| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a data reproduction device for a pulse compression radar of a real system for performing digitally IQ separation after A/D conversion, not using a digital filter for IQ separation, capable of miniaturizing and lightening a circuit, and reducing sampling speed corresponding to the band width of an object signal. <P>SOLUTION: A received signal subjected to frequency conversion by a receiver 2 is subjected to A/D conversion by an A/D converter 32, separated digitally into an I-signal and a Q-signal by a digital IQ separation circuit 33, then thinned out to 1/n (n: an integer) corresponding to the band width by thinning-out processing circuit 34. Then, zero padding having the meaning of no data is performed in a thinned-out data part and in a vacant data part generated by shifting the I-signal and the Q-signal alternately in time by a zero padding processing circuit 41, to thereby remove overlapping between the signal and a virtual image signal. Thereafter, after conversion into data on a frequency axis by an FFT 42, only a signal component from which the virtual image signal is removed by correlative processing using a reference function by a correlative processing circuit 43 is subjected to pulse compression, and returned to data on the time base by a reverse FFT 44. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
