GB1305021A - - Google Patents

Info

Publication number
GB1305021A
GB1305021A GB3104260A GB3104260A GB1305021A GB 1305021 A GB1305021 A GB 1305021A GB 3104260 A GB3104260 A GB 3104260A GB 3104260 A GB3104260 A GB 3104260A GB 1305021 A GB1305021 A GB 1305021A
Authority
GB
United Kingdom
Prior art keywords
unit
output
frequency
amplitude modulation
amplifier
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
GB3104260A
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
Application filed filed Critical
Publication of GB1305021A publication Critical patent/GB1305021A/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
    • G01S13/342—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 sinusoidal 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
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection

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

1305021 Radar TELECOMMUNICATIONS RADIOELECTRIQUES ET TELEPHONIQUES 8 Sept 1960 [8 Sept 1959] 31042/60 Heading H4D A radar triggering arrangement in which the beat signal between a frequency modulated emitted wave and a wave reflected from a target is used to produce a triggering signal when the target lies within the polar diagrams of the transmitting and receiving aerials, these being cones with a small common volume, comprises a transmitter adapted to produce a frequency modulated output having a wobbulation of such amplitude and frequency that mechanical resonances, and hence undesired microphony effects, are neglible, an amplifier through which the beat signal is passed and having a slope substantially corresponding to the increase of the slope of the curve of the energy reflected by an obstacle as a function of the distance of the obstacle, a counter of the number of cycles of amplitude modulation of the output of the amplifier, means for periodically resetting the counter to zero, and means for producing a triggering signal when the number of cycles counted equals a predetermined number. In Fig. 3 the transmitter 1 is a reflex klystron the reflector of which is modulated by a wobbulated sinusoidal oscillator 4. Signals from the receiver aerials are added to the transmitted signals and passed through filters 7, 71; detectors 8, 81; and amplifiers 9, 9<SP>1</SP> to a mixer 10. The difference output from mixer 10 is passed through a filter 12, which removes any amplitude modulation caused by amplitude modulation of the klystron, to a high-pass mean-frequency amplifier 13 the response curve of which has a slope of 12 db. per octave. It is explained in the Specification that if a target is present in the volume to which the apparatus is sensitive, the output of amplifier 13 will contain an amplitude modulation of twice the wobbulation frequency; this modulation is detected by detector 14 and amplified by a low frequency amplifier 15. Unit 16 is a level comparator which produces a pulse of constant width and amplitude in response to each positive peak input of sufficient amplitude, and a pulse counter 17 counter 17 counts the output of unit 16. Unit 18 is an integrator unit periodically reset to zero by unit 19, and when unit 18 counts up to a number of pulses which is fixed in advance a signal is sent to stage 20 to produce a triggering signal. When the mean reflector potential of klystron 1 is properly adjusted there is substantially no amplitude modulation at wobbulation frequency; if the mean reflector potential drifts away from the optimum the phase of the amplitude modulation produced indicates the sign of the deviation, and this phase is measured by comparing in unit 11 a sum output from unit 10 with an output from oscillator 4; the output of unit 11 is applied through unit 3 to control the mean reflector potential of the klystron 1.
GB3104260A 1959-09-08 1960-09-08 Expired GB1305021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR804572 1959-09-08

Publications (1)

Publication Number Publication Date
GB1305021A true GB1305021A (en) 1973-01-31

Family

ID=8718935

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3104260A Expired GB1305021A (en) 1959-09-08 1960-09-08

Country Status (2)

Country Link
FR (1) FR1605052A (en)
GB (1) GB1305021A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199715A (en) * 1986-03-27 1988-07-13 C S Jennings Detection of metal and other materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199715A (en) * 1986-03-27 1988-07-13 C S Jennings Detection of metal and other materials
GB2199715B (en) * 1986-03-27 1990-11-21 C S Jennings Detection of metal and other materials

Also Published As

Publication number Publication date
FR1605052A (en) 1973-01-12

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed