GB588851A - Improvements in or relating to object-locating and -detecting systems - Google Patents
Improvements in or relating to object-locating and -detecting systemsInfo
- Publication number
- GB588851A GB588851A GB96945A GB96945A GB588851A GB 588851 A GB588851 A GB 588851A GB 96945 A GB96945 A GB 96945A GB 96945 A GB96945 A GB 96945A GB 588851 A GB588851 A GB 588851A
- Authority
- GB
- United Kingdom
- Prior art keywords
- indicator
- voltage
- elevation
- time
- fed
- 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
- 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)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
588,851. Radiolocation. WATSON, D. S., and WRIGHT, C. S. Jan. 11, 1945, No. 1969. [Class 40 (v)] In a radiolocation system in which an exploring beam oscillates, in elevation, e.g. at relatively high speed, whilst rotating or oscillating in azimuth, e.g. at relatively low speed, and in which indications of range and bearing are given in a cathode-ray plan-position-indicator, the signal input to the indicator is blocked during periods when the radial displacement of the cathode ray and the angular elevation of the exploring beam correspond to heights above, or alternatively below, a selected height, or above and below a selected height-band. By this means a considerable amount of unwanted energy is eliminated which would otherwise be fed to the indicator and give rise to background. Fig. 1 is a diagram showing ranger against height h for various elevational angles # of an exploring beam emanating from A in one direction in azimuth, and illustrates a case where the indicator response is limited to targets below 50,000 feet. The magnitude AD, AH, AF represents the complete period of each timebase sweep. The ratio ED/AE represents the ratio of the time during which the input to the P.P.1 is blocked to the time that it is open during each time-base sweep when the elevation of the beam is 10‹. Similarly the ratios JH/AJ and GF/AG represent this time ratio for elevations of 15‹ and 20‹ respectively, the time ratio increasing as the elevation increases. Referring to Fig. 3., elevational movement of the transmitter aerial is conveyed mechanically to a generator A producing a voltage V sin # which is fed to another voltage generator B comprising a linear time-base circuit triggered by the transmitter and which provides an output voltage Kr sin #. This voltage, which is proportional to the height corresponding to the elevation # and the instantaneous range r is fed to a unit C in which it is compared with a fixed voltage corresponding to a selected height and which provides an output when the rising voltage from the generator B exceeds the fixed value. The output of the unit C is fed to.a blanking generator D which in turn blocks the input of the indicator. Two voltage comparison units such as C may be provided, one for opening the indicator when h exceeds a selected minimum value and the other for closing it when h exceeds a selected maximum value. The invention may be applied also to object-locating systems employing for example, infra-red radiations or sonic or super-sonic radiations.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB96945A GB588851A (en) | 1945-01-11 | 1945-01-11 | Improvements in or relating to object-locating and -detecting systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB96945A GB588851A (en) | 1945-01-11 | 1945-01-11 | Improvements in or relating to object-locating and -detecting systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB588851A true GB588851A (en) | 1947-06-04 |
Family
ID=9713704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB96945A Expired GB588851A (en) | 1945-01-11 | 1945-01-11 | Improvements in or relating to object-locating and -detecting systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB588851A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2577166A (en) * | 1947-09-30 | 1951-12-04 | Rca Corp | Aircraft traffic control system |
US2709252A (en) * | 1948-08-20 | 1955-05-24 | Gilfillan Bros Inc | Multi-plane tracking in ground controlled approach system |
US2832953A (en) * | 1951-04-23 | 1958-04-29 | Gilfillan Bros Inc | Sweep limiter |
US3525994A (en) * | 1967-08-28 | 1970-08-25 | Aai Corp | Radar system including altitude layer selector |
-
1945
- 1945-01-11 GB GB96945A patent/GB588851A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2577166A (en) * | 1947-09-30 | 1951-12-04 | Rca Corp | Aircraft traffic control system |
US2709252A (en) * | 1948-08-20 | 1955-05-24 | Gilfillan Bros Inc | Multi-plane tracking in ground controlled approach system |
US2832953A (en) * | 1951-04-23 | 1958-04-29 | Gilfillan Bros Inc | Sweep limiter |
US3525994A (en) * | 1967-08-28 | 1970-08-25 | Aai Corp | Radar system including altitude layer selector |
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