My old timer story: I worked for TRW Space Electronics Group a long time ago. TRW Automotive was a distant division. They wanted a high tech gadget for tractors

My old timer story: I worked for TRW Space Electronics Group a long time ago. TRW Automotive was a distant division. They wanted a high tech gadget for tractors. So they came to my department. They needed a true ground speed sensor because the amount of tire slip has a huge impact on fuel economy when plowing fields, and manually controlling throttle to achieve optimal slip isn't reliable. We developed a gadget that used doppler radar and some digital signal processing. Output signal fed into throttle control. Seemed amazingly high tech for tractors at the time which was more than 20 years ago.