| 摘要 |
<p>PURPOSE:To enable the judgement of collision possibility by one antenna scanning, by detecting the change in Doppler deviation during a time when a flight object passes through the beam covering region of an antenna. CONSTITUTION:The signal with frequency f0 generated by an RF oscillator 1 is amplified to a predetermined level by an RF power amplifier 2 to be emitted to the space from a transmission antenna 3 and reflected from a remote high speed flight object and returned while the reflected wave is received by a receiving antenna 4. At this time, the reflected wave receives Doppler deviation fd by the speed component of a straightly advancing object in the antenna direction and received at frequency f0+fd. Therefore, if this receiving signal receives the amplification of low noise by an RF amplifier 5 and mixed with a part of the output of the oscillator 1 by a mixer 6, Doppler deviation fd can be extracted. When this deviation fd is guided to a phase detector 8, phase information of phi out is obtained at the output terminal thereof. As a result, when judge deviation fd is positive by a judge circuit 11, proper avoiding operation is taken.</p> |
