Amalgamatedsignal frequency mometer based on TMS320F28335

LI Muyi, LU Huifen, MA Yunlong, LV Wentao
(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: To solve the problems of separating the overlapping signals and conducting the highprecision and highresolution spectrum analysis, the allphase spectrum analysis method was used in the 32bit digital signal processor(DSP). After the study, an approach of dualchannel simultaneous sampling and adaptive sampling frequency was first presented. A composite signal frequency mometer was first designed by combining the excellent signal processing capability and powerful floatingpoint computing power of TMS320F28335 with allphase spectrum analysis method. The system test results show that the frequency mometer’s frequency resolution is as high as 0.4%, and the frequency accuracy level reaches 10-5. The allphase spectrum analysis method has high accuracy and good nature of inhibiting spectrum leakage, and it opens up new space for spectrum analysis.
Key words: digital frequency mometer； digital signal processor(DSP)； allphase spectrum analysis； samplingfrequency selfadaption