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

Outer radiation source radar direct wave suppression method being suitable for WiFi

A technology of external radiation source radar and direct wave, which is applied in radio wave measurement system, shaping network in transmitter/receiver, digital transmission system, etc., to achieve the effect of less computation and improved detection performance

Active Publication Date: 2018-07-10
WUHAN UNIV
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems caused by the fractional delay of the direct arrival wave of the external radiation source radar, the present invention proposes a method for suppressing the direct arrival wave of the WiFi external radiation source radar

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
  • Outer radiation source radar direct wave suppression method being suitable for WiFi
  • Outer radiation source radar direct wave suppression method being suitable for WiFi
  • Outer radiation source radar direct wave suppression method being suitable for WiFi

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0064] please see figure 1 , the method flowchart of the embodiment of the present invention, the signal in the embodiment of the present invention is the WiFi signal under the OFDM mode of IEEE 802.11g, the modulation mode is QPSK, the selected channel is 2 channels, the carrier frequency is 2417MHz, and the sampling frequency of the receiving end is 20MSPS. The present invention provides a radar direct wave suppression method suitable for WiFi external radiation sources, which is characterized in that it comprises the following steps:

[0065] Step 1: Obt...

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 an outer radiation source radar direct wave suppression method being suitable for WiFi. The outer radiation source radar direct wave suppression method being suitable for WiFiincludes the steps: by means of a least square channel estimation algorithm and an FIR filter, obtaining each subcarrier channel estimation value, and extracting each subcarrier channel estimation phase; by means of a pilot signal, extracting the residual frequency offset phase, and combined with each subcarrier channel estimation phase, obtaining the residual phase of each subcarrier channel; performing one time of curve fitting by means of each subcarrier residual phase to estimate fractional times of delay of the direct wave; through three times of batten interpolation and fractional timesof delay displacement of the direct wave, obtaining a reference signal after correction of time delay; and suppressing the direct wave of the monitoring signal by means of an expansion cancellation batch processing algorithm. Compared with the prior art, the outer radiation source radar direct wave suppression method being suitable for WiFi can improve the direct wave suppression performance of the monitoring channel, is conductive to target detection of a radar system, and is simple in the implementation method.

Description

technical field [0001] The invention belongs to the technical field of passive radar and the field of communication technology, and in particular relates to a method for suppressing the direct wave of an external radiation source radar monitoring channel signal based on a WiFi signal when there is a fractional delay of the direct wave at a radar receiving end. Background technique [0002] External radiation source radar has been extensively studied by the radar community because of its advantages of good concealment and no spectrum occupation. OFDM waveform digital signals that have been studied as non-cooperative irradiation sources of external radiation sources include: DAB (Digital Audio Broadcasting), DVB-T (Digital Video Broadcasting), DTMB (Digital Terrestrial Television), CMMB (China Digital Mobile multimedia video broadcasting), WiFi signal, mobile communication signal, etc. [0003] Among them, the WiFi signal based on the IEEE wireless local area network standard...

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): H04L25/03H04L25/02G01S7/40G01S7/285
CPCG01S7/285G01S7/4021H04L25/0204H04L25/0228H04L25/03159H04L25/03821
Inventor 饶云华徐凯文王胜涛万显荣柯亨玉龚子平程丰
Owner WUHAN UNIV
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