基于FPGA的导航抗干扰接收机数字变频的实现  

Implementation of DDC and DUC in Satellite Navigation Receivers with Anti-jamming Ability Based on FPGA

作　　者：李滢昕 陈建春[1] 徐飞[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《电子科技》2014年第10期129-132,共4页Electronic Science and Technology

摘　　要：根据卫星信号结构、频率特征设计和实现了导航抗干扰接收系统中,基于软件无线电的上下变频模块。根据系统的A/D采样频率与转换位数、阻带衰减要求、频率选择性、增益,输入输出频率在Matlab中建模。确定了DDC和DUC的设计方案,并在硬件上实现,重点是NCO和滤波器组设计,包括梳状滤波器、半带滤波器和补偿滤波器。构建完成系统后进行了仿真验证,可满足系统设计要求。DDC and DUC are designed and implemented based on software radio in the satellite navigation receiving system with anti-jamming ability according to the structure of the satellite signal and the frequency characteristic. Models are established in Matlab for simulation according to the A /D sampling frequency and convert digits of the system and stop-band attenuation,frequency selectivity,gain,input and output frequency. Then the design scheme of DDC and DUC is determined and implemented on the hardware,with focus on the NCO and filter bank design,including CIC,the HB filter and the compensation filter. The simulation verifies that the requirements of system design are met.

关 键 词：数字变频 数控振荡器 梳状滤波器 半带滤波器 补偿滤波器 

分 类 号：TN919.4[电子电信—通信与信息系统]