| 摘要 |
PROBLEM TO BE SOLVED: To remove defection such as time loss in adjusting and setting of a standard value when there is no trains and in seasonal readjustment, caused by differences in physical conditions owing to structure of railroad at every location and changes in propagation loss owing to changing weather, when locating a train detection device to detect whether with or without a train, defining the railroad between a leak co-axial cable 51 and 53 at both outside of a railroad track as a space transmission line. SOLUTION: Transmitting output of a transmitter 3 is branched off into two, and one is input to a compositor 8 as a receiving signal through sending/ receiving cables 51 and 53 of a detection loop 5, and the other is input to the compositor 8 as a standard signal to composite vector with the receiving signal through a vector adjustment unit 7. A receiving control unit 9 is constituted to adjust amplitude and phase of the standard signal and set an initial standard value in order to offset the standard signal to be input to the compositor 8 and the receiving signal in a negative phase and to automatically adjust, update and set the value at every season.
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