This is RFI Engineering’s LoRa GPS-less localisation demo. On the map you see the geolocation of a LoRa sensor. The geolocation of the LoRa sensor is calculated from the time difference that the transmitted message from the sensor arrives at each LoRa base station. This method of geolocation is also known as Time Difference of Arrival (TDoA) localisation.
The map shows a live simulation of network coverage and geolocation estimates performed by a network of 50 base stations randomly distributed across the Netherlands. The [!] mark is indicating the location of the sensor. In this simulation the geolocation function is performed by a real ‘solver’ with an automated graphical frontend on top. In fact the solver could take real messages from base stations but we have decided to simulate the sensor messages for the purpose of this demo until there are sufficient ‘live’ LoRa base stations deployed to actually show a live network demo.
Every 10 seconds, a client message is generated and geolocated. Timestamping error is taken to be 500ns