Satellite signal subtle feature estimation method based on precision progressive CZT
A satellite signal and subtle feature technology, applied in baseband system components, data rate detection devices, digital transmission systems, etc., can solve the problem of difficult identification of subtle features of radiation sources
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Embodiment 1
[0032] Embodiment one, see figure 1 As shown, a satellite signal subtle feature estimation method based on precision progressive CZT includes the following steps:
[0033] Step 1. Collect the signal s to be estimated with length L r (n), perform a modulo operation on it to get |s r (n) | for s r (n) Perform M power operation to get s r M (n);
[0034] Step 2, respectively for |s r (n)| and s r M (n) Perform DFT rough estimation to obtain the symbol rate R B estimated value of and carrier frequency deviation ω 0 estimated value of And determine the corresponding estimated value error range according to the estimated value;
[0035] Step 3. According to the error range of the estimated value to |s r (n)| and s rM (n) Carry out CZT refinement spectrum analysis, select the CZT refinement interval, calculate the refinement interval K, estimate the amount of matching data, perform CZT calculation, and update the symbol rate R B estimated value of and carrier frequ...
Embodiment 2
[0038] Embodiment two, see figure 1 As shown, a satellite signal subtle feature estimation method based on precision progressive CZT includes the following content:
[0039] Step 1. Collect the estimated signal s of length L r (n), perform a modulo operation on it to get |s r (n) | for s r (n) Perform M power operation to get s r M (n); perform a modulo operation on the estimated signal to convert it into a unipolar baseband pulse sequence; perform an M-th power operation to achieve the effect of demodulating information, and estimate the carrier frequency deviation therefrom.
[0040] Step 2, respectively for |s r (n)| and s r M (n) Perform rough DFT estimation to obtain the corresponding estimated error range, including 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...
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