| 摘要 |
PURPOSE:To remove mutual interference of signal and to simplify the circuit construction by generating transmission frequency of 3 frequencies equally with the base signal of a frequency by selectively receiving the reflected signal of upper or lower band of transmission signal. CONSTITUTION:A reference signal generator 1 generates transmission reference signal with IF of the receiver higher than the reference signal f10 and a phase modulator 4 reverses and modulates the phase of 50% duty with modulation frequency of FM. Then, the signal is transmitted through a transmitter 5. Then, 2 kinds of local signals are formed by mixing fIO and fM in a local signal generator 8 and the local signal and reflected signal are frequency-converted 10 by the command of a signal treatment equipment 9. Reflected signal of upper or lower band of transmission signal is selected and received. |
