GPS L1 rapid and accurate capturing method and device and computer storage medium

An accurate and fast technology, applied in the field of satellite navigation, to achieve the effect of improving the capture sensitivity and reducing the amount of calculation

Pending Publication Date: 2022-07-01
西安开阳微电子有限公司
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in general, capture speed and ca

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
  • GPS L1 rapid and accurate capturing method and device and computer storage medium
  • GPS L1 rapid and accurate capturing method and device and computer storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0058] figure 1 Shown is a schematic flowchart of a method for fast and accurate GPS L1 acquisition provided by an embodiment of the present invention. Include the following steps:

[0059] S101. Perform half-chip sampling and spreading on the spreading code.

[0060] The sampling length of the spread spectrum code is changed to twice the original length, and the method is to repeatedly insert its own chips after each chip, assuming...

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 provides a GPS L1 rapid and accurate capturing method. The method comprises the following steps: carrying out half-chip sampling and expansion on a spreading code; performing intermediate frequency down-conversion and resampling on the satellite data; performing frequency mixing on a carrier signal obtained by accumulating a plurality of local carrier sequences corresponding to a preset Doppler frequency group and the processed satellite data to complete Doppler down-conversion so as to obtain zero Doppler data; segmenting the zero Doppler data of 2T (T < = 10) milliseconds by taking 1 millisecond as the length, and respectively performing coherent accumulation on the data of the first T milliseconds and the last T milliseconds to obtain two segments of satellite data with the length of 1 millisecond; performing FFT operation, complex number multiplication and IFFT operation on the processed spreading code and satellite data to obtain a cyclic correlation result; respectively solving moduli of the two sections of cyclic correlation results, searching a maximum value in the two sections of cyclic correlation results, if the maximum value exceeds a preset threshold, judging that coarse capture is successful, and calculating a corresponding satellite signal code phase at the moment; if the maximum value does not exceed the preset threshold, updating the preset Doppler frequency group to perform the next group of Doppler capture; and determining the section in which the maximum value appears in the two sections of satellites with the length of T milliseconds, and selecting the section of satellite data to carry out Doppler accurate acquisition. According to the method, the Doppler acquisition precision is improved while the search speed is increased.

Description

technical field [0001] The present invention relates to the technical field of satellite navigation, in particular to a method and device for fast and accurate GPS L1 acquisition. Background technique [0002] How to perform fast acquisition and achieve accurate Doppler acquisition on the basis of fast acquisition are the problems that need to be solved in the design of modern GPS receivers. [0003] The signal acquisition of satellites is achieved by correlation search, usually using a cyclic correlation algorithm. It is necessary to search for Doppler frequencies one by one at certain frequency intervals in the entire frequency search range; especially when it is necessary to increase the coherent integration time to improve the acquisition signal-to-noise ratio When the frequency search interval needs to be reduced, the frequency search times will be further increased. Therefore, reducing the frequency search times can achieve fast acquisition; while reducing the frequen...

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): G01S19/29G01S19/30
CPCG01S19/246
Inventor 王令欢汤加跃张柏华
Owner 西安开阳微电子有限公司
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