FR2231013A1 - Identification of low flying aircraft by sound - involves eliminating doppler ambiguity by variable time sampling - Google Patents

Identification of low flying aircraft by sound - involves eliminating doppler ambiguity by variable time sampling

Info

Publication number
FR2231013A1
FR2231013A1 FR7318518A FR7318518A FR2231013A1 FR 2231013 A1 FR2231013 A1 FR 2231013A1 FR 7318518 A FR7318518 A FR 7318518A FR 7318518 A FR7318518 A FR 7318518A FR 2231013 A1 FR2231013 A1 FR 2231013A1
Authority
FR
France
Prior art keywords
identification
low flying
sound
flying aircraft
variable 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
FR7318518A
Other languages
French (fr)
Other versions
FR2231013B1 (en
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.)
TECH RADIOELECT ELECTRO FS
Original Assignee
TECH RADIOELECT ELECTRO FS
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 TECH RADIOELECT ELECTRO FS filed Critical TECH RADIOELECT ELECTRO FS
Priority to FR7318518A priority Critical patent/FR2231013A1/en
Publication of FR2231013A1 publication Critical patent/FR2231013A1/en
Application granted granted Critical
Publication of FR2231013B1 publication Critical patent/FR2231013B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
    • G01S5/20—Position of source determined by a plurality of spaced direction-finders
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/87—Combinations of sonar systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/001—Acoustic presence detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The identification of the type of low flying aircraft is made by a fine analysis of the audible spectrum picked up by a microphone. Peaks in the spectrum correspond to turbine blade noise, etc., and can be unique to an aircraft. Ambiguity caused by Doppler shifts are eliminated by sampling the input waveform at variable times according to the speed which must be known. The speed can be obtained by radar or by a triangular net of microphones. Preferably the inputs from all microphones being used for spectral analysis, for several channels could be processed at once, are passed through sample-hold units E1V1 and then through a further sampler E2V1 driven by a shift register R. The outputs are time multiplexed and pass through an analogue to digital converter and thence via gates to registers RV1. The analyser is not shown.
FR7318518A 1973-05-22 1973-05-22 Identification of low flying aircraft by sound - involves eliminating doppler ambiguity by variable time sampling Granted FR2231013A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7318518A FR2231013A1 (en) 1973-05-22 1973-05-22 Identification of low flying aircraft by sound - involves eliminating doppler ambiguity by variable time sampling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7318518A FR2231013A1 (en) 1973-05-22 1973-05-22 Identification of low flying aircraft by sound - involves eliminating doppler ambiguity by variable time sampling

Publications (2)

Publication Number Publication Date
FR2231013A1 true FR2231013A1 (en) 1974-12-20
FR2231013B1 FR2231013B1 (en) 1977-09-02

Family

ID=9119751

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7318518A Granted FR2231013A1 (en) 1973-05-22 1973-05-22 Identification of low flying aircraft by sound - involves eliminating doppler ambiguity by variable time sampling

Country Status (1)

Country Link
FR (1) FR2231013A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064477A1 (en) * 1981-04-23 1982-11-10 Niklaus Loeliger Method and assembly to locate detonations
DE3216183A1 (en) * 1981-04-27 1986-07-17 Fried. Krupp Gmbh, 4300 Essen Method for locating gunsights
WO1987002144A1 (en) * 1985-10-05 1987-04-09 Plessey Overseas Limited Method and device for locating the position of a sound source
DE3543793A1 (en) * 1985-12-12 1987-06-19 Krupp Gmbh Method for determining the location of blast sources

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064477A1 (en) * 1981-04-23 1982-11-10 Niklaus Loeliger Method and assembly to locate detonations
DE3216183A1 (en) * 1981-04-27 1986-07-17 Fried. Krupp Gmbh, 4300 Essen Method for locating gunsights
WO1987002144A1 (en) * 1985-10-05 1987-04-09 Plessey Overseas Limited Method and device for locating the position of a sound source
DE3543793A1 (en) * 1985-12-12 1987-06-19 Krupp Gmbh Method for determining the location of blast sources

Also Published As

Publication number Publication date
FR2231013B1 (en) 1977-09-02

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Legal Events

Date Code Title Description
ST Notification of lapse