GB604445A - Radio communication and guiding system for mobile units - Google Patents

Radio communication and guiding system for mobile units

Info

Publication number
GB604445A
GB604445A GB10724/45A GB1072445A GB604445A GB 604445 A GB604445 A GB 604445A GB 10724/45 A GB10724/45 A GB 10724/45A GB 1072445 A GB1072445 A GB 1072445A GB 604445 A GB604445 A GB 604445A
Authority
GB
United Kingdom
Prior art keywords
channel
aircraft
course
channels
pulse
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
Application number
GB10724/45A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB604445A publication Critical patent/GB604445A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/155Ground-based stations
    • H04B7/17Ground-based stations employing pulse modulation, e.g. pulse code modulation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S1/00Beacons 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
    • G01S1/02Beacons 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

Abstract

604,445. Radio navigation; radio signalling. STANDARD TELEPHONES & CABLES, Ltd. April 27, 1945, No. 10724. Convention date, May 5, 1944. [Classes 40 (v) and 40 (vii)] In a system for guiding a mobile unit, e.g. an aircraft, along a course line defined by a plurality of equi-signal course beacons, successive. beacons along the course transmit on frequencies F1, F2, F1, F2, &c. and a marker beacon transmitting at the same frequency as one of a pair of adjacent course beacons is located in the region of overlap of the directive patterns from the adjacent course beacons, the purpose of the marker beacon being to switch over the tuning of the receiver on the mobile unit from F1 to F2 or vice versa as the mobile unit moves out of the predominating field of one course beacon into the predominating field of the adjacent beacon. The system is described as combined with an intercalated pulse multiplex repeater system similar to that described in Specification 604,203 for communication between terminals of the course and between one control terminal and the aircraft via broadcast transmitters, the repeaters and broadcast transmitters being mounted on the same towers as the beacons. One channel of the communication system may be used for switching on the beacons and broadcast transmitters and this operation may also be effected by signals transmitted from the aircraft. Course and marker beacons. Each course beacon 26, Fig. 1, which may be of the doubletone or keyed A-N type is mounted on a tower and is provided with an angular reflector 26A, to produce unidirectional radiation patterns 225, 226, 227 ... shown in elevation and plan in Figs. 5 and 6, the patterns being radiated at frequencies F1, F2, F1 ... and extending eastwards along the course. The horizontal portion of the reflector 26A, Fig. 3 (not shown), also serves as an artificial earth. Marker beacons 25 are mounted on top of the towers, the beacons having vertical fan-shaped radiation patterns 230, 231 ... inclined slightly in the forward (eastward) direction and each marker beacon transmitting at the frequency of the preceding coursebeacon. In the aircraft receiver, Fig. 4 (not shown), the received signals of frequencies F1 and F2 are separated and fed into amplifying channels with crossconnected A.V.C. circuits so that only the signal due to the predominating frequency appears at the output and the purpose of the marker beacon radiation is to make the transition in field strength more abrupt so that the changeover takes place at substantially the same point irrespective of the direction of flight along the course. In a modification, Fig. 15 and Fig. 16 (not shown), each marker beacon transmits at the same frequency as the adjacent course beacon, but it radiates two fan-shaped patterns 600, 602 slightly displaced along the course, the one displaced in the direction of an F2 zone being, modulated at 900 c/s. and the one displaced in the direction of an F1 zone being modulated at 500 c/s. In the modified aircraft receiver, Fig. 17 (not shown), the 900 and 500 c/s. are separated from the output of a broadly tuned detector capable of receiving F1 and F2 and applied to operate separate relays which tune a sharply tuned detector to F2 and F1 respectively; thus on passing from an F2 zone to an F1 zone, the 500 c/s. tone switches the tuning to F and on passing from an F1 zone to an F2 zone the 900 c/s. tone switches the tuning to F2. Communication system. The pulse multiplex transmission is transmitted and repeated eastwards by the directive aerials 21, 22, Fig. 1, on successive frequencies F1, F2, F1 ... and the westbound transmission takes place on aerials 21A and 22A on successive frequencies of F4, F3, F4 .... The odd numbered eastbound channels