Unlock instant, AI-driven research and patent intelligence for your innovation.

Correlation system and method for gnss receiver

A global navigation satellite and related computing technology, which is applied in the field of related computing systems of fast Fourier transform technology, can solve problems such as a large amount of memory and a large burden on hardware costs, achieve good performance and reduce hardware complexity.

Inactive Publication Date: 2009-08-05
MEDIATEK INC
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fast Fourier transform provides powerful correlation computing capabilities, which help to quickly acquire signals, but requires a large amount of memory for subsequent processing, and hardware costs are a big burden

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
  • Correlation system and method for gnss receiver
  • Correlation system and method for gnss receiver
  • Correlation system and method for gnss receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] According to the present invention, the back-end correlation fast Fourier transform can also work together with the time-domain correlation operation. Figure 4 A schematic diagram showing the correlation computing system of the GNSS receiver according to the second embodiment of the present invention. Figure 4 Components of the GNSS receiver before the correlator 110 , such as the antenna connected thereto, the RF front-end and the Doppler removal unit, are omitted for clarity and brevity. see together figure 2 , in this embodiment, the receiver has a correlator 110 in the time domain, and the correlator 110 uses each hypothetical local PRN code replica delay form (version) to perform a correlation operation on the input data stream in a time-division multiplexing manner to obtain the following Terminal-related data (step S60), the data stream has been down-converted and digitized as is well known in the art. The correlation results of each hypothesis are accumulat...

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

A correlation system for a GNSS receiver uses an FFT engine to perform correlation and post-FFT operation. The FFT engine executes FFT operation to an input data stream so as to generate a frequency-domain correlation with frequency-domain C / A code and IFFT operation to the frequency-domain correlation result to generate post correlation data for each hypothesis, and executes FFT operation to the post correlation data of a selected hypothesis to generate a post-correlation FFT result in a programmable TDM manner. In the present invention, in addition to the FFT engine, some basic components are shared by a correlation stage and a post-correlation stage. Therefore, hardware complexity can be reduced and good performance of the receiver is maintained.

Description

technical field [0001] The present invention relates to a global navigation satellite system (Global Navigation Satellite System, GNSS) receiver, in particular to a correlation calculation (correlation) system and method using Fast Fourier Transform (FFT) technology for the GNSS receiver. Background technique [0002] The Fast Fourier Transform is a well-known technique for processing digital signals and has been used in satellite communications, such as the Global Navigation Satellite System. For GNSS receivers, Time to First Fix (TTFT) has always been a critical issue for users. Time to first fix usually refers to the time it takes to find at least 4 satellites during 3D positioning. In order to improve time-to-first-fix efficiency, it is undesirable to acquire satellite signals with long integration times. Fast Fourier transform provides a powerful solution that can improve the speed of correlation operations and the efficiency of signal acquisition and tracking. [00...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/04G01S5/02
CPCG01S19/24G01S19/37
Inventor 魏睿民李明鸿张志祥
Owner MEDIATEK INC
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com