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

Inactive Publication Date: 2016-11-09
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0009] In order to overcome the deficiencies in the prior art, the present invention provides a baud rate subtle feature estimation method based on precision progressive timing estimation, which solves the problem that the subtle features of the radiation source are difficult to identify, and provides a reliable basis for the identification of the radiation source

Method used

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  • Baud rate subtle feature estimation method based on precision progressive timing estimation
  • Baud rate subtle feature estimation method based on precision progressive timing estimation
  • Baud rate subtle feature estimation method based on precision progressive timing estimation

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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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Abstract

The invention relates to a Baud rate subtle feature estimation method based on precision progressive timing estimation. According to the method, transformation is carried out on a to-be-estimated signal, DFT coarse estimation is carried out, and an estimation error is obtained; spectrum zooming analysis is carried out by employing a CZT method, a relatively high-precision signal Baud rate is obtained, and Baud rate estimation of precision progressive timing is carried out, so that the higher estimation precision is obtained, an estimation value satisfies a preset precision demand, and the subtle features of different radiation sources can be distinguished. According to the method, the problem that in the prior art, the estimation precision of the subtle features of the radiation sources is low is solved; the higher estimation precision is obtained through the Baud rate estimation of precision progressive timing estimation; the precision is enough to distinguish the subtle features of the different radiation sources; and the reliable basis is provided for radiation source identification.

Description

technical field [0001] The invention belongs to the technical field of subtle features of radiation sources, in particular to a method for estimating subtle features of baud rates based on precision progressive timing estimation. Background technique [0002] Estimating the subtle features of radiation sources refers to the technology of obtaining the working status of radiation sources and distinguishing different radiation sources through precise calculation of signal parameters. For the satellite communication signal received by the ground station, the signal has gone through two links: the ground transmission equipment and the satellite transparent forwarding. It is assumed that the sampling clock and local oscillator of the ground receiving equipment for subtle feature analysis and processing all have high precision and stability, which is at least two orders of magnitude higher than that of the equipment in the communication link. Therefore, the ground receiving equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26
CPCH04L43/0894
Inventor 李天昀王大海巩克现许漫坤彭华范磊杜健董政
Owner THE PLA INFORMATION ENG UNIV
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