This was a weird one…
About halfway through the flight the number of satellites seen by the sonde started dropping. When it got to 6, it started giving timestamp errors. It then started sending out invalid GPS coordinates.
You can view the flight path and sensor data for RS41-SGP R5020799 on the SondeHub tracker! https://sondehub.org/R5020799
As you can see, it was reporting to be flying at 40m altitude in Belarus for some time. This data was reported by multiple receivers and also affected another sonde T0340269 which reported this identical path….
What would cause this? GPS spoofing by satellite? I’m very curious.
The sonde itself I located after it started picking up more satellites again and corrected the location for the rest of the flight. The meteo telemetry was correct for the whole flight.
Let me know in the comments, have you got any theories?
Hi!
Can you please send here better pictures of radiosonde. Electronics too.
In Poland with radiosonde from Legionowo we have this same situation in that same time. Coordinates are near identical with Poprad. But not this same.
Hi, I’m under the impression that it was as case of gps spoofing so I reported it to the USCG Navigation Center.
Some more details and logs here :
https://github.com/dl9rdz/rdz_ttgo_sonde/discussions/204