FR672743A - Device for tracking aircraft by sound - Google Patents
Device for tracking aircraft by soundInfo
- Publication number
- FR672743A FR672743A FR672743DA FR672743A FR 672743 A FR672743 A FR 672743A FR 672743D A FR672743D A FR 672743DA FR 672743 A FR672743 A FR 672743A
- Authority
- FR
- France
- Prior art keywords
- sound
- tracking aircraft
- aircraft
- tracking
- 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.)
- Expired
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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR672743T | 1928-07-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR672743A true FR672743A (en) | 1930-01-06 |
Family
ID=9017697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR672743D Expired FR672743A (en) | 1928-07-24 | 1928-07-24 | Device for tracking aircraft by sound |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR672743A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE744802C (en) * | 1938-10-29 | 1944-01-26 | Eberspaecher J | Device for locating noises |
-
1928
- 1928-07-24 FR FR672743D patent/FR672743A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE744802C (en) * | 1938-10-29 | 1944-01-26 | Eberspaecher J | Device for locating noises |
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