A mobile controller unit has a radio positioning system and a two-way communication system and a rover unit also has a radio positioning system and a two-way radio communication system. The controller unit can query the rover unit to send its location data so that the rover unit can be located and if...http://www.google.fr/patents/US20030195008?utm_source=gb-gplus-shareBrevet US20030195008 - Locating system and method
Numéro de demande: 10/421,967 Numéro de publication: US 2003/0195008 A1 Date de dépôt: 23 avr. 2003 Brevet délivré: US7474896 ( Date de délivrance 6 janv. 2009)
