| 摘要 |
PROBLEM TO BE SOLVED: To enable a sensor terminal to transmit sensor data indicating the amount of rainfall, a ground water level, or the like without increasing its transmission power, and to enable measuring displacement at a measurement point where the sensor terminal is installed.SOLUTION: Displacement at a position (x,y,z) where a displacement measurement object sensor terminal 2 is installed is measured using a displacement measurement signal received by base station antennas 3-1 to 3-4. On the other hand, the sensor terminal 2 connected with a sensor that monitors the state of a displacement measurement point constructs a multi-hop network, and transmits sensor data indicating a monitoring result by the sensor to the base station antennas 3 through multi-hop communication. |
