MATERIAL HANDLING SYSTEMS WITH HIGH FREQUENCY RADIO LOCATIONDEVICES

A material handling system uses high-frequency location devices, such as ult ra- wideband (UWB) devices, for determining the location of mobile units, such a s AGVs, overhead mono-rails, conveyor components, or individual articles being transported by such units. The high-frequency location devices may also be used to identify the contents and/or routing information for material being moved within a facility. AGVs may incorporate the high-frequency location devices into their navigation systems to utilize the position and/or heading updates provided by the location devices in guiding the vehicle. The locatio n devices work in cooperation with a number of stationary location devices, su ch as beacons, that are positioned within the environment at known locations, such as in or adjacent the ceiling of the workplace environment. High- frequency radars may also be used to provide electronic bumpers to the AGVs, allowing them to sense obstacles and take appropriate action to avoid collisions with the obstacles.