I was trying to learn more about the problem as two of my colleagues were victims of relay attacks, allegedly. Stolen cars were Mazda and Kia. I found claims that only Jaguars and Land Rovers have been resistant to that kind of attack thanks to precise time measurement - similar solution to your description.

I don't have any links and found only [1] this one quickly.

[1] https://teamtalk.jaguarlandrover.com/news/jaguar-land-rover-...