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
View PDF1 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 calc

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0025] Such as figure 1 with figure 2 As shown, the dual-frequency GPS signal acquisition method based on the piecewise split basis Fourier transform designed in the present invention is carried out in the following steps in specific practical applications:

[0026] Step 001. Use the parallel code phase search 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 of C / A code n C / A If the capture fails, the differential coherent integration capture 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 of C / A code n C / A .

[0027] Step 002. According to the carrier Doppler frequency shift of the L1 signal f d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap