| 摘要 |
PURPOSE:To enable the judgement of which moving object passes which fixed point when plural moving objects pass the plural fixed points in a disordery way, by detecting the signals modulated from local oscillation signals and the level of the discriminated signals, and making decision by each of the plural moving objects and by each of plural passage decisions. CONSTITUTION:Mixer circuits 103, 113 and 123 mix the reception signals from hybrid circuits 102, 112 and 122 and the modulated local oscillation signals from modulation circuits 104, 114 and 124 and form the intermediate frequency signals having the differential frequencies between the two signals. The local oscillation signal of a frequency F0 transmitted from a local oscillation circuit 105 is FM- modulated by the circuit 104 with the low frequency oscillation signal from a low frequency circuit 106 oscillating at the frequency differing from either of the other low frequency oscillation circuits 116 and 126 of receivers 110 and 112. The modulated signal and the reception signal transmitted from the circuit 102 by the passage of a moving body 11 or 12 in front of a fixed point A are inputted to the circuit 103. These signals are converted to the intermediate frequency signal having the differential frequency of the two signals in the circuit 103. |
