| 摘要 |
PURPOSE:To detect a Doppler shift with high accuracy by making drift components of the oscillation frequency of crystal that a transmitting and a receiving state have cancel each other. CONSTITUTION:The transmitting station A and receiving station B are provided with modulator demodulators 7. The transmitting station A measures its oscillation frequency actually, modulates a subcarrier by the modulator demodulator with a modulating signal based upon the measured frequency, and transmits the modulated subcarrier to the receiving station B with a radio wave. The receiving station B demodulates the modulated signal of the radio wave by the modulator demodulator 7 to obtain the oscillation frequency and finds the difference between it and the reception frequency of the radio wave by an arithmetic device part 6A to derive a Doppler shift. |
