| 摘要 |
PROBLEM TO BE SOLVED: To enable one receiver to manage data from transmitters, receiver by receiver, by allowing the receiver to receive carriers from respective transmitters and then distribute and process the received data for every transmitter based on the data for identification. SOLUTION: The respective transmitters 1 send the data individually with radio waves of the same frequency and the receiver 2 receives the carriers from the transmitters 1. The receiver 2 classifies the data from the respective transmitters 1 mixed in the received carriers for every transmitter 1 through a multiplexing decoder 3 provided on the side of the receiver 2, distributes the receive data for every transmitter 1, and checks the data. Tilt sensors 4 are provided on the sides of the transmitters 1 and abnormality of the attitude of a worker who carries a transmitter 1 and works in a common ditch, a tunnel, a building, etc., is detected as an abnormal tilt of the transmitter 1 on the side of the receiver 2 at the remote place according to data from the tilt sensor 4 to specify the worker on the side of the receiver 2 and generates an alarm. |
