| 摘要 |
A freight tracking system having sufficient accuracy for most commercial freight hauling purposes is disclosed. The system includes a mobile telephone transmitter located in the freight or in the vehicle hauling the freight that automatically calls a telephone at the central reporting station. A caller reception unit detects the calling number and current visited base station information without answering the call and supplies it to a computer at the central reporting station which then determines the location of the shipment. |
