关键词: 相位推算法, 全相位FFT, FPGA, Cordic算法

Abstract:

Phase deduction has high frequency measurement accuracy and good instantaneity,but is greatly affected by the SNR.For the conventional frequency measurement method based on FFT algorithm,the accuracy depends on transform points,and the instantaneity gets worse with the increase in points.In this paper,a combination of all phase FFT algorithms with the phase invariant characteristics is proposed,and phase deduction is realized on the FPGA platform.Functional simulation confirms that this method can achieve high precision,strong noise resistance as well as good instantaneity.With these advantages,this method is of value in engineering.

Key words: phase deduction;all phase FFT algorithm;FPGA;Cordic algorithm