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Title: System and method for detection of dispersed broadband signals

Abstract

A system and method for detecting the presence of dispersed broadband signals in real time. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos{2.phi.(t)}. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase .phi.(t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of .phi.'(t).

Inventors:
 [1];  [2]
  1. Austin, TX
  2. Los Alamos, NM
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
872325
Patent Number(s):
5910905
Application Number:
08/744435
Assignee:
National Instruments Corporation (Austin, TX)
Patent Classifications (CPCs):
G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; detection; dispersed; broadband; signals; detecting; presence; time; utilizes; bank; matched; filters; received; filter; respective; robust; template; designed; approximate; varies; spectrum; signal; templates; matches; occurs; data; determined; analyzed; transmitted; earth; analysis; desired; prove; extremely; useful; fields; including; satellite; communications; plasma; physics; interstellar; varying; follows; domain; assumed; form; cos; phi; instantaneous; frequency; equal; derivative; phase; trajectory; joint; time-frequency; representation; approximation; instantaneous frequency; matched filters; broadband signals; dispersed broadband; time domain; received data; broadband signal; matched filter; /708/

Citation Formats

Qian, Shie, and Dunham, Mark E. System and method for detection of dispersed broadband signals. United States: N. p., 1999. Web.
Qian, Shie, & Dunham, Mark E. System and method for detection of dispersed broadband signals. United States.
Qian, Shie, and Dunham, Mark E. Tue . "System and method for detection of dispersed broadband signals". United States. https://www.osti.gov/servlets/purl/872325.
@article{osti_872325,
title = {System and method for detection of dispersed broadband signals},
author = {Qian, Shie and Dunham, Mark E},
abstractNote = {A system and method for detecting the presence of dispersed broadband signals in real time. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos{2.phi.(t)}. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase .phi.(t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of .phi.'(t).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {6}
}

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