| 摘要 |
<p>PURPOSE:To hold easily the linearity of a signal waveform and to improve the precision of range information by writing a video signal at the period of a write clock corresponding to a range and reading it by a read clock with a specific period. CONSTITUTION:A radar echo received by an antenna 1 is sent to a receiver 4 through a transmission/reception switching circuit 3 and demodulated as a received video signal. Then, an A/D converting circuit 5 converts it into a digital signal, which is written in a storage device 6. This writing operation is carried out at the clock period obtained by dividing the frequency of the clock outputted from a write clock generating circuit 13 through a program frequency divider 12 which varies frequency division ratio according to ranging. The video signal is read out of the storage device 6 at the constant period of the clock from a read clock generating circuit 15. The read video signal is reconverted by a D/A converting circuit 7 into an analog signal, which is amplified by an amplifier 8 and displayed on a CRT9.</p> |
