GB1333804A - Radio-navigation station - Google Patents
Radio-navigation stationInfo
- Publication number
- GB1333804A GB1333804A GB3223471A GB3223471A GB1333804A GB 1333804 A GB1333804 A GB 1333804A GB 3223471 A GB3223471 A GB 3223471A GB 3223471 A GB3223471 A GB 3223471A GB 1333804 A GB1333804 A GB 1333804A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aerial
- duration
- frequency
- pulses
- series
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0822—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection according to predefined selection scheme
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
- H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
1333804 Radio direction-finders and radio navigation THOMSON-CSF 8 July 1971 [17 July 1970 (2) 18 May 1971 (2)] 32234/71 Heading H4D In a radio direction-finder or radio beacon, of the basic kind utilizing a rotating cardioid pattern, a plurality n of identical aerials each having a rotating cardioid pattern are utilized and a receiving device (in the case of a directionfinder), or a transmitting device (in the case of a beacon), is successively connected to each of the aerials for a predetermined duration. Direction-finders, Fig. 1.-Each aerial, e.g. 1, comprises a dipole 11 and a ring of dipole reflectors successively rendered operative. 1f # is the duration for which a reflector is rendered operative, clock pulses from a generator 10 at a repetition frequency f = (1/#) actuate a generator 7 to give a series of pulses S i (i = 1, 2 ... N) where i is the position number of a reflecting dipole in each aerial and the pulses in each series have a duration # = T/N, the pulses of the series S i being shifted by # relative to those in series S; - 1. Pulses J on line 42 are of repetition frequency F, the frequency of rotation of the cardioid patterns. In the course of a cycle of duration nT and taking the jth (j = 1, ... n) time interval of duration T, device 9 directs the N series S i respectively to the corresponding reflectors of the jth aerial at the same time as it connects the centre dipole thereof to receiving device 8, synchronization of a phase signal with aerial pattern rotation being ensured by pulses J applied also to line 43. During the complete cycle of duration nT, the phases, relative to the reference phase, P + #P j ensure where #P j represents the error (due to reflected rays from the surroundings) corresponding to the jth aerial; averaging by low-frequency filtering in the receiver and by the bearing indicator yields a decreased final error, Figs. 2 and 3 (neither shown). Beacons, Fig. 4.-A phase beacon is based on a single-aerial rotating cardioid-pattern comprising an omnidirectional element fed by a first H.F. signal amplitude-modulated by a subcarrier which is itself frequency-modulated by the phase reference signal frequency F (about 30 Hz) and two crossed dipoles respectively fed with two other H.F. signals, of the same frequency #/2# and the same H.F. phase as the first H.F. signal, and of the respective forms (sin 2# Ft sin # t) and (cos 2# Ft sin # t). In the embodiment n = six such aerials 101 ... 106 are employed, the above three signals being provided by generators 108, 109, 110. The n aerials may be fed (i) successively, each for a duration T = 1/F, or (ii) successively, but each for a duration # = T/p(p>1), the number p being such that the fundamental switching aerial-switching frequency and its harmonics lie outside the low-frequency band in the corresponding receiver and also outside any lowfrequency bands used in auxiliary modulation of the H.F. signals (e.g. for identification and telephony). Other aerial dispositions mentioned are a diamond shape and, where the offending obstacle is known, a linear arrangement normal to the direction of the obstacle.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7026433A FR2108146B1 (en) | 1970-07-17 | 1970-07-17 | |
