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

Timing Synchronization Method in LEO Satellite Communication System

A satellite communication system, timing synchronization technology, applied in the field of low-orbit satellite communication systems, can solve problems such as timing ambiguity

Active Publication Date: 2019-06-04
SHANGHAI ENG CENT FOR MICROSATELLITES
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, H.Minn proposed a kind of The improvement scheme eliminates the platform effect, but its timing measurement contains side lobes. When the signal-to-noise ratio is low, the side lobes may exceed the main lobe and cause timing ambiguity.

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
  • Timing Synchronization Method in LEO Satellite Communication System
  • Timing Synchronization Method in LEO Satellite Communication System
  • Timing Synchronization Method in LEO Satellite Communication System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The specific implementation of the timing synchronization method in the low-orbit satellite communication system provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] The purpose of the present invention is to provide a new design scheme of LEO satellite OFDM system timing synchronization, which uses another method to restructure the training symbols on the basis of the original H.Minn scheme, so as to propose a The new structure aims to eliminate the correlation peak of the timing position when performing the timing measurement of symbol synchronization, so as to solve the problem of timing ambiguity in the H.Minn scheme.

[0028] In the specific embodiment of the present invention, the new construction method adopted to the training symbols includes the following steps:

[0029] Step 1: Select an appropriate PN sequence (pseudo-random noise sequence) to construct training symbols. In this embodimen...

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 timing synchronization method in a low-orbit satellite communication system. The timing synchronization method is characterized by comprising the following steps: selecting longest linear feedback shift register sequences to construct a training symbol, wherein the training symbol has two front and back reverse parts, the total length is N, the front half part N / 2 is reverse to the back half part N / 2, and meanwhile two parts N / 4 in each N / 2 part form conjugate antisymmetry; further improving a time domain structure of the training symbol, so that the time domain structure becomes a dual conjugate antisymmetry structure; and calculating the improved training symbol according to a timing synchronization measurement function to obtain a time domain measurement result. By adoption of the method, related peak values of timing positions can be eliminated, no platform effect is generated, and meanwhile the sidelobe phenomenon is also well inhibited.

Description

technical field [0001] The invention relates to the technical field of low-orbit satellite communication systems, in particular to a timing synchronization method in the low-orbit satellite communication system. Background technique [0002] Satellite communication refers to the communication between two or more earth stations using artificial earth satellites as relay stations to forward or transmit radio waves between radio communication stations set up on the earth (including the ground, water surface and lower atmosphere). Satellite communication is a kind of space radio communication. Compared with other communication methods, satellite communication has the advantages of wide coverage, large communication capacity, long distance, not limited by geographical conditions, and stable and reliable performance. It is also compatible with optical fiber communication, digital microwave Together, communication has become the backbone of modern long-distance communication and ha...

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 Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2662H04L27/2665
Inventor 马天鸣李世举姜泉江李光
Owner SHANGHAI ENG CENT FOR MICROSATELLITES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com