GB1483077A - Apparatus for determining the attitude of a satellite in geostationary orbit - Google Patents
Apparatus for determining the attitude of a satellite in geostationary orbitInfo
- Publication number
- GB1483077A GB1483077A GB4260574A GB4260574A GB1483077A GB 1483077 A GB1483077 A GB 1483077A GB 4260574 A GB4260574 A GB 4260574A GB 4260574 A GB4260574 A GB 4260574A GB 1483077 A GB1483077 A GB 1483077A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bolometer
- aperture
- earth
- mirror
- plate
- 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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/782—Systems for determining direction or deviation from predetermined direction
- G01S3/789—Systems for determining direction or deviation from predetermined direction using rotating or oscillating beam systems, e.g. using mirrors, prisms
-
- 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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/782—Systems for determining direction or deviation from predetermined direction
- G01S3/785—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system
- G01S3/786—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system the desired condition being maintained automatically
- G01S3/7868—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system the desired condition being maintained automatically using horizon sensors
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Navigation (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
1483077 Horizon sensor PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 1 Oct 1974 [4 Oct 1973] 42605/74 Heading H4D In an horizon sensor for a geostationary satellite to sense its attitude relative to the earth an image I of the earth and the surrounding space is focused (lens 1) on to a plate P (n.b. Fig. 1 shows a sectional view and a "rear" plane view of the plate P). Positioned in the plate P on the "North South" and "East West" axes are four sets of horizon sensors each comprising, Fig. 2, an open square shaped aperture 231, a grating aperture 232 and two bolometers positioned behind slits 234, 233 (see also Fig. 4, not shown). Each set has a concave mirror not shown associated with it that is placed behind the plate P relative to the lens 1. The principal axis of each mirror (when stationary) passes through the centre "0" of its corresponding set. The radius of curvature of each mirror is such that the image of the aperture 231 is focused on the bolometer slit 233's plane and the image of grating aperture 232 is focused on the bolometer slit 234's plane. Each mirror is caused to rotate about an axis through a fixed predetermined angle so that the two images move up and down across the slits 233 or 234 in the North-South or East-West direction (depending on the set concerned). The output of the bolometer 233 consists Fig. 6 of a series of inverted pulses 62 whose duration PM or NS is proportional to the position of each space transition in the aperture 231 (under ideal conditions the earth-space transition is central). The output of the bolometer 234 is a sawtooth output 67. The two outputs are processed by a logic circuit (Fig. 5b, not shown) containing filters, threshold circuits and flip-flops. The logic circuit is such that the sawtooth signals of bolometer 234 are gated out during the square wave pulses 62, thereby providing a digital indication 68 of the position of the earth-space transition.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7335430A FR2246843B1 (en) | 1973-10-04 | 1973-10-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1483077A true GB1483077A (en) | 1977-08-17 |
Family
ID=9125901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4260574A Expired GB1483077A (en) | 1973-10-04 | 1974-10-01 | Apparatus for determining the attitude of a satellite in geostationary orbit |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5065255A (en) |
| DE (1) | DE2446966A1 (en) |
| FR (1) | FR2246843B1 (en) |
| GB (1) | GB1483077A (en) |
| IT (1) | IT1022577B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2630705B1 (en) * | 1988-04-28 | 1990-08-24 | Rhone Poulenc Sa | METHOD FOR SCANNING OBSERVATION OF A CELESTIAL BODY AND MEASUREMENT OF AN ANGULAR SPEED OF A SPATIAL VEHICLE, OBSERVATION SYSTEM FOR ITS IMPLEMENTATION, AND SPATIAL VEHICLE COMPRISING SAME |
-
1973
- 1973-10-04 FR FR7335430A patent/FR2246843B1/fr not_active Expired
-
1974
- 1974-10-01 GB GB4260574A patent/GB1483077A/en not_active Expired
- 1974-10-02 IT IT2802974A patent/IT1022577B/en active
- 1974-10-02 DE DE19742446966 patent/DE2446966A1/en not_active Withdrawn
- 1974-10-04 JP JP11395474A patent/JPS5065255A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5065255A (en) | 1975-06-02 |
| FR2246843A1 (en) | 1975-05-02 |
| IT1022577B (en) | 1978-04-20 |
| FR2246843B1 (en) | 1976-05-14 |
| DE2446966A1 (en) | 1975-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |