Posted 1/7/2018 18:31 (#6487237 - in reply to #6485323) Subject: RE: Inside a Trimble AutoSense (Pics)
tedbear - 1/7/2018 04:50
Interesting. Looks well built internally. Too bad, the connector stub to the outside world wasn't more durable. Whenever I had problems, it was always the stub cable.
The unit worked well but I still don't understand how it worked. I realize that a gyro resists change which could be measured but I don't understand how the system "knows" which way my tractor wheels are pointing when it is first started after sitting.
+1 on the connector/cable.
Autosense MUST be used with a GPS-based guidance system, because Autosense itself has no clue (and doesn't care) about heading. It is only measuring amount of change in heading, and (I think) rate of change in heading. In other words, it's providing a relative heading (the heading has changed D degrees at R rate since the last measurements) rather than an absolute heading.
In addition to the gyro Lance described, I think there is also an accelerometer, although maybe Trimble uses more PFM to calculate rate of change from multiple filtered gyro measurements.
Autosense can't be used with feeler systems, or laser systems, or optical systems, unless there is also a GPS receiver present to provide heading info to the system.