GB2007065A - Direction finding system - Google Patents
Direction finding systemInfo
- Publication number
- GB2007065A GB2007065A GB7841298A GB7841298A GB2007065A GB 2007065 A GB2007065 A GB 2007065A GB 7841298 A GB7841298 A GB 7841298A GB 7841298 A GB7841298 A GB 7841298A GB 2007065 A GB2007065 A GB 2007065A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pair
- angle
- difference signal
- basis
- taken
- 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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
- G01S3/48—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
-
- 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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/04—Details
- G01S3/06—Means for increasing effective directivity, e.g. by combining signals having differently oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/002—Antennas or antenna systems providing at least two radiating patterns providing at least two patterns of different beamwidth; Variable beamwidth antennas
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Surgical Instruments (AREA)
Abstract
An antenna array for direction determination comprises two pairs of elongated end-firing log-periodic antenna elements 1, 2 and 3, 4, each pair fixed symmetrically to a reference plane 5 and forwardly convergent to it. The two antenna elements of one pair converge forwardly at an angle b, those of the other pair converge at an angle a = 1.5 b. From the detected and amplified signals of each pair there is obtained a difference signal designated L1, for the b-angle pair, L2 for the a-angle pair. A third difference signal L3 is obtained from L2-L1. The magnitude of each difference signal depends upon value of an angle V between a boresight axis 12 and a detected radiation source. An indication of V is taken on the basis of L1 if L1, L2 and L3 are on the same side of zero. A more precise indication of V is then taken on the basis of L2 by comparing absolute value of L2 with the absolute value of an adjustable reference signal. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7711967A SE411596B (en) | 1977-10-25 | 1977-10-25 | FOR ELECTROMAGNETIC RADIATION SENSITIVE DEVICE, FITTED TO LOCATE A TRANSMITTER |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2007065A true GB2007065A (en) | 1979-05-10 |
GB2007065B GB2007065B (en) | 1982-04-28 |
Family
ID=20332670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7841298A Expired GB2007065B (en) | 1977-10-25 | 1978-10-20 | Electromagnetic radiation sensor |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS54102849A (en) |
DE (1) | DE2845989C2 (en) |
DK (1) | DK150556C (en) |
FR (1) | FR2407486A1 (en) |
GB (1) | GB2007065B (en) |
NO (1) | NO145255C (en) |
SE (1) | SE411596B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2250153A (en) * | 1984-09-24 | 1992-05-27 | Siemens Ag | Discovering hovering helicopters |
GB2281671A (en) * | 1993-08-24 | 1995-03-08 | Cossor Electronics Ltd | Monopulse receiver |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59507604D1 (en) * | 1994-10-25 | 2000-02-17 | Daimler Chrysler Ag | RF seeker antenna system for missiles |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4023172A (en) * | 1959-12-17 | 1977-05-10 | Numax Electronics Incorporated | Monopulse system for cancellation of side lobe effects |
US3761927A (en) * | 1972-03-20 | 1973-09-25 | United Aircraft Corp | Rf phase detected interferometer radar |
GB1337099A (en) * | 1972-05-17 | 1973-11-14 |
-
1977
- 1977-10-25 SE SE7711967A patent/SE411596B/en not_active IP Right Cessation
-
1978
- 1978-10-20 GB GB7841298A patent/GB2007065B/en not_active Expired
- 1978-10-23 DE DE2845989A patent/DE2845989C2/en not_active Expired
- 1978-10-24 FR FR7830248A patent/FR2407486A1/en active Granted
- 1978-10-24 DK DK471578A patent/DK150556C/en not_active IP Right Cessation
- 1978-10-24 NO NO783602A patent/NO145255C/en unknown
- 1978-10-25 JP JP13146378A patent/JPS54102849A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2250153A (en) * | 1984-09-24 | 1992-05-27 | Siemens Ag | Discovering hovering helicopters |
GB2250153B (en) * | 1984-09-24 | 1992-10-14 | Siemens Ag | Methods of and systems for discovering hovering helicopters |
GB2281671A (en) * | 1993-08-24 | 1995-03-08 | Cossor Electronics Ltd | Monopulse receiver |
GB2281671B (en) * | 1993-08-24 | 1997-07-09 | Cossor Electronics Ltd | Improvements relating to radar antenna systems |
Also Published As
Publication number | Publication date |
---|---|
DK150556C (en) | 1988-02-08 |
NO145255C (en) | 1982-02-10 |
NO783602L (en) | 1979-04-26 |
FR2407486B1 (en) | 1984-10-26 |
FR2407486A1 (en) | 1979-05-25 |
JPS54102849A (en) | 1979-08-13 |
SE411596B (en) | 1980-01-14 |
DE2845989C2 (en) | 1983-08-18 |
DE2845989A1 (en) | 1979-04-26 |
DK150556B (en) | 1987-03-23 |
SE7711967L (en) | 1979-04-26 |
GB2007065B (en) | 1982-04-28 |
DK471578A (en) | 1979-04-26 |
NO145255B (en) | 1981-11-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19961020 |