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Correlation fluctuation based BOC (binary offset carrier) signal parameter blind estimation method

A signal parameter and autocorrelation estimation technology, applied in radio wave measurement system, satellite radio beacon positioning system, measurement device, etc., can solve the problems of complex calculation and low signal-to-noise ratio of spectral correlation method, and overcome nonlinear calculation Complexity, effect of improving noise immunity performance

Active Publication Date: 2014-12-10
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to propose a method for correlating fluctuations to solve the difficult problem of BOC signal pseudo-code period and subcarrier rate estimation in view of the shortcomings of the prior art in estimating the pseudo-code period of the signal, such as a large amount of calculation. It overcomes the problem of complex calculation of the spectral correlation method, and at the same time uses the cumulative average of multiple groups of signals to reduce the impact of noise on the pseudo-code period and subcarrier rate estimation, thereby enabling the correlation fluctuation method to be completed at a lower signal-to-noise ratio Blind Estimation of Pseudocode Period and Subcarrier Rate of BOC Signal

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  • Correlation fluctuation based BOC (binary offset carrier) signal parameter blind estimation method
  • Correlation fluctuation based BOC (binary offset carrier) signal parameter blind estimation method
  • Correlation fluctuation based BOC (binary offset carrier) signal parameter blind estimation method

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[0017] The implementation of the present invention will be specifically described below in conjunction with the accompanying drawings and specific examples.

[0018] figure 1 Shown is the waveform diagram of baseband BOC signal generation. The baseband BOC signal can be obtained by multiplying the information code modulated by the pseudocode with the subcarrier.

[0019] figure 2 Shown is the flow chart of the method for estimating pseudo-code period and subcarrier rate of the present invention, comprising the steps of: pressing the same time length (comprising two or more information code lengths in the time length) to the received signal; selecting a larger The autocorrelation integration time L (generally preferably one to three times the length of the information code time) is used to perform autocorrelation second-order moment calculations for each segment of the signal; to accumulate and average the autocorrelation second-order moments obtained each time; The autocor...

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Abstract

The invention relates to a correlation fluctuation based BOC (binary offset carrier) signal pseudo code period and subcarrier rate blind estimation processing method, in particular to a correlation fluctuation based BOC (binary offset carrier) signal parameter blind estimation method, and belongs to the technical field of signal processing. According to the method, multiple parameters of a BOC signal can be estimated under the conditions of different correlation integral time delays through a fluctuation correlation method; when a ratio among the correlation integral time delays is large, pseudo code period of the signal can be estimated; when the ratio among the correlation integral time delay is small, subcarrier rate parameters of the BOC signal can be estimated. The method is high in rate of convergence and good in estimation accuracy, and the problems of complexity in nonlinear operation of a spectral correlation method and incapability of pseudo code period estimation are solved. By the method, the pseudo code period, namely subcarrier rate can be estimated accurately under the condition of low signal to noise ratio, so that the method has significance to subsequent processing and fine feature analysis of the signal.

Description

technical field [0001] The invention relates to navigation communication signal processing, in particular to a problem of blind estimation of pseudocode period and subcarrier rate of binary offset carrier modulation (Binary-Offset-Carrier, BOC) signal based on correlation fluctuation. Background technique [0002] With the popularization and development of satellite navigation technology, BOC modulation technology is widely used in the new generation of satellite navigation systems, such as the latest generation of Galileo and GPS navigation systems and my country's Beidou satellite navigation system. According to the latest Galileo space signal interface control document, 8 out of 10 Galileo navigation signals use BOC modulation or improved BOC modulation. Similar to the design of the Galileo system, the newly added M-code military signal in the GPS navigation system of the United States also adopts the BOC modulation method. The military signal and the civilian signal are ...

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Application Information

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IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 张天骐阳锐张刚高超徐昕
Owner CHONGQING UNIV OF POSTS & TELECOMM
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