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

Spaceborne AIS Conflict Signal Separation Method Based on Improved Independent Component Analysis

An independent component analysis and signal separation technology, applied in channel estimation, baseband system components, electrical components, etc., can solve the problems of AIS signals not effectively separated, poor separation timeliness, poor timeliness, etc., to improve the signal separation effect, The effect of reducing the load on the star and simplifying the structure

Active Publication Date: 2019-06-21
NANJING UNIV OF SCI & TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention patent 201310492497.9 discloses a signal processing method for solving AIS signal time slot conflicts. Aiming at the background that the number of AIS signals with time slot conflicts is the same as the number of receiving antennas, the signals received by multiple antennas are separated by phase processing. Restoring the AIS signal that needs to be separated, the AIS signal of other channels cannot be effectively separated
Invention patent 201410502475.0 discloses a co-channel interference suppression method for spaceborne AIS based on receiving blind beamforming, using the constant mode characteristic of the AIS signal to implement blind beamforming on the user signal through the constant mode algorithm, after separating the desired signal and the interference signal, the The desired signal is detected, but this technology is difficult to separate when the difference in direction of arrival of conflicting signals is small, and only one of the multiple signals is separated
Invention patent 201410228651.6 discloses a conflicting signal processing method that can be used in the spaceborne AIS system. It uses the known information in the frame structure to perform synchronization and channel estimation, and then detects a signal, subtracts it after reconstruction, and calculates the remaining signal Repeat this process to complete the signal separation. This method has the disadvantages of complex equipment and poor timeliness
Invention patent 201410608054.6 discloses a serial separation method of spaceborne AIS signals based on parameter estimation. It mainly estimates the time delay, frequency offset, phase and other parameters of mixed spaceborne AIS baseband signals. The coherently detected symbols are reconstructed to realize the separation of one signal, and then repeat this process for the remaining signals to achieve serial separation, and mainly analyze the separation effect of the main signal. This method also makes the equipment complicated and the separation Poor timeliness

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
  • Spaceborne AIS Conflict Signal Separation Method Based on Improved Independent Component Analysis
  • Spaceborne AIS Conflict Signal Separation Method Based on Improved Independent Component Analysis
  • Spaceborne AIS Conflict Signal Separation Method Based on Improved Independent Component Analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] figure 1 It is the AIS conflict signal transceiving system model of the present embodiment, each ship has an antenna to be used for transmitting and forming the AIS signal of one GMSK modulation form, if N ships and ships of different AIS districts send N source signal S(t ), it is very likely to form conflicting signals at the spaceborne AIS receiver. The spaceborne AIS receiver receives through N antennas. Due to the linear mixing of each source signal, a blind source signal separation model is formed. The modeling is as follows:

[0047] X(t)=AS(t)+n(t),t=1,2,...,T

[0048] T is the total number of sampling points of the observation signal obtained by the conflict signal received by the antenna through the analog-to-digital converter ADC, t is the discrete time, X(t) is the known M-dimensional observation signal, and A is an unknown constant consisting of N×N The mixing matrix of , S(t) is the unknown N-dimensional source signal, and n(t) is the additive noise.

[...

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 discloses a satellite-borne AIS conflicting signal separation method based on improved independent component analysis. The method comprises the following steps: sampling by an analog-to-digital converter to form N channel receiving data; performing centralization processing and whitening processing on N paths of received observation signals; obtaining N paths of separation signals from the matrix preprocessed by the observation signals by using an improved ICA method based on the cuckoo algorithm and the Newton iterative algorithm; performing digital down-conversion, matched filtering and whitening filtering on the obtained N paths of separation signals; and decoding the N paths of separation signals after the whitening filtering by using the viterbi algorithm to obtain N AIS data frames. According to the satellite-borne AIS conflicting signal separation method disclosed by the invention, no frequency deviation, phase shift or amplitude estimation is required, a satellite-borne AIS receiver structure is simplified, and the satellite-borne load is relieved.

Description

technical field [0001] The invention belongs to the technical field of ship automatic identification system in wireless communication, and in particular relates to a space-borne AIS conflict signal separation method based on improved independent component analysis. Background technique [0002] In the early 1990s, the Maritime Equipment Federation of the International Association of Lighthouse Navigation Agencies first put forward a proposal to develop a common ship identification system. Afterwards, the International Maritime Organization, the International Telecommunication Union and the International Electrotechnical Commission all gave great attention and support, and finally developed a new navigation system, the Automatic Identification System (AIS). The main purpose of AIS is to facilitate the effective exchange of navigation data between ships and between ships and shores, so as to improve the safety of maritime navigation and the real-time monitoring of maritime eve...

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): H04B7/185H04L25/02
CPCH04B7/18515H04L25/0202
Inventor 芮义斌陈奇李鹏谢仁宏郭山红吕云涛
Owner NANJING UNIV OF SCI & TECH
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