GB661177A - Improvements in or relating to radio apparatus for indicating distance - Google Patents
Improvements in or relating to radio apparatus for indicating distanceInfo
- Publication number
- GB661177A GB661177A GB35191/47A GB3519147A GB661177A GB 661177 A GB661177 A GB 661177A GB 35191/47 A GB35191/47 A GB 35191/47A GB 3519147 A GB3519147 A GB 3519147A GB 661177 A GB661177 A GB 661177A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- amplifier
- cathode
- signal
- aircraft
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
661,177. Radiolocation. PHILIPS ELECTRICAL, Ltd. Dec. 31, 1947 [June 23, 1939], No. 35191/47. Drawings to Specification. [Class 40 (vii)] In a frequency-modulated radar system, wherein the received reflected frequencymodulated signal is mixed with the signal then being transmitted to derive a beat signal whose frequency is a measure of the range of the reflecting object, the amplifier for amplifying the beat signals is such that its gain increases with the frequency of the signal applied thereto, whereby the signals received from the more distant objects are amplified more than those from the nearer objects. The amplifier may also include a high-pass filter which prevents signals of the modulation frequency from being applied to the indicator at the output of the amplifier. The aerial system employed is preferably of the wide-band type, for example, a conical aerial may be used. The indicator used consists of a frequency-meter; for aircraft use, a cathode-ray tube display may also be employed. The cathode-ray beam is deflected in one direction in accordance with the output of the amplifier and is deflected in a perpendicular direction by a saw-tooth wave whose frequency bears a simple relation to that of the modulation frequency. Normally a smooth, approximately sinusoidal trace is produced on the cathode-ray tube screen; however, if there is any unevenness in the ground over which the aircraft is flying, the trace will lose its simple character and exhibit harmonics which owing to frequency-characteristic of the amplifier will be enhanced. The apparatus thus indicates the nature of the terrain over which the aircraft is flying. Specification 533,538 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL661177X | 1939-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB661177A true GB661177A (en) | 1951-11-21 |
Family
ID=19797458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35191/47A Expired GB661177A (en) | 1939-06-23 | 1947-12-31 | Improvements in or relating to radio apparatus for indicating distance |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE440372A (en) |
| FR (1) | FR870146A (en) |
| GB (1) | GB661177A (en) |
-
1941
- 1941-01-22 BE BE440372D patent/BE440372A/xx unknown
- 1941-02-18 FR FR870146D patent/FR870146A/en not_active Expired
-
1947
- 1947-12-31 GB GB35191/47A patent/GB661177A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR870146A (en) | 1942-03-04 |
| BE440372A (en) | 1941-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2234329A (en) | Distance determining device | |
| US3031643A (en) | Transmission line fence burglar alarm | |
| GB590504A (en) | Apparatus utilising a rotating radio beam for affording a visual plan indication of the postion of remote objects | |
| US2532566A (en) | Photoelectric gate control for pulse-echo systems | |
| US3719946A (en) | Radar phase comparison system including a superhetrodyne receiver | |
| US3155972A (en) | Continuous wave radar | |
| GB574933A (en) | Improvements in or relating to radio systems for landing aeroplanes | |
| GB965326A (en) | Tactical radio landing system | |
| GB574965A (en) | Improvements in or relating to apparatus for determining the distance of an object by means of a reflected radio wave | |
| GB661177A (en) | Improvements in or relating to radio apparatus for indicating distance | |
| US2433283A (en) | Radio position finding | |
| GB599913A (en) | Improvements in or relating to cathode ray tube inductors | |
| GB772639A (en) | Ultra short range altimeter system | |
| US2492012A (en) | Radio frequency system for altitude or distance measurement | |
| GB624725A (en) | Improvements in or relating to radar equipment utilizing the doppler effect for detecting relatively moving objects | |
| US2418308A (en) | Radio direction finder | |
| US2475612A (en) | Direction finding system | |
| US2419046A (en) | Frequency modulated altimeter or distance indicator | |
| US3403397A (en) | Duochromatic indicator for a diversity polarization radar receiver | |
| US2613317A (en) | Circuits for object locator apparatus | |
| US2602909A (en) | Means for improving the definition in the presentation of intensity modulated cathode-ray tubes | |
| US2883663A (en) | Means for direction finding and ranging on atmospherics | |
| GB581698A (en) | Improvements relating to receivers for electrical pulses | |
| CA1064148A (en) | Frequency shift rate detector | |
| JPS54135596A (en) | Laser radar |