Terrain positioned tracking means and guidance sensor therefor

Abstract From the Canadian patent

Zvi LIVNEH, ABSTRACT, In a particular species of the preferred embodiment the, invention contemplates a land traveller such as a farm tractor pulling a passive load such as a plough disc or the like, and, means for directing control of the path of travel of the same over a field, and also for regulating or controlling the depth of penetration of the plough or disc means into the surface of the ground according to a predetermined irrespective of the terrain profile. The path control means consists of locating in a predetermined way, a track whose position is sensed by sensing means, preferably an electromagnet and the relative, position of the magnet is sensed by appropriate means such as …