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Optimal Modulation Method of Binary Coded Symbol Based on Minimum Frequency Shift Keying Pulse

A binary code, frequency shift keying technology, applied in the field of satellite navigation, can solve the problems of miscapture, slow attenuation, and inability to accurately lock the main peak, etc., and achieve good autocorrelation effect

Active Publication Date: 2015-11-11
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, Wei Liuetal proposed the minimum frequency in "MSK-BinaryCodedSymbolmodulationsforglobalnavigationsatellitesystems" (the minimum frequency shift keying binary coded symbol modulation of the global satellite navigation system) / / IEICE ElectronicsExpress, Vol.7, No.6, MAR252010, pp.421-427 The shift keying binary code symbol modulation method has good code tracking performance, anti-interference and anti-multipath capabilities, and the navigation signal has a constant envelope so that the high power amplifier can work in a saturated or near-saturated state to improve the power amplifier. efficiency, but the binary coded symbol (MSK-BinaryCodedSymbols, MSK-BCS) sequence under the minimum frequency shift keying pulse modulation given in the above literature presents the characteristics that the sidelobe peak of the autocorrelation function is very close to the main peak and decays slowly, so It will make the receiver unable to accurately lock on the correct main peak when the signal is captured and tracked, resulting in miscapture or mistracking

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  • Optimal Modulation Method of Binary Coded Symbol Based on Minimum Frequency Shift Keying Pulse
  • Optimal Modulation Method of Binary Coded Symbol Based on Minimum Frequency Shift Keying Pulse
  • Optimal Modulation Method of Binary Coded Symbol Based on Minimum Frequency Shift Keying Pulse

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Embodiment 1

[0038] This example first gives an improved binary coded symbol modulation method based on minimum frequency shift keying pulse

[0039] The generation process of MSK-BCS ([1, 1, 1, 1, -1, -1, 1, -1, 1, -1], 1), and then derivation directly affects the code tracking accuracy, threshold and Gabor bandwidth, and The power spectral density of signal spectrum separation, anti-interference and anti-multipath performance, and finally perform performance evaluation. The specific steps are as follows:

[0040] Step 1: Solve the MSK pulse power spectral density. The specific solution process is:

[0041] The MSK signal is: Where: P is the carrier power, f cc is the carrier center frequency, φ n (t) is the carrier phase, φ 0 is a constant phase offset.

[0042] Let the modulating signal be: where: c k is the PRN code, T c is the period of the PRN code, p(t) is the pulse waveform, the length of the pulse waveform sequence is n, and the expression of the pulse waveform is: ...

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Abstract

The invention discloses an improved binary coded symbol (BCS) modulation method based on a minimum shift keying (MSK) pulse. On the basis of BCSs, spread spectrum symbols are split into n units, a symbol pulse waveform of MSK is adopted in each unit to replace a binary value waveform, and an optimized BCS sequence is finally obtained for modulation. According to the method, by optimizing the BCS sequence with good self-correlation performance, the BCSs can be good in self-correlation characteristic, good in anti-interference performance, good in anti-multipath performance and high in compatibility, and the characteristics of constant envelope, improved power amplification efficiency, high side lobe attenuation and the like of MSK modulation can be achieved.

Description

technical field [0001] The present invention relates to a method in the technical field of satellite navigation, in particular to a binary code symbol ( BinaryCodedSymbols, BCS) to optimize the modulation method. Background technique [0002] The satellite navigation signal system is a key link in the top-level design of the navigation system, and its performance directly determines the navigation positioning, compatibility and interoperability of the system. Among the main parameters of the navigation signal system, the modulation waveform determines the power spectrum envelope of the navigation signal, and the power spectrum envelope shows the global characteristics of the signal power spectrum, which directly affects the code tracking accuracy, threshold and Gabor bandwidth, and the signal Spectrum separation, anti-interference and anti-multipath performance. Therefore, designing efficient signal modulation techniques is an important research topic. [0003] In the pri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/01
CPCG01S19/21G01S19/22
Inventor 战兴群刘美红陈懋霖李伟
Owner SHANGHAI JIAOTONG UNIV