundancy and error correction.

[toomuchtodo]

Such networks exist and make their data public. I think the equivalent you’re looking for is like LightningMaps, where there is real time reporting of observations instead of having to process recorded data to look back in time?

https://geodesy.noaa.gov/CORS_Map/

https://www.e-education.psu.edu/geog862/node/1830

https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss...

[colechristensen]

I worked on something like this in university. GPS bistatic radar. Two SDR frontends with directional antennas pointed in different directions to do various remote sensing, ranging, and other things.

The GPS network is essentially kept up to date with a few ground stations. The ground station is a source of truth that is used to send correction updates to the constellation periodically which are sent to all receivers.