Estimation Method of Subtle Baud Rate Characteristics Based on Progressive Precision Timing Estimation
A subtle feature and timing estimation technology, which is applied in digital transmission systems, data exchange networks, electrical components, etc., can solve the problem of difficult identification of subtle features of radiation sources, and achieve the effects of reducing calculation load, improving real-time performance, and high estimation accuracy
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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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