Modulation spectrum fast zoom method based on FFT
A modulation-spectrum, fast technique for fine-grained spectral analysis
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[0026] The solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] combined with figure 1 , attached figure 2 , attached image 3 , the FFT-based fast refinement method of the modulation spectrum includes the following steps: (1) Preliminarily determine the sampling frequency from the analysis frequency range; (2) Set the observation window width to obtain the expected number of sampling data; (3) Group the data to obtain The actual number of sampled data; (4) adjust the sampling frequency so that the observation window corresponds to the analysis frequency range; (5) sample the data and group them for FFT; (6) calculate the initial spectral line and obtain the refined spectrum.
[0028] Step 1. Initially determine the sampling frequency from the analysis frequency range
[0029] For the modulation frequency f z , carrier frequency f c If the signal of the half-bandwidth is taken...
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