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 samplingInfo
- 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
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.
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)
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 |
-
1973
- 1973-05-22 FR FR7318518A patent/FR2231013A1/en active Granted
Non-Patent Citations (1)
Title |
---|
NEANT * |
Cited By (4)
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 |