There's a big difference if it's being tracked outdoors or indoors - depending on that you can use different technologies. Another thing is if you can use GPS (

There's a big difference if it's being tracked outdoors or indoors - depending on that you can use different technologies. Another thing is if you can use GPS (no local receivers/sender posts needed) or something like UWB - where you need to deliver coverage for your sensors, does not sound feasible for a NASCAR track. The big players I remember right now are the SMT you mentioned, https://kinexon.com/sports-clients/ https://kinexon.com/sports-clients/ (where I worked) and Zebra.