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Double-frequency GPS signal capturing method based on segmented and split-radix Fourier transform

A technology of GPS signals and digital intermediate frequency signals, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as increased calculations, unsatisfactory capture calculations, and increased storage space, so as to reduce the search range and reduce The amount of calculation and storage space, the effect of improving the calculation speed

Inactive Publication Date: 2014-03-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +2
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Problems solved by technology

[0003] Since the length of the CM and CL codes in the L2C signal is 10 times and 750 times that of the C / A code, if the original C / A code capture algorithm is still followed, the amount of calculation will increase significantly, and the required storage space will greatly increase , the existing hardware conditions will not be able to meet the requirements of the capture calculation

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  • Double-frequency GPS signal capturing method based on segmented and split-radix Fourier transform
  • Double-frequency GPS signal capturing method based on segmented and split-radix Fourier transform
  • Double-frequency GPS signal capturing method based on segmented and split-radix Fourier transform

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[0024] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] like figure 1 and figure 2 Shown, the dual-frequency GPS signal acquisition method based on segmental split base Fourier transform that the present invention designs is carried out in the specific practical application process as follows:

[0026] Step 001. Use the parallel code phase search and acquisition algorithm to capture the carrier Doppler frequency shift f of the L1 signal in the GPS digital intermediate frequency signal dr1 and the initial phase n of the C / A code C / A , if the acquisition fails, the differential coherent integration acquisition algorithm is used to capture the carrier Doppler frequency shift f of the L1 signal in the GPS digital intermediate frequency signal dr1 and the initial phase n of the C / A code C / A .

[0027] Step 002. According to the carrier Doppler frequency shift f of the...

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Abstract

The invention relates to a double-frequency GPS signal capturing method based on segmented and split-radix Fourier transform. The method comprises the first step of capturing an L1 signal, the second step of obtaining auxiliary information for capturing an L2C signal according to the carrier doppler frequency shift of the obtained L1 signal and the initial phase position of a C / A code, and the third step of carrying out segmentation on the L2C signal and adopting the split-radix Fourier transform to capture the double-frequency GPS signal on the basis of segments. The computing amount and the storing space are reduced to a very large extent during the capturing process, the computing speed is improved, and a theoretical foundation is laid for achieving an L1 / L2C double-frequency GPS signal receiver on an embedded type system.

Description

technical field [0001] The invention relates to a method for acquiring dual-frequency GPS signals based on segmental division basis Fourier transform. Background technique [0002] With the development of the times and the continuous improvement of civilian users' requirements for positioning accuracy, the L1 single-frequency GPS system has shown certain limitations. The GPS (Global Positioning System, Global Positioning System) modernization plan adds civilian L2C signals to the L2 band. Dual-frequency signals can correct ionospheric delay errors to obtain more accurate positioning settlement results and improve positioning accuracy. Moreover, the L2C signal adopts a special civil medium length code (CM) and civil long code (CL) time division multiplexing method, which has a lower carrier tracking threshold and data demodulation threshold, and has better correlation performance, and is more suitable for It is used in places with weak signals such as indoors and jungles. ...

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Application Information

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IPC IPC(8): G01S19/24
CPCG01S19/29G01S19/30G01S19/32
Inventor 曾庆喜唐琳琳杨英杰黄玉划陆新芳陈小惠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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