GB636408A - Improvements in and relating to radar plan position indicators - Google Patents
Improvements in and relating to radar plan position indicatorsInfo
- Publication number
- GB636408A GB636408A GB1582847A GB1582847A GB636408A GB 636408 A GB636408 A GB 636408A GB 1582847 A GB1582847 A GB 1582847A GB 1582847 A GB1582847 A GB 1582847A GB 636408 A GB636408 A GB 636408A
- Authority
- GB
- United Kingdom
- Prior art keywords
- projected
- screen
- switch
- wiping
- mirror
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7425—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/20—Cathode-ray oscilloscopes
- G01R13/202—Non-electric appliances, e.g. scales, masks
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/04—Display arrangements
- G01S7/06—Cathode-ray tube displays or other two dimensional or three-dimensional displays
- G01S7/10—Providing two-dimensional and co-ordinated display of distance and direction
- G01S7/12—Plan-position indicators, i.e. P.P.I.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
636,408. Radiolocation. SCOPHONY, Ltd., and WIKKENHAUSER, G. June 16, 1947, No. 15828. [Class 40 (vii)] In an arrangement for periodically removing the trace on a P.P.I, device of the persistent image type without interfering with the normal routine operation of the indicator two P.P.I, devices, fed from a common source of radar signals, are adapted such that the screen of either can be projected upon a projection screen. Corresponding indications on the two indicators are projected at substantially the same points on the projection screen and means are provided for wiping-off the image from that one of the devices not being projected. In the embodiment shown two tubes 10 and 10<1> of the dark-trace type are arranged so that their screens 16 and 16<1> may be projected diascopically by means of lamps 20 and 20<1> respectively, mirror 18 and lens, 21 on to the screen 22. The tube to be projected is selected by the mirror 18 which is capable of rotation through 90 degrees to the position shown dotted. This movement is preferably coupled to the switch 11 which feeds the radar signals from source 23 to the tube in use and also applies energy from 17 to the heating element of the screen not in use to wipe off a picture previously formed on that screen. Other means may be utilized for wiping-off, e.g. light of a particular wavelength, or a stream of hot air. The switch 11 may have additional contacts and brushes to switch the focussing and deflecting supplies to the tubes. Specifications 513,776 and 524,230 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1582847A GB636408A (en) | 1947-06-16 | 1947-06-16 | Improvements in and relating to radar plan position indicators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1582847A GB636408A (en) | 1947-06-16 | 1947-06-16 | Improvements in and relating to radar plan position indicators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB636408A true GB636408A (en) | 1950-04-26 |
Family
ID=10066259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1582847A Expired GB636408A (en) | 1947-06-16 | 1947-06-16 | Improvements in and relating to radar plan position indicators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB636408A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1138949B (en) * | 1957-02-09 | 1962-10-31 | Atlas Werke Ag | Device for erasable recording of events for the purpose of a coherent observation of the latest recorded content |
| DE1175896B (en) * | 1958-11-24 | 1964-08-13 | Aviation Louis Breguet Sa | Illuminated panel for the simultaneous display of a large number of fixed and / or time-changing information |
-
1947
- 1947-06-16 GB GB1582847A patent/GB636408A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1138949B (en) * | 1957-02-09 | 1962-10-31 | Atlas Werke Ag | Device for erasable recording of events for the purpose of a coherent observation of the latest recorded content |
| DE1175896B (en) * | 1958-11-24 | 1964-08-13 | Aviation Louis Breguet Sa | Illuminated panel for the simultaneous display of a large number of fixed and / or time-changing information |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB636408A (en) | Improvements in and relating to radar plan position indicators | |
| US2621555A (en) | Optical comparison projection system | |
| US3104283A (en) | Optical multiplexer | |
| JPS5322357A (en) | Beam blanking unit | |
| US2505983A (en) | Illuminating means for camera range determining devices | |
| JPS5252631A (en) | Display device in finder by led | |
| GB672661A (en) | Image projection optical system | |
| JPS5329739A (en) | Projection type display device | |
| GB620519A (en) | Improvements relating to cathode ray tubes | |
| CH266983A (en) | Device for focusing the image in an electron microscope with electrostatic lenses. | |
| GB661797A (en) | Improvements in and relating to television cameras | |
| SU134958A1 (en) | The method of determining the deviation of the copy sensor in photocopiers by the phase shift | |
| JPS5627576A (en) | Video projector unit | |
| GB671851A (en) | Improvements in or relating to apparatus for viewing and photographing a cathode raytube screen | |
| SU72846A1 (en) | Television or oscillographic device | |
| JPS55106443A (en) | Display device of camera | |
| GB623656A (en) | Improvements in and relating to apparatus for screen brightness measurement | |
| GB591785A (en) | Improvements in camera obscuras | |
| JPS5350856A (en) | Distance measuring device | |
| JPS5491356A (en) | Laser positioning device | |
| GB825684A (en) | Optical projection apparatus | |
| GB599551A (en) | Radio direction finders | |
| JPS5262048A (en) | Detection of position of target | |
| NEBBELING | Simultaneous projection of a schlieren image on a viewing screen and into a camera, using a mirror knife edge instead of the usual knife edge | |
| GB576204A (en) | Improvements in or relating to cathode ray tubes |