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A Slope Bit Synchronization Method for Satellite Navigation Signals

A satellite navigation signal and bit synchronization technology, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as the accuracy rate needs to be improved

Active Publication Date: 2018-04-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the accuracy of this method needs to be improved under the interference of Gaussian noise added to the data

Method used

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  • A Slope Bit Synchronization Method for Satellite Navigation Signals
  • A Slope Bit Synchronization Method for Satellite Navigation Signals
  • A Slope Bit Synchronization Method for Satellite Navigation Signals

Examples

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Embodiment 1

[0049] Refer to attached figure 1 , the slope bit synchronization method of the present embodiment includes the following steps:

[0050] (1) Capture the signal, that is, capture the GPS signal.

[0051] (2) Track the signal, track the GPS signal, and demodulate the navigation message data.

[0052] (3) Calculate the energy value, calculate the energy of each point of the demodulated navigation message data and take the modulus, and accumulate 20 energy values ​​for each position one by one.

[0053] (4) Calculate the bit synchronization, use curve fitting to fit the first 5 points and the last 5 points of a certain position with a straight line, and then find the intersection point of the two straight lines, this point is the bit of bit synchronization.

Embodiment 2

[0055] Refer to attached Figure 2-6 , the slope bit synchronization method of the present embodiment includes the following steps:

[0056] Step 1. Capture the signal:

[0057] To start, read data.

[0058] 11) For the input digital intermediate frequency signal S IF (n) Perform frequency mixing with local replicated sine and cosine carrier signals respectively, and perform Fourier transform on the complex frequency mixing result i+jq.

[0059] 12) The C / A code generator generates the local corresponding C / A code for Fourier transform, and then takes its conjugate value.

[0060] 13) Multiply the result of the above 11) and the result of 12), and perform inverse Fourier transform on the obtained product to obtain the correlation result in the time domain, and detect and analyze these correlation values ​​to determine whether the signal exists.

[0061] 14) After completing the search and detection of the current frequency band, copy the carrier of another frequency value,...

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Abstract

The present invention relates to a slope bit synchronization method for satellite navigation signals. The method comprises the steps of acquiring a GPS signal; tracking the GPS signal and demodulating to obtain navigation message data; calculating the energy of each point in the navigation message data to realize the module acquirement; gradually accumulating the energy value of each position; conducting the straight-line fitting for 5 points before a position and 5 points after the position through the curve fitting process; and figuring out the intersection point of the two straight lines, wherein the intersection point is the bit of the bit synchronization. In this way, the curve fitting is conducted to figure out the slope so as to realize the bit synchronization. Meanwhile, the bit synchronization can be realized by using the slope for not only strong signals but also weak signals. Moreover, the synchronization correct probability of the above slope-based method is higher than that of the histogram-based method. For weaker signals, the bit synchronization can also be realized by using the slope.

Description

[0001] The invention belongs to the field of signal and information processing, and in particular relates to a slope bit synchronization method of satellite navigation signals. Background technique [0002] Bit synchronization technology is an important part of GNSS receiver technology. The correct implementation of bit synchronization is the basis for GNSS receivers to demodulate messages, calculate pseudo-ranges, and use coherent accumulation to achieve high-sensitivity tracking. [0003] The traditional histogram method is a widely used statistical estimation method, which detects the sign changes of the data before and after the output of the statistical correlator or phase-locked loop. Taking GPS as an example, the cycle of output data is 1ms, and there are 20 candidate positions for bit flipping. After a period of statistics, if the sign of one of the candidate positions changes significantly more than other positions, then it is determined that the candidate position is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 刘怡俊叶剑科
Owner GUANGDONG UNIV OF TECH
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