| 摘要 |
PROBLEM TO BE SOLVED: To prevent erroneous detection of a sensor device even if at least a part of a transmitting leakage transmission line of one intrusion object detection system and at least a part of a transmitting leakage transmission line of the other intrusion object detection system are installed in proximity.SOLUTION: The intrusion detection system includes a first sensor device 21a having a first transmission circuit part 18a transmitting the modulated wave of first transmitting spectrum diffusion signals to a first transmitting leakage transmission line 14a, and a second sensor device 21b having a second transmission circuit part 18b transmitting the modulated wave of second transmitting spectrum diffusion signals to a second transmitting leakage transmission line 14b. The signal intervals of the first transmitting spectrum diffusion signals and the signal intervals of the second transmitting spectrum diffusion signals are the same, and the first transmitting spectrum diffusion signals and the second transmitting spectrum diffusion signals are shifted in frequency so that the first transmitting spectrum diffusion signals and the second transmitting spectrum diffusion signals do not overlap. |
