| 摘要 |
PURPOSE:To simplify the constitution of a transmitter-receiver, comparing with a Janus system, by deriving a runnig speed by a Doppler effect from a difference in frequency of two receiving signals which receives one transmitting signal. CONSTITUTION:A transmitter 100 sends out a transmitting signal in the direction being vertical to the main surface of a moving body. Receivers 101, 102 receive the transmitting signal scattered by the running face, and are placed at a position of an equal range from the transmitter, on the main surface of the moving body. Frequency reading means 103, 104 read frequencies of two receiving signals which are received, respectively, and a running speed of the moving body can be derived by a Doppler effect from a difference of two frequencies by an arithmetic circuit 106. |
