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Binary coded symbol (BCS) optimization and modulation method based on minimum shift keying (MSK) pulse

A binary code, frequency shift keying technology, applied in the field of satellite navigation, can solve the problems of slow attenuation, wrong capture, and inability to accurately lock the main peak

Active Publication Date: 2014-03-05
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

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

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  • Binary coded symbol (BCS) optimization and modulation method based on minimum shift keying (MSK) pulse
  • Binary coded symbol (BCS) optimization and modulation method based on minimum shift keying (MSK) pulse
  • Binary coded symbol (BCS) optimization and modulation method based on minimum shift keying (MSK) 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 field of satellite navigation technology, in particular to a minimum shift keying (Minimum Shift Keying, MSK) pulse for Global Navigation Satellite Systems (GNSS) satellite navigation signals Binary coded symbols (Binary Coded Symbols, BCS) optimized 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-multipa...

Claims

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Application Information

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IPC IPC(8): G01S19/01
CPCG01S19/21G01S19/22
Inventor 战兴群刘美红陈懋霖李伟
Owner SHANGHAI JIAO TONG UNIV
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