GB876813A - Improvements in or relating to radio beacons - Google Patents
Improvements in or relating to radio beaconsInfo
- Publication number
- GB876813A GB876813A GB3713858A GB3713858A GB876813A GB 876813 A GB876813 A GB 876813A GB 3713858 A GB3713858 A GB 3713858A GB 3713858 A GB3713858 A GB 3713858A GB 876813 A GB876813 A GB 876813A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- carrier
- source
- radio
- receiver
- 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
- G01S1/02—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 radio waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radio Relay Systems (AREA)
Abstract
876,813. Radio navigation. MARCONI'S WIRELESS TELEGRAPH CO. Ltd. Nov. 17, 1959 [Nov. 18, 1958], No. 37138/58. Class 40(7) In a radio direction-finding receiver, signals, the frequency of which is indicative of the bearing of the receiver from a transmitter, are received on an omni-directional aerial 10 and are passed to two channels, the first including a filter 13 sharply tuned to the carrier frequency, and the second including a wide-band filter 11 which passes the carrier and the side-band frequencies. The channels feed to an amplitude modulation detector 12 whose output is passed to a frequency detector 15 which is coupled to an indicator 16 to indicate the frequency and hence the bearing. Also according to the invention, a radio beacon system includes a receiver as described above and a radio beacon which emits a beam comprising a carrier modulated by a sub-carrier, the subcarrier being frequency modulated in accordance with the azimuthal direction of the beam so that differing directions of azimuth are characterized by differing values of the frequency of the subcarrier. The beacon comprises an aerial 1 rotated in azimuth by a motor 2 which is also coupled to a variable frequency source 8. The instantaneous frequency of this source is characteristic of the instantaneous direction of the aerial 1. Source 6 generates the sub-carrier which is frequency modulated in unit 7, the resultant output modulating the carrier from source 4 in amplitude modulator 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3713858A GB876813A (en) | 1958-11-18 | 1958-11-18 | Improvements in or relating to radio beacons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3713858A GB876813A (en) | 1958-11-18 | 1958-11-18 | Improvements in or relating to radio beacons |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB876813A true GB876813A (en) | 1961-09-06 |
Family
ID=10394045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3713858A Expired GB876813A (en) | 1958-11-18 | 1958-11-18 | Improvements in or relating to radio beacons |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB876813A (en) |
-
1958
- 1958-11-18 GB GB3713858A patent/GB876813A/en not_active Expired
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