from the West terminal control station are selected at each tower and broadcast to aircraft from a wide angle aerial 23 on the same frequency as the eastbound relay from that tower, the transmission from the aircraft being received on a wide angle aerial 24 at a frequency F5 and then inserted in appropriate odd numbered westbound channels. A system of push-pull time displacement modulation of adjacent pulse pairs is described, Fig. 8 (not shown), of the type disclosed in Specification -600,244, but other types of pulse modulation, e.g. amplitude modulation, could be used; the first channel is given a distinctive pulse width and is used as a synchronizing and order channel. At the control (west) terminal station the separation of the outgoing channels is controlled by a base wave generator which is fed through individual phase shifters to each modulator and the incoming channels are separated by selecting the synchronizing pulses by width discrimination and feeding them through individual delay circuits to channel gating circuits, a similar system being used at the repeater stations, Fig. 3B (not shown), for selecting the odd channels for transmission to the aircraft. The signals received at the aircraft comprise intelligence pulses 216, Fig. 4A (not shown), superposed on the course beacon modulation frequency 215 and these are separated in the receiver, Fig. 4 (not shown), by limiting and filtering; the order channel pulses are selected by width discrimination and fed through a demodulator to a standby earphone, the selected pulses being also fed through a variable delay circuit to a channel gating circuit for selecting another channel which is fed to a communication earphone. In communicating with an aircraft, the control station calls it up on the order channel and instructs it to select a particular communication channel. The time displacement modulated pulse channels transmitted by the aircraft are distinguished by their pulse widths and each aircraft transmits two channels controlled by a base wave generator which may be synchronized by the received order pulses, one of the channels having a particular pulse width corresponding to the order channel and the other having a selectable pulse width corresponding to the communication channel in use. These transmissions are separated by pulse width discrimination at the repeater stations, Fig. 3B (not shown), and injected into corresponding westbound transmissions under the control of synchronizing pulses separated from the incoming westbound repeater transmission. In a modification, Figs. 12-14 (not shown), all the channel pulses are the same width and a synchronizing frequency which is a subharmonic of the pulse recurrence frequency is injected into the first channel modulator. The channels are separated by a system similar to that described in Specifications 600,252 and 604,203, channel pulses being fed to a channel gating selector controlled by an oscillator running at a slightly lower frequency than the repetition frequency of each channel pulse train so that each channel is selected in turn and when the first channel is received the synchronizing frequency is filtered out and applied to lock the oscillator, the output from which is also fed through individual phase shifters to channel gating selectors. The different channels from the aircraft are amplitude modulated on to different sub-carriers of a common carrier F5 and at the towers these channels are separated by filters and injected into westbound pulse channels under the control of a base wave generator synchronized with the westbound channel separating oscillator. Control of tower transmitters. In the modification shown in Figs. 12-14 a switching pulse channel of particular pulse width is transmitted by the control station and this is selected at the relay towers and applied through a demodulator to trigger a thyratron which switches on the course beacon, marker beacon and broadcast transmitters. The thyratron may also be triggered by the rectified carrier of the received aircraft transmissions so that an aircraft switches on the transmitters located on adjacent towers. Suitable circuits for pulse demodulation and pulse width discrimination are given in Figs. 9 and 10 (not shown), of the types described in Specifications 592,789 and 600,291 respectively. At each tower the aerials for the marker beacon and the broadcast transmitter and receiver are mounted above a shielding sheet, Fig. 3 (not shown), which also serves as an artificial earth.
GB10724/45A 1944-05-05 1945-04-27 Radio communication and guiding system for mobile units Expired GB604445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US534284A US2421017A (en) 1944-05-05 1944-05-05 Communication and guiding system

