GB885923A - An aircraft radio navigation system - Google Patents
An aircraft radio navigation systemInfo
- Publication number
- GB885923A GB885923A GB17338/58A GB1733858A GB885923A GB 885923 A GB885923 A GB 885923A GB 17338/58 A GB17338/58 A GB 17338/58A GB 1733858 A GB1733858 A GB 1733858A GB 885923 A GB885923 A GB 885923A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aircraft
- frequency
- airport
- radio
- transmitter
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
- G01S13/84—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted for distance determination by phase measurement
Abstract
885,923. Air traffic supervision. TELEFUNKEN G.m.b.H. May 30, 1958 [June 5, 1957; Aug. 22, 1957], No. 17333/58. Class 118. [Also in Group XL (c)] An aircraft radio navigation system comprises (1) at the airport control station a transmitter 10 radiating on a continuous carrier frequency fo adapted to be modulated by selective calling frequencies s1, s 2 &c. and by a single distancemeasuring frequency r; (2) on the aircraft, means responsive to a selective calling frequency to establish radio-telephone communication with the airport, and a transmitter radiating on a carrier frequency f which is modulated by the received and demodulated distance-measuring signal; and (3) at the airport control station, means for measuring the phase displacement between the demodulated distance-measuring signal and the transmitted distance-measuring frequency. In the system described control station B transmitter 10 includes audio-frequency r generator 12 and rows 32, 33 of keys for additional modulation with selected calling frequencies s 1 . . . , t 1 . . . respectively. Each co-operating aircraft carries a receiver 24 tuned to frequency f o and the demodulated signal at frequency r is modulated on to transmitter 25 having a carrier frequency fn individual to each aircraft. At the airport receivers such as 16, individual to each of the carriers fn, are provided and the demodulated tone r feeds an automatic phase shifter 14 controlled by a voltage derived from bridge network 13; the phase shifter is calibrated in distance, and the speed at which the aircraft approaches the airport along lane L is given by the rate of change of measured distance. The aircraft also carries a pulse radar relay comprising receiver 27, a transmitter 28 radiating at the radar frequency and means which delay the received radar pulse and re-transmits the delayed pulse followed by additional pulses; the radar relay is energized only when an appropriate call frequency tn is received on carrier fo. For radio-telephony between aircraft and airport, the aircraft may transmit on frequency fn and the airport on frequency fo. The aircraft may also transmit to the airport by radio-telegraphy its estimated time of arrival, ground speed, air speed, course and altitude. Each selective calling frequency may be replaced by several frequencies transmitted simultaneously or successively. In a modification, to economize in the number of frequencies fn, the aircraft transmitters 25 are switched on and off after calling by time-delay relays, e.g. 5 seconds on and 55 seconds off. Airport indicators, Figs. 1 and 2.-An indicator board, Fig. 1, for a traffic operator is divided into columns 1 ... 9, one for each aircraft, and into rows representing distance from the airport ; individual aircraft are represented by projected light-spots. The lower section of the board contains rows in which the frequencies fn are entered, an appropriate red light ensues when an aircraft wishes to transmit a message, the time of arrival AZ is entered as estimated from aircraft ground speed and range, and the course, altitude &c. data transmitted by the aircraft is entered. To show lateral aircraft separation a plan position indicator (P.P.I.), Fig. 2, of the air lane is provided and the same data as in the lower part of Fig. 1 is given to the radar operator, who has an additional row of keys for interrogating a selected aircraft. Locking means are provided to prevent simultaneous use of the radio-telephony channel by the operators. Additional radio navigation facilities.-The system may include a revolving radio beacon transmitter at the airport with corresponding apparatus in the aircraft to determine the deviation from a prescribed course and to report such deviation to the airport on frequency fn ; this information is shown on an additional row on the indicator boards. Alternatively a radio direction finder may be provided at the airport, capable of being switched at will to any aircraft frequency fn. Ground-to-air instructions may be transmitted to the aircraft by television, the image being projected on to the pilot's windscreen; or signals may be transmitted to automatically bring the aircraft on to a prescribed course. For blind landing, ground-controlled approach data may be transmitted to the selected aircraft or may be used to provide radio-controlled aircraft guidance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE885923X | 1957-06-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB885923A true GB885923A (en) | 1962-01-03 |
Family
ID=6833057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17338/58A Expired GB885923A (en) | 1957-06-05 | 1958-05-30 | An aircraft radio navigation system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB885923A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2134678A1 (en) * | 1970-07-17 | 1972-02-24 | Christian Huygens Lab Nv | Secondary radar system |
WO1980001030A1 (en) * | 1978-11-09 | 1980-05-15 | Western Electric Co | Mobile radiotelephone station two-way ranging system |
RU2776028C1 (en) * | 2021-12-06 | 2022-07-12 | Акционерное общество "Челябинский Радиозавод "Полет" | Repeater of range finder of landing radio beacon group |
-
1958
- 1958-05-30 GB GB17338/58A patent/GB885923A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2134678A1 (en) * | 1970-07-17 | 1972-02-24 | Christian Huygens Lab Nv | Secondary radar system |
WO1980001030A1 (en) * | 1978-11-09 | 1980-05-15 | Western Electric Co | Mobile radiotelephone station two-way ranging system |
EP0020606A1 (en) * | 1978-11-09 | 1981-01-07 | Western Electric Co | A system for the communication of radio signals. |
EP0020606A4 (en) * | 1978-11-09 | 1981-03-13 | Western Electric Co | A system for the communication of radio signals. |
RU2776028C1 (en) * | 2021-12-06 | 2022-07-12 | Акционерное общество "Челябинский Радиозавод "Полет" | Repeater of range finder of landing radio beacon group |
RU2786058C1 (en) * | 2022-07-12 | 2022-12-16 | Акционерное общество "Ордена Трудового Красного Знамени Всероссийский научно-исследовательский институт радиоаппаратуры" (АО "ВНИИРА") | Rangefinder repeater of the landing radio beacon group with a data transmission channel |
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