GB620568A - Improvements in radio location and detection arrangements - Google Patents
Improvements in radio location and detection arrangementsInfo
- Publication number
- GB620568A GB620568A GB1910245A GB1910245A GB620568A GB 620568 A GB620568 A GB 620568A GB 1910245 A GB1910245 A GB 1910245A GB 1910245 A GB1910245 A GB 1910245A GB 620568 A GB620568 A GB 620568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- waveform
- cathode
- ray tube
- signal
- 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
- 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
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
- G01S13/345—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using triangular modulation
Abstract
620,568. Radiolocation. RUST, N. M., and PARTINGTON, G. E. July 25, 1945, No. 19102. [Class 40 (vii)] In a frequency-modulated radar system, wherein reflected waves are mixed with the transmitted waves to produce beat-frequency signals, the beat-frequency signals are applied through a fixed-tuned frequency selector to an indicator and the rate of change of transmitted frequency is varied so that the selector passes in succession echo signals received from reflecting objects at different ranges. The echo signals may be displayed on a cathode-ray tube, the range deflection of which is varied in synchronism with the rate of change of transmitted frequency so that the ranges of the various echo producing objects may be deter. mined. An aural indicator or a meter may be used in place, of a cathode-ray tube. A generator. 3 produces a symmetrical triangular waveform (a) which is mixed with a sawtooth waveform (b), produced by generator 5, in control amplifier 4 so that the signal applied to transmitter 6 is as shown as (c). The signal transmitted by 6 is then frequency-modulated in accordance with (c). (Alternatively the wave. form (a) may be frequency-modulated by waveform (b), this signal being used to modulate the transmitted frequency.) The reflected signals are received at 7 where they are mixed with signals from 6 applied through the variable coupling device 8. The receiver 7 may be rendered inoperative when the sawtooth wave changes slope. The demodulated output of the receiver is applied to a fixed frequency selecting device 9 and thence to a cathode-ray tube display unit 10, the horizontal sweep of which is controlled by the waveform (b) from generator 5. The beat-frequency produced by a reflected signal being proportional to the range and to the rate of change of transmitted frequency, which varies on account of the form of the modulating signal (c) (or its frequencymodulated counterpart), a signal from a given range will be passed by the device 9 when the waveform (c) has reached a certain state corresponding to a certain phase angle of the waveform (b), and therefore an indication will be produced on the cathode-ray tube indicative of the range. In order to provide a linear range scale instead of the one illustrated, which closes up towards the longer ranges, a distorting device may be inserted between either 4 and 5 or 5 and 10 so that either the waveform (c) is suitably distorted or the rate of sweep on the cathode-ray tube is suitably varied. The band-width and/or gain of the device 9 may be made variable with range so that uniform discrimination and sensitivity may be obtained. Also, if desired, a manual control may be incorporated into the system so that any particular target may be investigated more closely. A P.P.I. may be used in place of the A-scan described. The Provisional Specification describes also a system wherein each complete cycle comprises a single frequency sweep over a wide band, the rate of change of frequency varying continuously during the sweep. Thus, it may be arranged that echoes from near objects are passed by the selective-device at the beginning of the cycle and from distant objects at its end. The horizontal sweep of the cathode-ray tube is derived from the frequencysweep control waveform. Specifications 581,162 and 594,765 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1910245A GB620568A (en) | 1945-07-25 | 1945-07-25 | Improvements in radio location and detection arrangements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1910245A GB620568A (en) | 1945-07-25 | 1945-07-25 | Improvements in radio location and detection arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
GB620568A true GB620568A (en) | 1949-03-28 |
Family
ID=10123806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1910245A Expired GB620568A (en) | 1945-07-25 | 1945-07-25 | Improvements in radio location and detection arrangements |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB620568A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108535728A (en) * | 2017-03-06 | 2018-09-14 | 恩智浦有限公司 | For detecting and the equipment of ranging |
CN112286068A (en) * | 2020-10-29 | 2021-01-29 | 广州河东科技有限公司 | Intelligent panel based on microwave awakening and intelligent panel awakening method |
-
1945
- 1945-07-25 GB GB1910245A patent/GB620568A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108535728A (en) * | 2017-03-06 | 2018-09-14 | 恩智浦有限公司 | For detecting and the equipment of ranging |
CN108535728B (en) * | 2017-03-06 | 2023-09-29 | 恩智浦有限公司 | Device for detecting and ranging |
CN112286068A (en) * | 2020-10-29 | 2021-01-29 | 广州河东科技有限公司 | Intelligent panel based on microwave awakening and intelligent panel awakening method |
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