Baud rate subtle feature estimation method based on precision progressive timing estimation
A technology of timing estimation and subtle features, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problem of difficult identification of subtle features of radiation sources
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Embodiment 1
[0039] Embodiment one, see figure 1 As shown, a baud rate subtle feature estimation method based on precision progressive timing estimation includes the following steps:
[0040] Step 1. Collect the estimated signal s of length L r (n), perform a modulo operation on it to get |s r (n)|;
[0041] Step 2, to|s r (n)|Perform DFT rough estimation to get the symbol rate R B estimated value of determine the estimated value margin of error;
[0042] Step 3. Based on estimated value The margin of error for |s r (n) | Perform CZT refinement spectrum analysis, select the CZT refinement interval, calculate the refinement interval, estimate the amount of matching data, perform CZT calculation, and update the symbol rate estimate
[0043] Step 4. According to the estimated value Select data starting point M 1 , the corresponding timing time is obtained by the best sampling time estimation
[0044] Step 5. According to the estimated value The error range selects M 2 , t...
Embodiment 2
[0049] Embodiment two, see figure 1 As shown, a baud rate subtle feature estimation method based on precision progressive timing estimation includes the following content:
[0050] Step 1. Collect the estimated signal s of length L r (n), perform a modulo operation on it to get |s r (n)| to convert it to a unipolar baseband pulse train.
[0051] Step 2, to|s r (n)|Perform DFT rough estimation to obtain the corresponding estimated error range, which specifically includes the following content: set the signal s r (t) According to the sampling rate f s Discretize to s r (n), the number of DFT operation points is N, and the symbol rate can be measured from the prominent discrete spectral line single-frequency component of the symbol rate position, and the symbol rate R B estimated value of Obtained by the calculation formula, the calculation formula is:
[0052] Among them, S r0 (ω)=P(|s r (t)|), S r0 (ω) is the pair s r (t) The power spectrum calculated after the m...
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