GB722858A - Improvements in or relating to radar display systems - Google Patents
Improvements in or relating to radar display systemsInfo
- Publication number
- GB722858A GB722858A GB2513052A GB2513052A GB722858A GB 722858 A GB722858 A GB 722858A GB 2513052 A GB2513052 A GB 2513052A GB 2513052 A GB2513052 A GB 2513052A GB 722858 A GB722858 A GB 722858A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- scanned
- filters
- cathode
- gates
- 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
- 239000013078 crystal Substances 0.000 abstract 4
- 230000035559 beat frequency Effects 0.000 abstract 3
- 230000003287 optical effect Effects 0.000 abstract 2
- 230000001360 synchronised effect Effects 0.000 abstract 2
- MVDSFPIEJILRME-UHFFFAOYSA-N 2-amino-2-(4-sulfophenyl)propanoic acid Chemical compound OC(=O)C(N)(C)C1=CC=C(S(O)(=O)=O)C=C1 MVDSFPIEJILRME-UHFFFAOYSA-N 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
- H04N3/34—Elemental scanning area oscillated rapidly in direction transverse to main scanning direction
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
722,858. Radar. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 15, 1953 [Oct. 7, 1952], No. 25130/52. Class 40 (7). [Also in Group XL (b)] Relates to radar systems in which a large volume of space is floodlit by the transmitter and the receiver comprises a rectangular array of receiving elements located in the focal plane of a directional device, e.g. a lens, the azimuth and elevation of reflecting objects being displayed on a cathode-ray tube by intensity modulation of a rectangular raster. According to the present invention, the receiving elements are connected to the grid of the display tube via individual gates which are opened sequentially by the pulse outputs from a corresponding array of photo-cells which are scanned by a light beam or spot synchronously with the display raster. The invention is applicable to pulse or unmodulated C.W. systems and it is described as applied to unmodulated C.W. Doppler systems in which the receiving elements comprise a 5 x 5 square array of crystal mixers in which the received waves are heterodyned with the transmitted waves to give Doppler beat frequencies. In some of the embodiments the beat frequencies are applied via band-pass filters to differently-coloured cathode-ray tube displays indicating responses due to targets of different radial velocity. In all the embodiments, the columns of the photo-cell array MPT, Fig. 2 (not shown), are scanned in sequence, each column being scanned successively ten times before the next column is scanned. In the embodiment described with reference to Figs. 1-7, the scanning light spot is produced by a light source LS, Fig. 5, and optical system CL, PM in conjunction with a motor-driven apertured drum AD shown in developed form in Fig. 3. The number of lines in the rectangular display raster is equal to the total number of apertures in the drum, i.e. 500, and the raster is synchronized with the drum by line and frame pulses generated by a toothed wheel, Fig. 4 (not shown), driven by the motor so that the signal from any one crystal is displayed on a corresponding rectangular element of the complete raster, the form of the intensity modulation being indicative of the beat frequency and hence of the radial velocity of the target. In Fig. 8 the light spot scanning device comprises a cathode-ray tube LCRT, with the array of photo-cells MPT mounted on the screen, the line and frame deflecting waveform from LPG and SFPG being respectively sawtooth and stepped so that the photo-cells are scanned as in the previous embodiment. The gating pulses from the photo-cells are applied via amplifiers GA1 ... GA25 (GA1 and GA2 only shown) to gates G1 ... G25 and the crystal mixers XI ... X25 are connected in parallel via the respective gates and a common amplifier PRA to three filters F1 ... F3 having pass-bands of 0-600, 600-1200 and 1200- 2000 c/s. respectively, the outputs from the filters being applied via amplifiers FA1 ... FA3 to the grids of three cathode-ray tubes DTR, DTB and DTG which have red, blue and green filters LFR, LFB and LFG respectively and which are scanned in synchronism with the photo-cell scan by conventional saw-tooth line and frame deflecting waveforms from generators LPG and FPG synchronized by a master generator MSPG. The tubes may be viewed separately but a better discrimination between discrete targets and clutter is obtained by viewing them in optical superimposition through half-silvered mirrors MM1 and MM2; alternatively the tubes may have coloured phosphors or a single three-colour tube may be employed. In a modification, Fig. 9 (not shown), the filters precede the gates, three filters and three gates being provided for each crystal which is separately coupled to each of the three tubes via a corresponding filter and gate. Fig. 10 (not shown) illustrates the use of the cathode-ray tube light spot scan of Fig. 8 in conjunction with a single monochrome display.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2513052A GB722858A (en) | 1952-10-07 | 1952-10-07 | Improvements in or relating to radar display systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2513052A GB722858A (en) | 1952-10-07 | 1952-10-07 | Improvements in or relating to radar display systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB722858A true GB722858A (en) | 1955-02-02 |
Family
ID=10222684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2513052A Expired GB722858A (en) | 1952-10-07 | 1952-10-07 | Improvements in or relating to radar display systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB722858A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3307142A (en) * | 1964-06-10 | 1967-02-28 | Harold J Doebler | Three-color echo ranging display |
-
1952
- 1952-10-07 GB GB2513052A patent/GB722858A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3307142A (en) * | 1964-06-10 | 1967-02-28 | Harold J Doebler | Three-color echo ranging display |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3055258A (en) | Bragg diffraction ultrasonic devices | |
US3918025A (en) | Ultrasonic imaging apparatus for three-dimensional image display | |
US2412669A (en) | Pulse-echo position indicator | |
US3292018A (en) | Transducers | |
US3953825A (en) | Electronically focused imaging system and method | |
US2602836A (en) | Instantaneous frequency analyzer | |
US2458649A (en) | Color television | |
GB617592A (en) | Improvements in or relating to the detection or viewing of objects by the use of reflected waves | |
US2547945A (en) | System for conveying traffic data to aircraft | |
US3184679A (en) | Multi-phase signal processor for light line optical correlator | |
US3603919A (en) | Poly-panchromatic target identification | |
US3526893A (en) | Optical correlation system for received radar signals in pseudo-randomly coded radar systems | |
GB722858A (en) | Improvements in or relating to radar display systems | |
US2859652A (en) | Wide-angle, energy responsive scanning system | |
US3160881A (en) | Method of simultaneously displaying at least two pictures on the screen of a cathode-ray tube | |
US3024441A (en) | Sector scan indicator | |
US3953851A (en) | Device for a radio station comprising a jammer | |
US4060791A (en) | Imaging system | |
GB720554A (en) | Improvements in and relating to colour television apparatus | |
US3342937A (en) | Synchronizing of electron beam scanning in a narrow bandwidth pseudorandom dot scan television system | |
US3571507A (en) | Optical apparatus for developing display information signals of frequency multiplex character | |
US2480837A (en) | Scanning device for cathode-ray oscillographs | |
US2768323A (en) | Means for increasing the area of good definition in a p. p. i. display | |
GB1183374A (en) | Improvements in or relating to Infra-red Viewing Systems | |
US3787609A (en) | Electronic color filter system |