CAJ | 학술논문

更大的带宽是数字射频存储(DRFM)系统的发展方向，获取超宽带微波器件、高速AD/DA、高速存储/信号处理芯片等关键器件成为制约DRFM系统发展的瓶颈问题。该文提出了一种多通道频率交织架构，构建了一套C波段的超宽带DRFM系统。并针对系统复杂度增加带来的信号失真问题，在FPGA上设计并实现了补偿算法。实验结果表明：系统瞬时带宽达到f0±700 MHz、带内幅度平坦度优于6 dB、信号线性度优于5×10?5。从而实现利用通用器件构建超大带宽DRFM系统的目的。
경대적대관시수자사빈존저(DRFM)계통적발전방향，획취초관대미파기건、고속AD/DA、고속존저/신호처리심편등관건기건성위제약DRFM계통발전적병경문제。해문제출료일충다통도빈솔교직가구，구건료일투C파단적초관대DRFM계통。병침대계통복잡도증가대래적신호실진문제，재FPGA상설계병실현료보상산법。실험결과표명：계통순시대관체도f0±700 MHz、대내폭도평탄도우우6 dB、신호선성도우우5×10?5。종이실현이용통용기건구건초대대관DRFM계통적목적。
Large broadband is an important goal of the digital radio frequency memory (DRFM) system, but a bottleneck problem is how to obtain wideband RF microwave devices, high speed AD/DA, memory and signal process chip economically and efficiently. To avoid this problem, a novel DRFM system based on multi-channel frequency interleaved method has been developed. The design of the digital correlation algorithm can overcome the shortcomings of this system on reconstruction accuracy, such as the channel amplitude and phase distortion, the difference of delay between channels, and the non-ideal effect of sharp bandpass filters. Test experiments certify that the system can reconstruct the broadband signalf0±700 MHz with the flatness less than 6 dB and the linearity less than 5×10?5.