一种基于FPGA的中频数字接收机设计  

Design of a FPGA-based Digital IF Receiver

作　　者：徐海源[1] 李强[1] 周一宇[1] 卢启中[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《现代雷达》2006年第11期81-83,86,共4页Modern Radar

摘　　要：提出了一种基于FPGA的中频数字接收机的设计方案。该方案首先采用FFT检测频率峰值,然后进行带通滤波、正交变换。对正交变换后的信号用CORD IC算法计算瞬时相位,然后利用相位差分方法对频率进一步精确估计。文中详细描述了设计思路和各模块的FPGA实现方法,并进行了硬件仿真。仿真结果表明,该方案具有实时性强、脉冲参数测量精度高的优点。In this paper, a new FPGA-based method of designing digital IF receiver is proposed. In this method, the peak of frequency is first detected by FFT algorithm, then a band-pass filtering and a quadrature transform are done. After this, the instantaneous phase of the transformed signal is calculated by CORDIC algorithm. Finally the frequency is estimated in a more precise way by the phase differential method. The outline of the design and its realization in FPGA are described in detail. Hardware simulation results show that the method has advantages of real-time performance and precision in pulse parameter measurement.

关 键 词：可编程门阵列 I-Q变换 CORDIC算法 

分 类 号：TN858[电子电信—信息与通信工程]