| 摘要 |
A security system (20) for a portable asset (22), such as a vehicle, includes a user authorization unit (24) and an asset unit (26) mounted on or in the portable asset (22). The user authorization unit (24) includes an authorization signal generator and a transmitter to generate and transmit a signal to the asset unit (26). The transmitted signal identifies the bearer of the authorization unit (24) to the asset unit. When the portable asset (22) is stolen or otherwise moved without first receiving an authorization signal, a transmitter (36) therein transmits a signal identifying the asset unit (26) for example via a standard cellular telephone network. The asset unit (26) also includes a location device which allows the location of the asset (22) to be determined if stolen. <IMAGE> |
