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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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