GB701620A - Improvements in and relating to rotational scanning systems - Google Patents
Improvements in and relating to rotational scanning systemsInfo
- Publication number
- GB701620A GB701620A GB28743/51A GB2874351A GB701620A GB 701620 A GB701620 A GB 701620A GB 28743/51 A GB28743/51 A GB 28743/51A GB 2874351 A GB2874351 A GB 2874351A GB 701620 A GB701620 A GB 701620A
- Authority
- GB
- United Kingdom
- Prior art keywords
- proportional
- sine wave
- voltage
- pulse train
- cos
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
- H03K4/12—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor
-
- 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
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
- G01S13/426—Scanning radar, e.g. 3D radar
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
701,620. Radar; pulse generating circuits. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 7, 1951 [Dec. 8, 1950], No. 28743/51. Classes 40 (6) and 40 (7). [Also in Group XXXVI] D.C. voltages proportional to Œ sin e and Œ cos e are produced by generating from a sinusoidal waveform a pulse train of equal recurrence frequency, the phase displacement of the pulse train relative to the sine wave being proportional to e, and separately combining the pulse train with four phase-quadrature components of the sine wave to give four composite waveforms having envelopes whose amplitudes are proportional to Œ sin e and Œ cos e. The invention is applicable to a radar resolved P.P.I. or sector display in which the X and Y components of the timebase are modulated by the sine e and cos e voltages the angle e being the instantaneous angular position of the aerial. As shown the sine wave is generated by an R.C. oscillator VI, phase quadrature components thereof being produced at terminals A. B, C, D, and the component at B being applied to render V5 conductive during the positive half cycles thereby producing a train of sawtooth waves at the anode due to the effect of components R and C. The potentiometer P is ganged to the aerial and the positive voltage v at the slider which is proportional to e is applied to the cathode of V5 and so combined with the sawtooth voltage in the anode circuit. The resultant waveform, Fig. 5, is applied to the grid of a blocking oscillator V6 which fires each time the amplitude of the resultant waveform reaches a predetermined level L to give a train of pulses, Fig. 6 (not shown), the displacement of each pulse from a reference portion of the sine wave being proportional to the instantaneous amplitude of v. The pulse train is combined with a sine wave from B and the composite waveform, Fig. 7, is applied to a peak rectifier V10 whose cathode output comprises a D.C. voltage proportional to the envelope 14 of the composite wave which is proportional to sin e and this voltage is applied to one of the timebase circuits 5 to modulate the sweep voltage applied to one of the deflector plates of the cathode-ray tube V11. Voltages proportional to sin e and Œ cos e for modulating the sweep voltages applied to the other deflector plates are produced in a similar manner by combining the pulse train from V6 with sine waves from A, C and D in the peak rectifier V7, V8 and V9.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1030714T | 1950-12-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB701620A true GB701620A (en) | 1953-12-30 |
Family
ID=9582667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28743/51A Expired GB701620A (en) | 1950-12-08 | 1951-12-07 | Improvements in and relating to rotational scanning systems |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE507636A (en) |
FR (1) | FR1030714A (en) |
GB (1) | GB701620A (en) |
-
0
- BE BE507636D patent/BE507636A/xx unknown
-
1950
- 1950-12-08 FR FR1030714D patent/FR1030714A/en not_active Expired
-
1951
- 1951-12-07 GB GB28743/51A patent/GB701620A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1030714A (en) | 1953-06-16 |
BE507636A (en) |
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