CAJ | 학술논문

根据软件无线电理论设计了一种应用于逆合成孔径雷达成像系统的数字化中频接收机，提出了一种可变抽取因子的数字下变频方案，可以大大提高接收机系统的灵活性。该数字化中频接收机最终在Xilinx Virtex?6 FPGA上实现，可保证在不发生频谱混叠的情况下将中心频率为105 MHz，带宽0~20 MHz之间可变的中频信号下变频为低数据率的数字零中频信号。系统提供2~84之间共14种不同的抽取因子，可以根据输入信号带宽进行配置。测试结果表明，该系统设计正确且无虚假动态范围大于90 dB。
근거연건무선전이론설계료일충응용우역합성공경뢰체성상계통적수자화중빈접수궤，제출료일충가변추취인자적수자하변빈방안，가이대대제고접수궤계통적령활성。해수자화중빈접수궤최종재Xilinx Virtex?6 FPGA상실현，가보증재불발생빈보혼첩적정황하장중심빈솔위105 MHz，대관0~20 MHz지간가변적중빈신호하변빈위저수거솔적수자령중빈신호。계통제공2~84지간공14충불동적추취인자，가이근거수입신호대관진행배치。측시결과표명，해계통설계정학차무허가동태범위대우90 dB。
A digital intermediate frequency receiver applied to inverse synthetic aperture radar(ISAR)imaging system was designed according to software defined radio theory. The digital down conversion scheme of variable extraction factor is proposed to improve the flexibility of the receiver system. The digital intermediate frequency receiver is realized on Xilinx Virtex?6 FPGA, which can convert the variable intermediate frequency signal whose center frequency is 105 MHz and bandwidth ranges from 0~20 MHz into digital zero intermediate frequency signal of low data rate in the condition of without spectrum aliasing. The system provides 14 different extraction factors among 2~84,which can be configured according to the bandwidth of input signal. The test results show that the system design is correct,and the spurious?free dynamic range is bettter than 90 dB.