Patent ID: 7155238
Filing Date: 2006-12-26
Classification: G01S,H04W

Abstract:
1. A communication system for determining geographical location of roaming objects in a vicinity of a plurality of communication devices, comprising: a) a communication network, consisting of at least said plurality of communication devices, said plurality of communication devices configured to communicate with other communication devices over said communication network, and establishing a short range wireless communication with other wireless devices in the vicinity of said plurality of communication devices, said communication network is configured for obtaining the geographical location of said plurality of communication devices and transmitting data representing said geographical location to a destination, over said communication network; b) a wireless tag, attached to each of said roaming objects, being a wireless device, in which a unique data is stored, said tag is configured for communicating with said plurality of communication devices via said short range and transmitting said unique data to said destination through said plurality of communication devices and over said communication network, wherein said tag comprises: c) a control center being linked to said destination, for receiving said unique data from said tag and for using said unique data and the location of the plurality of communication devices, through which said unique data is transmitted, for determining and displaying the geographical location of said tag, wherein the control center communicates with the plurality of communication devices for the presence of tags in their vicinity, according to at least one of the following parameters: a tag's identification; time at which said unique data is transmitted; a geographical region; identification of said plurality of communication devices and a trigger signal generated at the tag or input to the tag.