A system designed to detect and identify fixed utility objects, such as telephone pedestals, power transformers, man-holes, anchor cables, and the like, that are hidden by heavy overgrowth of vegetation. The system provides for automatic look-ahead detection of such objects during mowing and clearing...http://www.google.fr/patents/US6621417?utm_source=gb-gplus-shareBrevet US6621417 - Passive RFID transponder/reader system and method for hidden obstacle detection and avoidance
Passive RFID transponder/reader system and method for hidden obstacle ...
