| 摘要 |
<p>PURPOSE:To simplify the circuit constitution of a receiver and to attain the inexpensive equipment by shifting in advance a transmission frequency of a transmitter by a frequency corresponding to an estimated Doppler shift of a communication wave. CONSTITUTION:A data inputted from a data input terminal 1 is converted into a radio modulation signal by a modulator 2. On the other hand, Doppler information obtained from an object tracing radar or the like from a Doppler information input terminal 9 is inputted to a frequency shift quantity control circuit 8. The synthesized frequency to be shifted is mixed with a radio modulation signal from the modulator 2 by a mixer 3 and converted into a high frequency signal. The Doppler shift is cancelled in the receiver. Thus, it is possible to process the communication wave from the high speed mobile body with high accuracy while employing the conventional constitution for the receiver.</p> |
