GB1480474A - Guidance systems - Google Patents
Guidance systemsInfo
- Publication number
- GB1480474A GB1480474A GB29391/74A GB2939174A GB1480474A GB 1480474 A GB1480474 A GB 1480474A GB 29391/74 A GB29391/74 A GB 29391/74A GB 2939174 A GB2939174 A GB 2939174A GB 1480474 A GB1480474 A GB 1480474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- course
- modulation
- angular
- boat
- drum
- 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
- G01S1/44—Rotating or oscillating beam beacons defining directions in the plane of rotation or oscillation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
1480474 Guidance systems SOC DE FABRICATION D'INSTRUMENTS DE MESURE 2 July 1974 [3 July 1973 21 Jan 1974] 29391/74 Heading H4D In a guidance system a pencil beam of radiation is oscillated in a plane on either side of a mean position according to a predetermined oscillation programme, and the beam energy is modulated as a function of the angular position of the beam with respect to the mean position, the modulator comprising a rotating member having opaque and transparent regions which intersect the beam. As described, the beam from a laser 1, Fig. 1, passes through a polarizer 17, and is deflected by a mirror 2 which is oscillated about an axis 18 by a mechanism 3,4 receiving control signals from a programmer 5. In an alternative arrangement the beam is oscillated by means of a diasporameter, comprising two contra-rotating prisms (Fig. 7, not shown). The beam, which is oscillating in a plane perpendicular to the axis 18, then passes through a disc 6, which is parallel to said axis, and which is revolved at constant speed by a motor 7. The disc 6 comprises concentric circular paths 20, each comprising alternate lighttransmitting and light-obscuring portions which impose a modulation upon the beam which is dependent upon its angular deflection from a mean position. After passing through the modulation disc 6, the beam is widened in a plane containing the axis 18 by an annular anamorphoser 11. Said anamorphoser may be straight if the angular movement of the beam is small, or it may be arranged to oscillate with the mirror 2, when its width may be reduced. As applied to the guidance of a boat, in a narrow central region the modulation frequency indicates "on course", and in one or more regions on each side, the modulation frequencies indicate that the boat is to the left or to the right of the course line. On the boat are a diode or photomultiplier, modulation frequency filters, and visual or sound indicators. A pair of photodetectors 11, 11<SP>1</SP>, Fig. 5, may be spaced across the boat. The detector 11 has filters 12 for the modulation frequencies a, b corresponding to angular displacement to one side of the "on course" area, with associated indicators 13, whilst the detector 11<SP>1</SP> has filters 12<SP>1</SP> for the modulation frequencies d, e corresponding to angular displacement to the other side of the "on course" area, with associated indicators 13<SP>1</SP>. Each detector also has a filter for the "on course" modulation frequency c, and in order to obtain an accurate indication of the course line the amplitudes of the outputs of these are compared in a comparator 26 having an associated indicator 27. The vessel may be provided with an integrating ship's log 28 giving the distance from the transmitter. This enables the angular deviations corresponding to the signals from the comparator 26 to be converted into linear deviation signals, which can be utilized to control a mechanical device 30 for adjusting the spacing between the detectors 11, 11<SP>1</SP>. In other embodiments, the modulator is a rotating drum 45, Fig. 8, inside which is the oscillating beam producing means 47, said beam being swept along one generatrix 46 of said drum. Two paths 48, 49 are provided, the respective blocking-out regions 50, 51 of which may correspond to respective modulation frequencies which are either multiples of each other (Fig. 9, not shown) or are relatively prime (Fig. 10, not shown). In the central ("on course") region they may overlap (Fig. 11, not shown), and in another arrangement they are separated by a zig-zag line, as shown in Fig. 12. The receiving apparatus has two channels, one for each modulation frequency, with respective indicators, both of which are operated when "on course" (Fig. 15, not shown). An additional wall may be provided on the modulating drum to provide superimposed low-frequency Morse code signals A (dot-dash) and N (dash-dot) on respective sides of the course line (Figs. 13, 14, not shown). These may be separated out at the receiving apparatus and be applied to an audio indicator (Fig. 16, not shown). A receiving apparatus for specific use with a transmitter having a modulating drum of the kind shown in Fig. 12 is also described (Fig. 17, not shown).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7324352A FR2262310B1 (en) | 1973-07-03 | 1973-07-03 | |
FR7401909A FR2258635B2 (en) | 1973-07-03 | 1974-01-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1480474A true GB1480474A (en) | 1977-07-20 |
Family
ID=26217815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29391/74A Expired GB1480474A (en) | 1973-07-03 | 1974-07-02 | Guidance systems |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2432004A1 (en) |
FR (2) | FR2262310B1 (en) |
GB (1) | GB1480474A (en) |
SE (1) | SE400387B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2300987A (en) * | 1979-01-30 | 1996-11-20 | Martin Marietta Corp | Beamrider guidance system using digital phase modulation encoding |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4415419A1 (en) * | 1994-05-02 | 1995-11-09 | Horn Wolfgang | Precision position measurement appts. for robotic container high-lift truck |
RU2462731C1 (en) * | 2011-02-22 | 2012-09-27 | Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" | Scanning laser beacon for spacecraft |
RU2462732C1 (en) * | 2011-02-22 | 2012-09-27 | Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" | Scanning laser beacon for spacecraft |
-
1973
- 1973-07-03 FR FR7324352A patent/FR2262310B1/fr not_active Expired
-
1974
- 1974-01-21 FR FR7401909A patent/FR2258635B2/fr not_active Expired
- 1974-06-27 SE SE7408481A patent/SE400387B/en unknown
- 1974-07-02 GB GB29391/74A patent/GB1480474A/en not_active Expired
- 1974-07-03 DE DE2432004A patent/DE2432004A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2300987A (en) * | 1979-01-30 | 1996-11-20 | Martin Marietta Corp | Beamrider guidance system using digital phase modulation encoding |
GB2300987B (en) * | 1979-01-30 | 1997-03-19 | Martin Marietta Corp | Spatially encoding a beam of electromagnetic radiation |
Also Published As
Publication number | Publication date |
---|---|
FR2262310A1 (en) | 1975-09-19 |
SE7408481L (en) | 1975-01-07 |
DE2432004A1 (en) | 1975-01-23 |
FR2262310B1 (en) | 1978-05-26 |
FR2258635B2 (en) | 1980-08-01 |
SE400387B (en) | 1978-03-20 |
FR2258635A2 (en) | 1975-08-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |