An improved flat-top self-convolution window weighted power harmonic amplitude estimation method
A power harmonic, self-winding technology, applied in computing, electrical digital data processing, instruments, etc., can solve the requirements of weak signal detection, low harmonic amplitude measurement accuracy, poor weak signal parameter estimation ability, etc. problem, to achieve the effect of reducing the fence effect error, fast sidelobe decay rate, easy to achieve
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[0042] The invention as Figure 1-4 shown, including the following steps:
[0043] step 1):
[0044] Using an analog-to-digital converter at a fixed sampling frequency f s Sampling the grid signal to obtain sampled data x(n);
[0045] Step 2):
[0046] Construct an improved FDMS-4FT self-convolution window function f with length N pp (n), weighting the sampled data x(n) to obtain a long sequence of N points x N (n);
[0047] Step 3):
[0048] pair sequence x N (n) Perform fast Fourier transform operation to obtain frequency domain spectral line, and then calculate the modulus of the spectral line to obtain the fundamental wave and the amplitude of each harmonic of the signal.
[0049] The method of constructing the improved FDMS-4FT self-convolution window in step 2) is as follows:
[0050] First, optimize the FDMS-4FT window coefficients. Assuming a P-order FDMS-4FT convolution window f pp (n) has length N PP . due to N PP >>P≥1, the length of the parent window ...
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