GB642399A - Improvements in or relating to radio navigation systems - Google Patents
Improvements in or relating to radio navigation systemsInfo
- Publication number
- GB642399A GB642399A GB1663549A GB1663549A GB642399A GB 642399 A GB642399 A GB 642399A GB 1663549 A GB1663549 A GB 1663549A GB 1663549 A GB1663549 A GB 1663549A GB 642399 A GB642399 A GB 642399A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- signals
- frequency
- relays
- period
- 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
- G01S1/08—Systems for determining direction or position line
- G01S1/20—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
- G01S1/30—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems the synchronised signals being continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference
-
- 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)
- Eye Examination Apparatus (AREA)
- Radar Systems Or Details Thereof (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Manipulation Of Pulses (AREA)
Abstract
642,399. Radio navigation; valve relay circuits. O'BRIEN, W. J.' Aug. 21, 1946, No. 16635/49. Divided out of 642,368. [A Specification was laid open to inspection under Sect. 91 of the Acts, Feb. 28, 1947.] [Classes 40 (vi) and 40 (vii)] A radio navigation system comprises three spaced antennµ, one of which transmits a continuous radiation of a given frequency whilst the other two are each arranged to transmit two other frequencies, the three frequencies being harmonically related and having fixed multiple phase relationships, means being provided for operating the other two antennµ alternately. The continuously radiating antenna A (Fig. 2, not shown) may be energized at 60 kc. from the master transmitter and this signal may be modulated by a low-frequency and unmodulated for equal periods, each of about 1¢ seconds. At the slave stations B and C the 60 kc. signal is received and converted in frequency to 80 and 90 kc., the output signals being maintained in constant phase relation with the 60 kc. input. The received signals from A are also fed to detectors controlling relays in the aerial circuits so arranged that the aerial circuit at B is completed when modulation occurs and that at C is completed when no modulation occurs. In a suitable receiver for such a transmission system, the received signals are separated by tuned amplifiers 29, 30 and 31. The 60 and 90 kc. signals are multiplied respectively at 131 and 32 to frequencies which when mixed and detected at 33 give a 60 kc. beat for comparison with the output of the 60 kc. amplifier 31 by discriminator 34. The output of the discriminator 34 is fed to phase indicator 35 for the AB pattern and to indicator 36 for the AC pattern by means of relays 37 and 38 controlled by device 39 which includes a detector for the 60 kc. signals. The detected pulses of low-frequency modulation are fed to the relay control circuit (Fig. 4) through resistor-capacitor network 43, 44, 45, 46 which serves to convert the square applied waveform into a quasi-sinusoidal one. This, amplified by valve 40, is applied to relay 47 which operates when the current reaches a certain value and releases before the current becomes zero and is thus operated for a period of time within and shorter than the modulation period. Contacts 47b of the relay operate to apply a square waveform somewhat longer than the unmodulated period to a similar shaping circuit, amplifier and relay 56. Owing to the delay in closing of the relay and because it drops out before the end of the applied pulse this relay is closed for periods less than, and contained by, the unmodulated signal period. Contacts of relays 47 and 56 are connected in the energization circuits of relays 37 and 38 respectively and connect the appropriate phase indicators in circuit as soon as the system has stabilized after each change over. The indicators have no restoring spring and so effectively give a continuous reading. It is pointed out that the patterns of the AB and AC contours are similar and contain 12 lanes of 360 degrees phase change for each half wavelength separation of the stations at the basic frequency of 10 kc. (of which the radiated signals are harmonics). Specifications 620,479 and 642,400 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2498746A GB642368A (en) | 1946-08-21 | 1946-08-21 | Improvements in or relating to radio navigation systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB642399A true GB642399A (en) | 1950-08-30 |
Family
ID=10220377
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1663449A Expired GB642398A (en) | 1946-08-21 | 1946-08-21 | Improvements in or relating to receiving apparatus for radio navigation systems |
GB1663549A Expired GB642399A (en) | 1946-08-21 | 1946-08-21 | Improvements in or relating to radio navigation systems |
GB2498746A Expired GB642368A (en) | 1945-08-27 | 1946-08-21 | Improvements in or relating to radio navigation systems |
GB1663649A Expired GB642400A (en) | 1946-08-21 | 1946-08-21 | Improvements in or relating to receiving apparatus for radio navigation systems |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1663449A Expired GB642398A (en) | 1946-08-21 | 1946-08-21 | Improvements in or relating to receiving apparatus for radio navigation systems |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2498746A Expired GB642368A (en) | 1945-08-27 | 1946-08-21 | Improvements in or relating to radio navigation systems |
GB1663649A Expired GB642400A (en) | 1946-08-21 | 1946-08-21 | Improvements in or relating to receiving apparatus for radio navigation systems |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE471789A (en) |
FR (1) | FR950066A (en) |
GB (4) | GB642398A (en) |
NL (3) | NL70479C (en) |
-
0
- BE BE471789D patent/BE471789A/xx unknown
- NL NL89621D patent/NL89621C/xx active
- NL NL717107661A patent/NL147239B/en unknown
- NL NL70479D patent/NL70479C/xx active
-
1946
- 1946-08-21 GB GB1663449A patent/GB642398A/en not_active Expired
- 1946-08-21 GB GB1663549A patent/GB642399A/en not_active Expired
- 1946-08-21 GB GB2498746A patent/GB642368A/en not_active Expired
- 1946-08-21 GB GB1663649A patent/GB642400A/en not_active Expired
-
1947
- 1947-07-24 FR FR950066D patent/FR950066A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL147239B (en) | |
BE471789A (en) | |
FR950066A (en) | 1949-09-16 |
NL70479C (en) | |
GB642400A (en) | 1950-08-30 |
NL89621C (en) | |
GB642368A (en) | 1950-08-30 |
GB642398A (en) | 1950-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB546284A (en) | Improvements in or relating to radio-echo distance measuring systems | |
GB642399A (en) | Improvements in or relating to radio navigation systems | |
US2477428A (en) | Communication relay station | |
US2877344A (en) | Transmitter-receiver tuning system | |
US3183441A (en) | Transponder automatic frequency control system | |
GB610534A (en) | Improvements in radio distance measuring systems | |
US3448383A (en) | Single frequency communication repeater | |
GB663709A (en) | Wave-signal communication system | |
US2736892A (en) | Echo ranging | |
US2611124A (en) | Blind landing system | |
US3009143A (en) | Doppler radar system | |
US2725556A (en) | Distance and direction indicating equipment | |
JPS5642448A (en) | Radio transmission-reception system | |
GB1305891A (en) | ||
US2545894A (en) | Noninterceptive radio communication system | |
GB1030016A (en) | Improvements in or relating to systems for relaying radio signals | |
GB958634A (en) | An ultra-short wave transmitter-receiver | |
US2811325A (en) | Course control apparatus | |
US2892189A (en) | Radio guidance system | |
US3049704A (en) | Amplitude sensitive transponder | |
GB630877A (en) | Improvements in or relating to means for identifying areas or lanes in a radio navigational system | |
GB630080A (en) | Improvements in or relating to radio navigation systems | |
GB862485A (en) | Distance measuring system utilising radiant energy | |
GB804605A (en) | Radio location system | |
SU873261A1 (en) | Device for signal transmission and receiving |