GB1518604A - Radio direction-finding apparatus - Google Patents
Radio direction-finding apparatusInfo
- Publication number
- GB1518604A GB1518604A GB1805176A GB1805176A GB1518604A GB 1518604 A GB1518604 A GB 1518604A GB 1805176 A GB1805176 A GB 1805176A GB 1805176 A GB1805176 A GB 1805176A GB 1518604 A GB1518604 A GB 1518604A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- period
- bearings
- during periods
- combined
- 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
- 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
- G01S3/143—Systems for determining direction or deviation from predetermined direction by vectorial combination of signals derived from differently oriented antennae
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
1518604 Radio direction finding DEFENCE SECRETARY OF STATE FOR 29 April 1977 [4 May 1976 (2)] 18051/76 and 18052/76 Heading H4D A radio direction finder comprises a pair of crossed loops A, B, Fig. 1, the outputs of which are combined in antiphase in a common amplification channel 7 via individual modulators 5, 6 wherein one output is variably attenuated so as to be increasing with time during a given period when the other output is synchronously variably attenuated so as to be decreasing with time. The combined output of the channel contains a zero cross-over, the timing of which within the period is indicative of the radio bearing. Referring to Figs. 5. 6 wherein four possible bearings are shown for orthogonally crossed loops, and modulator 5 increases its output during periods I and III and decreases during periods II and IV, whilst modulator 6 decreases during periods I and III and increases during periods II and IV (i.e. a phase reversal occurs at the end of period II), the outputs of modulators 5 and 6 for the four bearings are as shown at (a) and (b) respectively. (c) and (d) showing the combined outputs indicate that a zero crossing will be detected in period I for bearings # 1 and # 3 and in period II for bearings # 2 and # 4 . This 180‹ ambiguity is resolved using the output of an omnidirectional antenna C, made at 10 in phase with one of the possible phases of the combined output. The zero crossing detector 12 gives a pulse indicating by its polarity, the direction of the crossing. The transient producing phase reversal is avoided by amplitude modulating the loop signals by sine and -cosine signals respectively the loops being centre earth balanced. Using such modulation the position of the zero crossing, expressed as an angle is equal to the bearing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1805176A GB1518604A (en) | 1977-04-29 | 1977-04-29 | Radio direction-finding apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1805176A GB1518604A (en) | 1977-04-29 | 1977-04-29 | Radio direction-finding apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1518604A true GB1518604A (en) | 1978-07-19 |
Family
ID=10105791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1805176A Expired GB1518604A (en) | 1977-04-29 | 1977-04-29 | Radio direction-finding apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1518604A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4489327A (en) * | 1981-03-24 | 1984-12-18 | Racal Communications Equipment Limited | Direction finding |
-
1977
- 1977-04-29 GB GB1805176A patent/GB1518604A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4489327A (en) * | 1981-03-24 | 1984-12-18 | Racal Communications Equipment Limited | Direction finding |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |