| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep high reliability by surely forming a transmission path over a wide area even when a terminal station moves. SOLUTION: A signal sent from a transmission station is received by other slave station 2 within a transfer area. Each slave station 2 receives sensor information, transmission station position information and sensor position information almost simultaneously in parallel to calculate a delay time. The delay processing of the slave station 2 closet to a master station 1 is first finished, and since there is not other station making transmission at this point of time, a carrier signal is used to start transmission of a succeeding signal. The transmission station in standby in the reception state for a prescribed time after the transmission receives the first carrier signal and confirms the normal transmission state to the slave station 2. Then another slave stations 2 start checking the state of another station sequentially as the delay time elapses, and since the first slave station 2 acts like a new transmission station already and sends the carrier signal at this point of time, the following slave station 2 are in standby in the reception state.</p> |
