基于FPGA的全相位FFT高精度相位测量  

High-precision phase detection with apFFT based on FPGA

作　　者：沈艳芳[1] 陈丽花[1] 陈星[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电子测量技术》2011年第8期52-55,共4页Electronic Measurement Technology

摘　　要：传统的FFT测相方法,若不采取一些繁复的补偿和修正措施,只有在满足信号频率为频率分辨率整数倍的条件下才有意义,而这个制约条件在实际工程应用中往往难以满足。基于全相位FFT(apFFT)的思想,结合实际工程应用要求,设计并在FPGA平台上实现了1种高精度相位检测系统。在MATLAB环境下的功能模拟和性能仿真,以及在FPGA平台上的实际测试结果表明,该精密测相系统突破制约条件,实际测相绝对精度优于5×10-3(°),具有很高的实际工程应用价值。Traditional FFT based phase detection methods are applicable only when the signal frequency is an integer multiple of the signal resolution.In practice,complicated compensation and correction must be taken to overcome this constraint.To address the difficulty,a novel high-precision phase detection method is proposed utilizing the idea of all phase FFT,and corresponding practical system is realized based on FPGA.Functional simulation and evaluation using MATLAB and FPGA platform has demonstrated the successful application of the presented method without any constraint on the signal frequency.With phase detection accuracy of 5×10-3（°）,the method could be a highly favorable approach in practical engineering.

关 键 词：全相位FFT 高精度相位测量 FPGA CORDIC算法 

分 类 号：TN914[电子电信—通信与信息系统]