| 摘要 |
The invention provides a warning device which includes a GPS unit (28), which generates a navigation data stream, a GSM module (34), an RF transceiver (34) for communication, via at least one radio frequency band, with other warning devices when the warning device is used in a system, and a microcontroller (24) which receives the navigation data stream, forwards the data stream as a request to the GSM module for transmission over a GSM network and receives therefrom a response, and from the navigational data stream and the response is enabled to generate a positional data stream containing, at least, information on position, speed and direction of travel and nearest physical address of a vehicle to which the device is engaged, which positional data stream is then transmitted by the RF transceiver on the at least one radio frequency band. |
