| 摘要 |
PURPOSE:To detect the position of a moving body at a period P by laying a folded conductor of the period P and a straight conductor along the travelling course of a moving body and digitizing induced voltages of antennas mounted on the moving body at an interval P/3. CONSTITUTION:An inductive radio line 13 consisting of the conductor 11 folded like a wave of the period P and the straight conductor 12 arranged in parallel with the conductor 11 are laid along the travelling course of the moving body and high frequency current is supplied from a transmitter 15 to the conductors 11, 12. The antennas 14-1-14-3 are mounted on the moving body at the interval P/3, the induced voltages of the antennas are straight detected by detectors 22-1-22-3 and their envelope voltages are made 1V1(Z)1, 1V2(Z)1 and 1V3(Z)1 respectively. These voltages are A/D converted by A/D converters 23-1-23-3 and inputted to a computer 24. The computer 24 executes the operation of the formula (A) on the basis of the input signals and displays the position Z of the moving body on a digital display device 25 at the interval of period P. |