Publications (1)

Publication Number Publication Date
GB604445A true GB604445A (en) 1948-07-05

Family

ID=24129435

Family Applications (2)

Application Number Title Priority Date Filing Date
GB10724/45A Expired GB604445A (en) 1944-05-05 1945-04-27 Radio communication and guiding system for mobile units
GB7814/47A Expired GB625478A (en) 1944-05-05 1947-03-21 Improvements in or relating to multichannel radio systems for communication with moving vehicles

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB7814/47A Expired GB625478A (en) 1944-05-05 1947-03-21 Improvements in or relating to multichannel radio systems for communication with moving vehicles

Country Status (5)

Country Link
US (1) US2421017A (en)
BE (3) BE477481A (en)
CH (2) CH283937A (en)
ES (1) ES178737A1 (en)
GB (2) GB604445A (en)

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GB587351A (en) * 1943-09-15 1947-04-23 Frederick Calland Williams Improvements in or relating to radio navigation systems
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US2471416A (en) * 1944-05-05 1949-05-31 Standard Telephones Cables Ltd Radio communicating system
BE474059A (en) * 1944-08-25
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2523295A (en) * 1945-06-07 1950-09-26 Farnsworth Res Corp Airways navigational system
US2531393A (en) * 1945-06-08 1950-11-28 Burnight T Robert Electronic coordinating system
US2523748A (en) * 1946-01-29 1950-09-26 Bell Telephone Labor Inc Carrier telegraph system
BE471236A (en) * 1946-02-15
US2481516A (en) * 1946-03-22 1949-09-13 Lance R Jacobsen Mobile telephone system
US2535107A (en) * 1946-04-19 1950-12-26 Panoramic Radio Corp Navigational system
US2672607A (en) * 1946-06-10 1954-03-16 Jr James H Mulligan System for suppressing unwanted recognition signals
US2649540A (en) * 1946-07-08 1953-08-18 John H Homrighous Multiplex radiophone communication system
US2637022A (en) * 1947-01-16 1953-04-28 Radio Industrie Sa Communication system between two stations linked by television
NL139323B (en) * 1947-03-19 Ici Ltd METHOD FOR POLYMERIZING ALKINES-1.
US2525815A (en) * 1947-03-20 1950-10-17 Raymond G Lloyd System of radio aids for aerial navigation
US2608684A (en) * 1947-03-29 1952-08-26 Standard Telephones Cables Ltd Radio navigation system
US2579591A (en) * 1947-04-19 1951-12-25 Westinghouse Electric Corp Relay system
US2588930A (en) * 1947-04-22 1952-03-11 Gen Railway Signal Co Airway traffic control system
US2588916A (en) * 1948-02-02 1952-03-11 Gen Railway Signal Co Navigational system for airways traffic control
US2623208A (en) * 1947-06-16 1952-12-23 Wallace Traffic control system
US2524776A (en) * 1947-07-02 1950-10-10 Standard Telephones Cables Ltd Pulse time modulation repeater system
US2631194A (en) * 1947-07-22 1953-03-10 Int Standard Electric Corp Telecommunication system
US2490061A (en) * 1947-07-31 1949-12-06 United Air Lines Inc Radio-wire communication system
US2636166A (en) * 1947-09-10 1953-04-21 Rca Corp Bearing deviation indication system
US2502317A (en) * 1947-09-30 1950-03-28 Rca Corp Radio navigation
US2534844A (en) * 1947-11-26 1950-12-19 Panoramic Radio Corp Gated triple synchrometric system
US2666198A (en) * 1948-03-15 1954-01-12 Wallace Synchrometric radar system
US2980903A (en) * 1948-03-19 1961-04-18 Goodyear Aircraft Corp Radar-command system of time coded pulses
US2572235A (en) * 1948-03-30 1951-10-23 Bell Telephone Labor Inc Multichannel intermodulation interference reduction radio communication system
US2514436A (en) * 1948-06-18 1950-07-11 Luis W Alvarez Airway monitoring and control system
GB651604A (en) * 1948-09-09
US2642524A (en) * 1948-11-04 1953-06-16 Gen Electric Co Ltd Radio communication system
US2781509A (en) * 1948-11-30 1957-02-12 Rca Corp Side-lobe rejection circuit for pulse radar system
US2800651A (en) * 1948-11-30 1957-07-23 Rca Corp Radio beacon
US2678437A (en) * 1949-04-27 1954-05-11 Gen Railway Signal Co Air traffic control system
US2571386A (en) * 1949-09-16 1951-10-16 Rca Corp Early warning relay system
US2918532A (en) * 1955-02-25 1959-12-22 Itt Multiplex transmission system
USRE24590E (en) * 1952-04-07 1959-01-20 parker
US2887659A (en) * 1955-07-26 1959-05-19 Bendix Aviat Corp Signal network
US2904674A (en) * 1956-11-29 1959-09-15 Bell Telephone Labor Inc Radiant energy highway communication system with controlled directive antenna
US3539924A (en) * 1967-10-12 1970-11-10 Bell Telephone Labor Inc Zoned mobile radio telephone system
JPH0530000A (en) * 1991-07-18 1993-02-05 Fujitsu Ltd Mobile body communication system
US7973730B2 (en) * 2006-12-29 2011-07-05 Broadcom Corporation Adjustable integrated circuit antenna structure

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US2322225A (en) * 1939-07-29 1943-06-22 Carl J Crane Aircraft automatic take-off, flight, and landing

Also Published As

Publication number Publication date
BE474663A (en)
ES178737A1 (en) 1947-09-01
CH281168A (en) 1952-02-29
GB625478A (en) 1949-06-28
US2421017A (en) 1947-05-27
BE477481A (en)
CH283937A (en) 1952-06-30
BE482468A (en)

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