[0]"The sensors are basically a bearing antenna with a very accurate clock and a computer. A lightning discharge has a "signature" that allows the sensor's software to distinguish lightning discharges from all the other electrical noise in the world."

[0] - https://hjelp.yr.no/hc/en-us/articles/9260735234076-Lightnin...

I wonder how they get the bearing from one sensor? An array of antennas perhaps?