GB577854A - Improvements relating to the measurement of distances by electromagnetic radiation - Google Patents

Improvements relating to the measurement of distances by electromagnetic radiation

Info

Publication number
GB577854A
GB577854A GB1669741A GB1669741A GB577854A GB 577854 A GB577854 A GB 577854A GB 1669741 A GB1669741 A GB 1669741A GB 1669741 A GB1669741 A GB 1669741A GB 577854 A GB577854 A GB 577854A
Authority
GB
United Kingdom
Prior art keywords
pulses
transmitted
received
waves
duration
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
Application number
GB1669741A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to FR958877D priority Critical patent/FR958877A/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1669741A priority patent/GB577854A/en
Priority to US673769A priority patent/US2570235A/en
Publication of GB577854A publication Critical patent/GB577854A/en
Expired legal-status Critical Current

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
    • G01S13/343—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
    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • 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
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/14—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein a voltage or current pulse is initiated and terminated in accordance respectively with the pulse transmission and echo reception
    • 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

Abstract

577,854. Radio-echo apparatus. STANDARD TELEPHONES & CABLES, Ltd. (International Standard Electric Corporation). Dec. 26, 1941, No. 16697. [Class 40 (v)] [Also in Group XXXVI] An arrangement for determining the distance of an obstacle by the transmission of pulsating radiation and receiving after reflection uses at the receiver the contemporaneous transmitted radiation and received radiation after reflection to produce pulses whose durations are equal to the time that elapses between the end or beginning of a transmitted pulsation and the end or beginning of the pulsation of the corresponding received reflected radiation, means being provided for giving an indication of the duration of these pulses. In Fig. 1 the full line indicates a frequency wave continuously variable between values f, F. This wave is transmitted and received after reflection at the object with a line lag t, the received wave being shown in dotted lines. The transmitted and received waves are heterodyned giving the resultant shown in the lower part of Fig. 1 in which pulses are formed having a duration equal to the elapsed time of travel of the waves. These are applied to a limiting detector system by which they are transformed into pulsating current of constant amplitude having a mean value proportional to the elapsed time of travel of the waves. The pulsating current is measured on a milliammeter graduated in distances. In a modification, Fig. 3, pulses of duration d greater than the maximum elapsed time for echoes from the most distant objects are transmitted. Reflected pulses shown in dotted lines arrive with a time lag t. The receiver is blocked during each transmitted pulse so that the duration of the received pulses is equal to the elapsed time t of travel of the waves to and from the obstacle as shown in the lower part of Fig. 3. These pulses are applied to a limiting device and their average value read on a milliammeter. Alternatively a cathode-ray oscillograph may be employed.
GB1669741A 1940-04-12 1941-12-26 Improvements relating to the measurement of distances by electromagnetic radiation Expired GB577854A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR958877D FR958877A (en) 1940-04-12
GB1669741A GB577854A (en) 1941-12-26 1941-12-26 Improvements relating to the measurement of distances by electromagnetic radiation
US673769A US2570235A (en) 1940-04-12 1946-06-01 Device for measurement of the distances of obstacles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1669741A GB577854A (en) 1941-12-26 1941-12-26 Improvements relating to the measurement of distances by electromagnetic radiation

Publications (1)

Publication Number Publication Date
GB577854A true GB577854A (en) 1946-06-04

Family

ID=10081995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1669741A Expired GB577854A (en) 1940-04-12 1941-12-26 Improvements relating to the measurement of distances by electromagnetic radiation

Country Status (1)

Country Link
GB (1) GB577854A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2954516A1 (en) * 2009-12-18 2011-06-24 Thales Sa RADAR DETECTION METHOD, IN PARTICULAR FOR AEROPORT RADARS USING A DETECTION AND OBSTACLE REMOVAL FUNCTION

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2954516A1 (en) * 2009-12-18 2011-06-24 Thales Sa RADAR DETECTION METHOD, IN PARTICULAR FOR AEROPORT RADARS USING A DETECTION AND OBSTACLE REMOVAL FUNCTION
EP2339369A1 (en) * 2009-12-18 2011-06-29 Thales Radar detection method, mainly for airborne radars implementing an obstacle-detection and avoidance function
US8493265B2 (en) 2009-12-18 2013-07-23 Thales Radar detection method, notably for airborne radars implementing an obstacle detection and avoidance function

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