| 摘要 |
PROBLEM TO BE SOLVED: To provide a device where the main load of a transmission control processing is placed on a terminal side so as to reduce processing burdens on a sensor side and which measures distribution characteristics by the small number of channels. SOLUTION: A detection condition is reported from a terminal 20 to each sensor 10 and only the sensor satisfying the detection condition as the result of sensing transmits response signals including position information to the terminal. By appropriately setting the detection condition, the number of the sensors which actually transmit the response signals is reduced and communication is made possible by the small number of the channels. The terminal detects a peak sensor position provided with the measured value of a peak from the plural sensors, successively reports the detection condition for which the measured value is reduced stepwise and thus, circulates the sensor positions of the measured value changed stepwise with the peak sensor position as a start point. By performing the circulation for plural times and connecting the extracted sensor positions of the same measured value by a closed curve, a contour map (distribution characteristics) is obtained. |
