CA2030678A1 - Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal - Google Patents

Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal

Info

Publication number
CA2030678A1
CA2030678A1 CA2030678A CA2030678A CA2030678A1 CA 2030678 A1 CA2030678 A1 CA 2030678A1 CA 2030678 A CA2030678 A CA 2030678A CA 2030678 A CA2030678 A CA 2030678A CA 2030678 A1 CA2030678 A1 CA 2030678A1
Authority
CA
Canada
Prior art keywords
signals
passing
level desired
real
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2030678A
Other languages
French (fr)
Other versions
CA2030678C (en
Inventor
William J. Skudera, Jr
Stuart D. Albert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Department of Army
Original Assignee
US Department of Army
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Department of Army filed Critical US Department of Army
Publication of CA2030678A1 publication Critical patent/CA2030678A1/en
Application granted granted Critical
Publication of CA2030678C publication Critical patent/CA2030678C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
    • H04K3/228—Elimination in the received signal of jamming or of data corrupted by jamming
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer

Abstract

ABSTRACT
A real-time rejection circuit for passing low level desired signals in the presence of one or more strong interfering signals. A chirp-Z transform system separates the various frequency components of a received signal into frequency segregated time domain signals. A power splitter separates the time domain signal into two paths. One path includes a modulator or switch that is normally biased "ON" for passing the time domain signal. The second path includes a diode detector that produces pulses of sufficient strength when a strong interfering component is present to override the bias and turn the modulator "OFF" for a sufficient period of time to attenuate the unwanted frequency components in the other path. The modulator output will primarily contain the low level desired frequency components that are passed through an inverse transform device for producing a frequency domain signal of the desired signal uncorrupted by unwanted signals.
CA002030678A 1990-01-08 1990-11-21 Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal Expired - Fee Related CA2030678C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/461,943 1990-01-08
US07/461,943 US4965581A (en) 1990-01-08 1990-01-08 Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal

Publications (2)

Publication Number Publication Date
CA2030678A1 true CA2030678A1 (en) 1991-07-09
CA2030678C CA2030678C (en) 1994-02-01

Family

ID=23834550

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002030678A Expired - Fee Related CA2030678C (en) 1990-01-08 1990-11-21 Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal

Country Status (2)

Country Link
US (1) US4965581A (en)
CA (1) CA2030678C (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5295151A (en) * 1985-10-22 1994-03-15 The United States Of America As Represented By The Secretary Of The Army Transition detection circuit for PSK signals using the SAW Chirp-Z algorithm (U)
CA1333413C (en) * 1988-07-13 1994-12-06 Andre Gagnon Frequency independent strong signal suppressor
US5355091A (en) * 1992-05-21 1994-10-11 The United States Of America As Represented By The Secretary Of The Army Apparatus for real time interference signal rejection
US5257284A (en) * 1992-11-16 1993-10-26 The United States Of America As Represented By The Secretary Of The Army Circuit for accurately measuring phase relationship of BPSK signals
US5424674A (en) * 1992-11-18 1995-06-13 The United States Of America As Represented By The Secretary Of The Army Wide dynamic range detection circuit
US5247308A (en) * 1993-02-24 1993-09-21 The United States Of America As Represented By The Secretary Of The Army Detection and characterization of LPI signals
US5495253A (en) * 1994-11-17 1996-02-27 The United States Of America As Represented By The Secretary Of The Army Soliton rejection filter
CA2279161C (en) 1999-07-27 2005-10-25 Jim P.Y. Lee An lpi digital receiver
US6473596B1 (en) * 1999-12-20 2002-10-29 The United States Of America As Represented By The Secretary Of The Air Force Close proximity transmitter interference limiting
JP4007498B2 (en) * 2002-11-15 2007-11-14 三菱電機株式会社 Automotive radar equipment
US20060017607A1 (en) * 2004-07-26 2006-01-26 Kyocera Corporation Amplitude modulator, selector switch, high frequency transmitting/receiving apparatus including the same, and radar apparatus, and radar apparatus-mounting vehicle and radar apparatus-mounting small ship
US7336220B2 (en) * 2006-06-01 2008-02-26 M/A-Com, Inc. Method and apparatus for equalizing broadband chirped signal
RU2569331C1 (en) * 2014-09-18 2015-11-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Рязанский государственный радиотехнический университет" Passive jamming doppler phase measuring device
RU2628904C1 (en) * 2016-10-11 2017-08-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Рязанский государственный радиотехнический университет" Computer for improvement of interference
RU2680824C1 (en) * 2017-12-11 2019-02-27 Федеральное государственное бюджетное образовательное учреждение высшего образования "Рязанский государственный радиотехнический университет" Calculator for interference rejection
RU182620U1 (en) * 2018-01-30 2018-08-24 Федеральное государственное бюджетное образовательное учреждение высшего образования "Рязанский государственный радиотехнический университет" ADAPTIVE COMPENSATOR OF PASSIVE INTERFERENCE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155912A (en) * 1961-05-01 1964-11-03 Gen Electric Automatic gating circuit
US3495244A (en) * 1968-10-07 1970-02-10 Hazeltine Research Inc Interference discriminating apparatus
US3588534A (en) * 1969-05-07 1971-06-28 Collins Radio Co Peak-slope frequency discriminator
US4038539A (en) * 1976-02-23 1977-07-26 American Electronic Laboratories, Inc. Adaptive pulse processing means and method
US4521917A (en) * 1983-11-14 1985-06-04 General Electric Company Noise blanking circuit and method

Also Published As

Publication number Publication date
CA2030678C (en) 1994-02-01
US4965581A (en) 1990-10-23

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Legal Events

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MKLA Lapsed