I doubt if the autonomous car is guided by satellites alone. The car probably uses a combination of satellites and stationary towers scattered around the countryside. Tall buildings, trees, bridges etc can mess with satellite signal. When a farm tractor has auto steer it can be guided several ways. One way is the free satellite signal that is moderately accurate, maybe down to 6"-10" stray one way or the other because of satellite drift and atmospheric conditions. Another guidance method is called RTK or Real Time Kinnetics. This involves a combination of satellites and an earth based transmitting tower. The tower doesn't drift so the auto steer computer has one constantly solid point to triangulate on. This puts the steering and repeatable pass accuracy down to sub-inch and it can be remembered by the computer so the tractor can drive down those same tracks next year.
I read where Honda has invested with Chevy on this idea. I had to read it twice, couldn't wrap it around my head a Japanese car company and US car company are joining together in a new venture. Sometimes we don't know what goes on behind closed doors.
One of my tractors has auto steer. Getting used to turning around to look out the back window at the trailing implement while on the go took awhile, especially when the tractor is driving between the rows where steering needs to be accurate. However, I still have a steering wheel in front of me for emergencies and I'm running only 5-8 MPH and I'm not in crazy traffic.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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