| 摘要 |
An automated theft alarm system integrated into a vehicle for use with a two-way paging system and a vehicle location system is described. The possible theft or break-in of a vehicle is detected by a system integrated within the vehicle which then transmits a two-way paging signal to a two-way paging base station. The base station then transmits an alert to the vehicle owner using an existing paging infrastructure and the vehicle owner is then given the opportunity to determine if an actual theft or break-in is underway. If an actual emergency situation exists, the vehicle owner uses the two-way paging device to transmit an actual theft alarm to an authority such as the police which also can automatically invoke a vehicle location system at the two-way paging base stations. The network of two-way paging base stations then use interferometric direction finding and triangulation on the two-way paging back link signal to locate the vehicle. The vehicle is instructed to continuously transmit signals which allow the two-way paging system to accurately monitor the location of the stolen vehicle. The two-way paging back link signal is in the form of a low power, frequency hopped spread spectrum signal. The system may also be used to remotely monitor the condition of the vehicle and remotely control selected functions within a vehicle. |
