| 摘要 |
<p>PURPOSE:To easily realize various pulse compression and modulation characteristics by generating a transmit signal and compressing pulses digitally and principally, in a read-only memory with clock signals generated by a common generation source. CONSTITUTION:The digitized signal which is generated by the read-only memory 5 under sequence control 4 is D/A-converted 6, passed through a filter 7 and a mixer 8, and amplified 9 to a specific electric power level, and the signal is led to an antenna through a duplexer 10 and radiated in the air. Then, a radio wave reflected by a target is passed through the antenna and duplexer 10 and amplified 11, and the amplified signal is A/D-converted 13 through a mixer 12 and stored 14. The received signal which is stored 14 is read out with a readout address specifying signal from a readout address specifying circuit while a signal corresponding to the transmit pulse width is shifted by each time corresponding to distance resolution. A correlation signal, on the other hand, is stored in a correlator 15, which multiplies the input received signal by the correlation signal to perform pulse compression.</p> |
