Feedforward/feedback combined type carrier wave tracking method of cluster link

A carrier tracking and combined technology, applied in the fields of aviation data link and radio navigation

Inactive Publication Date: 2010-07-07
NAT SPACE SCI CENT CAS
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The precise tracking of the spreading code dep

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
  • Feedforward/feedback combined type carrier wave tracking method of cluster link
  • Feedforward/feedback combined type carrier wave tracking method of cluster link
  • Feedforward/feedback combined type carrier wave tracking method of cluster link

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0110] The invention relates to a method for carrier tracking and parameter estimation of cluster link burst frequency spread signals, which can realize the whole system structure and algorithm on the digital signal processor DSP and FPGA of the circuit board.

[0111] 1. Feedforward / feedback carrier tracking control method

[0112] The present invention proposes a brand new carrier tracking method: feedforward+feedback carrier tracking control strategy. The open-loop feedforward control link of this method estimates carrier phase and Doppler frequency tracking residuals based on statistical filtering algorithm, and iteratively integrates and accumulates the current (kth step) carrier tracking residual estimation value to obtain the next step (k+1st step) ) Doppler frequency value forecast output to obtain high dynamic and global linear characteristics; the closed-loop feedback control link is a third-order Costas PLL, and the carrier phase and frequency tracking residual esti...

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 feedforward/feedback combined type carrier wave tracking method of a cluster link, which belongs to the technical field of aerial data chains and radio navigation. The invention provides a system structural frame capable of realizing a high-dynamic signal precise tracking and measuring method of the cluster link on a digital signal processor DSP and a FPGA of a circuit board. The invention provides a high-order statistic estimation model for tracking and estimating the Doppler frequency parameter of the link, and the high-order statistic estimation model is directlyused for the iterative feedforward control of the carrier wave tracking. At the same time, a closed loop carrier wave tracking structure of a three-order PLL is maintained for realizing the precise tracking, and the frequency spreading code precise tracking is realized through relaying on carrier wave auxiliary code. The invention overcomes the defects of frequent losing lock and low precision ofthe traditional high-dynamic receiving machine under the severe dynamic condition in the traditional sense. The method disclosed by the invention can be widely used for satellite navigation receivingmachines, distance measuring systems and communication systems based on inhabiting carrier wave modulation direct sequence frequency spreading systems.

Description

technical field [0001] The invention relates to a feedforward / feedback combined carrier tracking method for cluster links, belonging to the technical fields of aviation data links and radio navigation. Background technique [0002] At present, in the field of aviation data link and radio navigation technology, there are certain difficulties in signal acquisition, tracking and measurement of aircraft cluster link under harsh conditions. The harsh conditions caused by various factors will affect the acquisition and tracking of spread spectrum signals. Bad conditions are defined here from three perspectives: [0003] 1) The motion dynamics are bad: ① The relative motion displacement (zero-order derivative) of two moving bodies can be derived to a high-order time, and the derivatives of each order are: velocity (first-order derivative), acceleration (second-order derivative), jerk / impact acceleration (Third order derivative) and other changes are relatively large; ②Displacement...

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): G01S19/29
Inventor 杨宜康孙辉先陈晓敏
Owner NAT SPACE SCI CENT CAS
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