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Multiplexed navigation signal pseudo code extraction method

A navigation signal and multiplexing technology, applied in the field of navigation signal pseudocode extraction, can solve problems such as time-consuming and energy-consuming, volatile tracking loop lock, decoding errors, etc., achieve strong anti-interference ability, save development time, obvious effect

Active Publication Date: 2019-09-06
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0003] Pseudo-code extraction technology of multiplexed navigation signals is the basis of modern multiplexed GNSS signal monitoring and analysis. At present, the pseudo-code extraction of navigation signals with high signal-to-noise ratio mainly adopts demodulation methods such as BPSK, QPSK, and BPSK-LIKE. Realization, the tracking loop of this method is easy to lose lock, and it is easy to lose lock when the signal-to-noise ratio is low, resulting in decoding errors
In addition, it takes a lot of time and effort to develop BPSK, QPSK, BPSK-LIKE receivers

Method used

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  • Multiplexed navigation signal pseudo code extraction method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with specific drawings.

[0022] Typically, a navigation receiver tracking loop such as figure 1 shown. After entering the tracking loop, the input intermediate frequency signal is divided into two signals of in-phase (I branch) and quadrature (Q branch). The results are correlated with the local pseudo-codes generated by the code ring in advance (E), instant (P) and lag (L). The result of the correlation operation is passed through the integral clearer to obtain the six-way coherent integral value I E , I P , I L , Q E , Q P and Q L , will I P and Q P As the input of the carrier loop discriminator, the other items are used as the input of the code loop discriminator, so as to obtain the results of the two discriminators, and filter the two, and use the filtered result as the input of the carrier loop and code loop to adjust the local The phase and frequency of the carrier and the pseudo-code...

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Abstract

The invention discloses a multiplexed navigation signal pseudo code extraction method. The method utilizes the existing navigation receiver to realize real-time extraction of each component pseudo code of a multiplexed signal. According to the multiplexed navigation signal pseudo code extraction method based on a navigation receiver technology, the receiver is firstly adopted to realize carrier synchronization and pseudo code synchronization of a known civilian code signal; and then, by using multiplexed signal I / Q orthogonality and spectral separation characteristics, navigation signal pseudocode extraction is realized. Compared with demodulation methods based on BPSK, QPSK, BPSK-LIKE and the like, the method disclosed in the invention can avoid the influences of receiver losing lock onpseudo code extraction and has great advantages and feasibility. In addition, as no additional signal synchronization circuit is required, the development time can be greatly saved.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to the technical field of satellite navigation signal quality monitoring and analysis, in particular to a navigation signal pseudo code extraction method. Background technique [0002] Modern navigation signals almost all use the multiplexing technology system. The research on GNSS signal quality evaluation at home and abroad mainly focuses on binary phase shift keying BPSK modulation and simple binary offset carrier BOC modulation, without considering time, frequency, The multiplexing modulation that cannot be separated orthogonally, such as the modulation domain, does not consider the separation problem that signal quality evaluation first faces from the perspective of reception. Research on the optimal separation and quality assessment method of new multiplexed GNSS signals, quantitative analysis can reflect the time domain, frequency domain, and modulation domain characterist...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 魏海涛罗显志
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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