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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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