Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Variable gain high sensitivity GPS receiver baseband frequency tracking method

A GPS signal and carrier tracking technology, used in instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve problems such as carrier synchronization and bit synchronization difficulties, achieve simple, effective and easy to implement, improve receiving sensitivity, high GPS The effect of signal tracking

Active Publication Date: 2007-10-10
GUANGDONG DESAY CORP
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the case of low signal-to-noise ratio of the received GPS signal, carrier synchronization and bit synchronization are difficult

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
  • Variable gain high sensitivity GPS receiver baseband frequency tracking method
  • Variable gain high sensitivity GPS receiver baseband frequency tracking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Fig. 1 is a block diagram of the carrier tracking loop in the present invention, and the meanings of the signals in the figure are as follows. 101 is the output of the Prompt correlator in the traditional GPS receiver, and the signal can be obtained from the hardware register by means of interrupt or software query. The new output value 101 of the correlator obtained each time is sent to a four-quadrant arctangent frequency detector and a four-quadrant arctangent phase detector respectively, and a frequency error estimation signal 102 and a phase error estimation signal 103 can be obtained respectively. 102 and 103 The control signal 104 of the digitally controlled oscillator is obtained after post-processing by the loop filter, which controls the frequency of the local reproduced carrier generated by the digitally controlled oscillator, and 105 is the output signal of the digitally controlled oscillator.

[0018] Fig. 2 is a schematic diagram of the method for tracking...

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 method for tracking base band frequency of high-sensitivity GPS receiver in variable gain mode includes enabling to eliminate phase estimation error caused by data modulation when carrier wave tracking loop is restrained quickly by making selection on frequency lock ring frequency detection algorithm in carrier wave tracking loop and phase-lock loop phase detection algorithm, enabling to obviously raise sensitivity of receiver and to decrease frequency tracking error by utilizing software to vary phase detector gain and frequency detector gain as well as digital control oscillator gain in carrier wave tracking loop at each stage in carrier-wave track.

Description

technical field [0001] The invention relates to the technical field of global positioning, in particular to a method for carrier tracking of satellite signals in a high-sensitivity receiver. Background technique [0002] Commonly used GPS (Global Satellite Positioning System) receivers usually use multi-channel correlators to track satellite signals and demodulate navigation data after completing the capture of GPS signals. The GPS signals transmitted by the navigation satellites are all direct sequence spread spectrum signals, the carrier frequency is 1.57542GHz, and the code rate of the coarse code (C / A) code is 1.023Mchip / s. The code length of the C / A code sequence is 1023, and the corresponding time period is 1 millisecond. Each satellite transmits different C / A codes, and code division multiple access is realized at the receiver side, so there is almost no interference between the satellite signals received by the receiver. The navigation message is modulated on each ...

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): G01S5/14G01S19/29
Inventor 李金海陈杰牟荣增
Owner GUANGDONG DESAY CORP
Features
  • Generate Ideas
  • 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