FR7026432A FR2112029B1 (en) | 1970-07-17 | 1970-07-17 | |
FR7117978A FR2135115B2 (en) | 1970-07-17 | 1971-05-18 | |
FR7117979A FR2137312B2 (en) | 1970-07-17 | 1971-05-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1333804A true GB1333804A (en) | 1973-10-17 |
Family
ID=27446069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3223471A Expired GB1333804A (en) | 1970-07-17 | 1971-07-08 | Radio-navigation station |
Country Status (10)
Country | Link |
---|---|
US (1) | US3747101A (en) |
JP (1) | JPS5316677B1 (en) |
AU (1) | AU457255B2 (en) |
BE (1) | BE769039A (en) |
CA (1) | CA938354A (en) |
DE (1) | DE2135737C2 (en) |
GB (1) | GB1333804A (en) |
LU (1) | LU63543A1 (en) |
NL (1) | NL172187C (en) |
NO (1) | NO131692C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5559756U (en) * | 1978-10-20 | 1980-04-23 | ||
JPH01141846U (en) * | 1988-03-25 | 1989-09-28 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2994081A (en) * | 1953-03-06 | 1961-07-25 | Edward C Jordan | Radio direction finder |
DE1123000B (en) * | 1958-07-16 | 1962-02-01 | Standard Elektrik Lorenz Ag | Arrangement for wireless determination of direction based on the Doppler effect |
-
1971
- 1971-06-25 BE BE769039A patent/BE769039A/en not_active IP Right Cessation
- 1971-06-30 US US00158486A patent/US3747101A/en not_active Expired - Lifetime
- 1971-07-08 GB GB3223471A patent/GB1333804A/en not_active Expired
- 1971-07-13 AU AU31135/71A patent/AU457255B2/en not_active Expired
- 1971-07-14 JP JP5283971A patent/JPS5316677B1/ja active Pending
- 1971-07-15 LU LU63543D patent/LU63543A1/xx unknown
- 1971-07-16 CA CA118476A patent/CA938354A/en not_active Expired
- 1971-07-16 NL NLAANVRAGE7109881,A patent/NL172187C/en not_active IP Right Cessation
- 1971-07-16 DE DE2135737A patent/DE2135737C2/en not_active Expired
- 1971-07-16 NO NO2738/71A patent/NO131692C/no unknown
Also Published As
Publication number | Publication date |
---|---|
AU3113571A (en) | 1973-01-18 |
JPS5316677B1 (en) | 1978-06-02 |
NO131692C (en) | 1975-07-09 |
DE2135737A1 (en) | 1972-01-20 |
CA938354A (en) | 1973-12-11 |
NO131692B (en) | 1975-04-01 |
AU457255B2 (en) | 1975-01-23 |
DE2135737C2 (en) | 1982-09-09 |
BE769039A (en) | 1971-11-03 |
US3747101A (en) | 1973-07-17 |
NL172187C (en) | 1983-07-18 |
LU63543A1 (en) | 1971-11-16 |
NL7109881A (en) | 1972-01-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2257320A (en) | Direction finding system | |
US3950753A (en) | Stepped cardioid bearing system | |
US2252083A (en) | Radio traffic control | |
GB1015592A (en) | Radio beacon | |
GB1572790A (en) | Radio navigation system | |
US3550130A (en) | Passive direction finder | |
GB1333804A (en) | Radio-navigation station | |
US3290685A (en) | Omni-range doppler beacons and direction finding systems | |
US3633204A (en) | Distance-measuring equipment | |
GB994752A (en) | Radio navigation system | |
US2717379A (en) | Radio navigation | |
US2471648A (en) | Equisignal radio beacon system | |
US3790942A (en) | Radio beacon with a rotating cardioid radiation pattern in particular for use in landing grounds of secondary importance | |
US2535048A (en) | Communication and radio guidance system | |
GB1480506A (en) | Direction finders | |
US2509230A (en) | Beacon system | |
US3631495A (en) | Omnidirectional navigation transmission system and apparatus | |
GB1490918A (en) | Radio direction-finding receiver system | |
US3321760A (en) | Modified loran-c precision navigation system with communications capability | |
US3181142A (en) | Air radio navigation control systems | |
US3587099A (en) | Sector radio beacon | |
GB1276308A (en) | Receiver for use with a direction finding or radar receiving system | |
GB641809A (en) | Radio range beacon | |
US2603776A (en) | Radio beacon for indicating bearing on vehicles | |
US3099006A (en) | Navigation system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |