GB1233007A - - Google Patents
Info
- Publication number
- GB1233007A GB1233007A GB4876067A GB1233007DA GB1233007A GB 1233007 A GB1233007 A GB 1233007A GB 4876067 A GB4876067 A GB 4876067A GB 1233007D A GB1233007D A GB 1233007DA GB 1233007 A GB1233007 A GB 1233007A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pattern
- signals
- input signal
- forming
- image plane
- 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
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract 3
- 230000015572 biosynthetic process Effects 0.000 abstract 3
- 230000003287 optical effect Effects 0.000 abstract 3
- 238000001514 detection method Methods 0.000 abstract 1
- 239000012153 distilled water Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000010453 quartz Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
- 229920001169 thermoplastic Polymers 0.000 abstract 1
- 239000004416 thermosoftening plastic Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
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
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
- G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06E—OPTICAL COMPUTING DEVICES; COMPUTING DEVICES USING OTHER RADIATIONS WITH SIMILAR PROPERTIES
- G06E3/00—Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data
- G06E3/001—Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements
- G06E3/003—Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/88—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
Abstract
1,233,007. Optical correlation readout apparatus. MINISTER OF TECHNOLOGY. Oct. 22, 1968 [Oct.26, 1967], No.48760/67. Heading G1A. [Also in Divisions C4, G2 and H4] An optical correlation apparatus, e.g. for analysing radar, sonar or seismological signals includes, a pattern-forming means Q 1 -Q n , Fig.4, responsive to signals received at a plurality of positions A1 to An spaced apart in a circular formation for forming an input signal pattern 30 substantially representing a graphical plot of the signals, each plotted against two co-ordinates, of which one co-ordinate represents the time of reception of the signal, and the other co-ordinate represents the azimuthal bearing relative to the centre of the circular formation of the position at which the signal was received, a laser 8 to illuminate the input signal pattern 30, a first convergent-lens system 11 for forming in a reference plane 12 a pattern effectively representing a Fourier transform of the input signal pattern 30, a holographic transparency 34 located in the reference plane 12 and effectively representing a Fourier transform of a reference pattern derived from a reference input signal pattern such as would be formed by the response of the patternforming means to signals emanating from a single point source, a second convergent lens system 14 for forming in a image plane 35 a pattern effectively representing a Fourier transform of the light distribution formed in the reference plane 12 as modified by viewing through the holographic transparency 34, and detector or display means D1-Dn for facilitating observations of the pattern formed in the image plane 35, and wherein either the reference pattern or the input signal pattern is extended over an azimuthal co-ordinate range equal to at least two complete circuits of the circular formation. Preferably it is the reference pattern 34 which is so extended. The patternforming means Q 1 -Q n may be a multi-channel optical modulator, with each channel responsive to a separate one of the signal receiving positions A1-An. Such modulators may be quartz Piezoelectric transducers arranged along one edge of a multi-channel sonic light modulator cell filled, e.g. with distilled water or methylalcohol. A channel separation mark 33 is used to ensure that the output rays are those affected by only one of the acoustic waves. The acoustic waves move continuously downwardly over means 30, and the display in image plane 35 moves upwardly. The line of detection of a display spot, as it passes upward across the row of detectors D1-Dn relative to the time cycle of the transmitter of the radar system A1-An indicates e.g. the range of the target. Each detector D1-Dn detects spots resulting from targets in a range of azimuthal directions determined by its size and position in the row. The detectors may include image intensifiers and electrical outputs from then may be applied to display means which may include a computer or tracking units or both. In an alternative embodiment Fig. 1 the signals from spaced positions M1-Mn received by a scanner 1 are fed into an oscilloscope and continuously recorded on a sensitive medium 3. This recording is then made into a permanent or semi-permanent translucent pattern by any known photographic, photochromic or thermoplastic recording technique. The recording is cut into sheets each containing a complete set of all the reflections of one transmitted pulse received from a target by means M1-Mn within the surveillance area. The reference pattern 34 is formed by drawing a representation of for example, a signal pattern produced by signals from a target whose azimuthal bearing is zero. This pattern is then introduced with a hologram forming apparatus and a hologram mode, which when developed becomes the reference transparency 34. The detector or display means may be a screen located in the image plane and which is coated with a fluorescent material. Examples of suitable holographic transparency reference patterns are given.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4876067 | 1967-10-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1233007A true GB1233007A (en) | 1971-05-26 |
Family
ID=10449808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4876067A Expired GB1233007A (en) | 1967-10-26 | 1967-10-26 |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1805286A1 (en) |
GB (1) | GB1233007A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3809873A (en) * | 1971-06-28 | 1974-05-07 | C Klahr | Optical processor for convolution filtering |
US4187000A (en) * | 1975-06-16 | 1980-02-05 | Constant James N | Addressable optical computer and filter |
US4310894A (en) * | 1979-12-20 | 1982-01-12 | Honeywell Inc. | High speed ambiguity function evaluation by optical processing |
EP0058036A1 (en) * | 1981-02-09 | 1982-08-18 | Honeywell Inc. | Optical ambiguity function generator system |
GB2120492A (en) * | 1982-04-22 | 1983-11-30 | Marconi Co Ltd | Apparatus for sensing the direction of a source of radiation of unknown frequency |
GB2130039A (en) * | 1981-09-14 | 1984-05-23 | British Aerospace | Optical trackers |
US4471445A (en) * | 1981-03-30 | 1984-09-11 | Grumman Aerospace Corporation | Fourier transform signal processor |
-
1967
- 1967-10-26 GB GB4876067A patent/GB1233007A/en not_active Expired
-
1968
- 1968-10-25 DE DE19681805286 patent/DE1805286A1/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3809873A (en) * | 1971-06-28 | 1974-05-07 | C Klahr | Optical processor for convolution filtering |
US4187000A (en) * | 1975-06-16 | 1980-02-05 | Constant James N | Addressable optical computer and filter |
US4310894A (en) * | 1979-12-20 | 1982-01-12 | Honeywell Inc. | High speed ambiguity function evaluation by optical processing |
EP0058036A1 (en) * | 1981-02-09 | 1982-08-18 | Honeywell Inc. | Optical ambiguity function generator system |
US4471445A (en) * | 1981-03-30 | 1984-09-11 | Grumman Aerospace Corporation | Fourier transform signal processor |
GB2130039A (en) * | 1981-09-14 | 1984-05-23 | British Aerospace | Optical trackers |
GB2120492A (en) * | 1982-04-22 | 1983-11-30 | Marconi Co Ltd | Apparatus for sensing the direction of a source of radiation of unknown frequency |
Also Published As
Publication number | Publication date |
---|---|
DE1805286A1 (en) | 1969-07-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |