Method for capturing CL code in GPS 12C intermediate frequency signal

A technology of GPS positioning and intermediate frequency signals, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problem that hardware and software resources cannot meet the requirements of capture calculations, etc.

Inactive Publication Date: 2014-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

However, the length of the CL code is much longer than that of the C/A code and the CM code. If the traditional capture algorithm is use

Method used

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  • Method for capturing CL code in GPS 12C intermediate frequency signal
  • Method for capturing CL code in GPS 12C intermediate frequency signal
  • Method for capturing CL code in GPS 12C intermediate frequency signal

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Embodiment Construction

[0027] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the present invention has designed a kind of GPS positioning satellite L2C intermediate frequency signal CL code acquisition method, comprises the following steps:

[0029] Step 001. Receive a periodic L2C intermediate frequency signal sent by the positioning satellite, and compare it with the preset Doppler frequency shift value ω D =(ω D ) min Next, the local carrier signal with the same length as the L2C intermediate frequency signal is multiplied one by one according to the time sequence to obtain the signal S, where the period of the L2C intermediate frequency signal is T, (ω D ) min is the minimum value of the Doppler frequency shift search range;

[0030] Step 002. Divide the signal S into K segments on average according to the length, K≥2, the number of sampling points of ea...

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Abstract

The invention relates to a method for capturing a CL code in a GPS 12C intermediate frequency signal. According to the method, based on folding and average sampling conceptions, the mutually orthogonal characteristic among different bands of the CL code is firstly utilized, a folded code is formed through linear folding, and then relevant capturing is performed; in this way, the frequency of relevant calculations is effectively reduced; meanwhile, the average sampling method is used for reducing the number of relevant collection points every time Fourier transformation is performed, a traditional radix-8 Fourier transformation is replaced by a split-radix Fourier transformation for relevant calculation, the calculation amount and storage space needed in each relevant process are further reduced, and real-time performance of capturing is improved.

Description

technical field [0001] The invention relates to a method for capturing CL codes of L2C intermediate frequency signals of GPS positioning satellites. Background technique [0002] Global Positioning System (GPS), as the world's most widely used and most practical global precision timing, ranging, navigation, and positioning system, has been widely used in many fields such as car navigation, target monitoring, and mapping. However, with the development of the times and the continuous improvement of users' requirements for positioning accuracy, the traditional L1 civilian single-frequency GPS system has shown certain limitations. The GPS modernization plan adds the L2C civilian signal formed by time-division multiplexing of CM code and CL code to the L2 band, which reduces the structural limitations of the C / A code in the L1 frequency band, and is different from the traditional civil signal C / A code. Compared with the L2C signal, the carrier tracking threshold and the data dem...

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 曾庆喜唐琳琳徐亮张鹏娜杨英杰唐靖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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