Description: Spectrum analyzer is an essential signal processing research tool. Existing analysis can effectively smooth linear signal spectrum analyzer based fast Fourier transform, but it is difficult to analyze the nonlinear and non-stationary signal instantaneous frequency energy changes. To solve this problem, we design a spectrum analyzer based on Hilbert Huang Transform, able to carry out effective analysis of non-stationary signals. The design of the system to DE2-FPGA development board as the hardware platform, combined with the soft-core processor NiosII be achieved, the external signal acquisition can be Hilbert Huang transform, time signal- Frequency- dimensional energy spectrum, and can be displayed in real time on the VGA. System test results show that the design spectrum analyzer nonlinear non-stationary signals have very good results, consistent with the Matlab results, effectively compensate for the shortcomings of traditional signal analyzers.
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