GB647583A - Improvements in radio location and detection arrangements - Google Patents
Improvements in radio location and detection arrangementsInfo
- Publication number
- GB647583A GB647583A GB1266847A GB1266847A GB647583A GB 647583 A GB647583 A GB 647583A GB 1266847 A GB1266847 A GB 1266847A GB 1266847 A GB1266847 A GB 1266847A GB 647583 A GB647583 A GB 647583A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- transmitted
- voltage
- rectilinearity
- energy
- 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
- 238000001514 detection method Methods 0.000 title 1
- 230000007547 defect Effects 0.000 abstract 2
- 230000035559 beat frequency Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000000737 periodic effect Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 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
- 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
-
- 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
- G01S13/343—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 sawtooth modulation
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
647,583. Radiolocation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 9, 1947, No. 12668. Drawings to Specification. [Class 40 (vii)] In F.M. radar systems of the kind wherein the frequency of transmitted continuous wave energy is linearly varied during transmission (e.g. saw-tooth or triangular modulation) and received reflected energy is combined with energy then being transmitted to produce a beat-frequency which is a measure of the distance of the reflecting target, it has been found that the periodic discontinuities in frequency variation cause sharp beat note voltage and phase changes which have a high harmonic content and cause false echo indications. A further defect in such systems is the spreading of echo " blips " on the cathode-ray tube screen due to non-rectilinearity in the limits of transmitter modulation when the frequency deviation is large. The present invention overcomes these defects by providing means whereby the radar system is smoothly rendered inoperative or of substantially reduced sensitivity during the short periods of discontinuity and regions of non-rectilinearity in the variation of the transmitted frequency. This is done by the application of a control voltage (synchronized with the transmitter modulator and preferably substantially sinusoidal) in any convenient manner known per se to reduce smoothly either the transmitted amplitude or the receiver gain, or both, during the said short periods. This voltage may be derived from a separate source or directly from the transmitter modulator. Specification 541,399 is referred to and Specifications 620,568 and 621,846 are referred to in the Provisional Specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1266847A GB647583A (en) | 1947-05-09 | 1947-05-09 | Improvements in radio location and detection arrangements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1266847A GB647583A (en) | 1947-05-09 | 1947-05-09 | Improvements in radio location and detection arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB647583A true GB647583A (en) | 1950-12-20 |
Family
ID=10008930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1266847A Expired GB647583A (en) | 1947-05-09 | 1947-05-09 | Improvements in radio location and detection arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB647583A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085789A3 (en) * | 2008-01-31 | 2011-07-06 | Yamatake Corporation | Physical quantity sensor and physical quantity measuring method |
-
1947
- 1947-05-09 GB GB1266847A patent/GB647583A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085789A3 (en) * | 2008-01-31 | 2011-07-06 | Yamatake Corporation | Physical quantity sensor and physical quantity measuring method |
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