基于FPGA的某ISAR成像数字中频接收机实现  

Realization of FPGA-based digital intermediate frequency receiver for ISAR imaging

作　　者：张庆祥[1] 尹程[1] 成立涛[1] 

机构地区：[1]哈尔滨工业大学电子工程技术研究所,黑龙江哈尔滨150006

出　　处：《现代电子技术》2015年第23期60-63,共4页Modern Electronics Technique

基　　金：国家自然科学基金重点基金(61032011)

摘　　要：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XilinxVirtex，6FPGA上实现，可保证在不发生频谱混叠的情况下将中心频率为105MHz，带宽0-20MHz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90dB。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.

关 键 词：数字中频接收机 数字下变频 多速率信号处理 抽取因子 

分 类 号：TN957.534[电子电信—信号与信息处理]