| 摘要 |
A container, a transponder, a method and a system are provided that are useful in determining the geographical position of a cargo container. In the event cargo containers are stacked one on top of another, those containers which lack a clear view of a satellite or terrestrial communications tower can transmit container ID information ultrasonically to containers that do have a clear view of a satellite or terrestrial communications tower. The containers having the clear views can transmit container ID information to remote networks using RF communications. The geographical positions of containers can be calculated locally or they can be calculated remotely by sending GPS data or trilateration data to a remote source for position determination.
|
