GB1028060A - Frequency discriminator - Google Patents

Frequency discriminator

Info

Publication number
GB1028060A
GB1028060A GB47612/64A GB4761264A GB1028060A GB 1028060 A GB1028060 A GB 1028060A GB 47612/64 A GB47612/64 A GB 47612/64A GB 4761264 A GB4761264 A GB 4761264A GB 1028060 A GB1028060 A GB 1028060A
Authority
GB
United Kingdom
Prior art keywords
frequency
phase
transistors
pair
shift
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
GB47612/64A
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.)
Bendix Corp
Original Assignee
Bendix Corp
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 by Bendix Corp filed Critical Bendix Corp
Publication of GB1028060A publication Critical patent/GB1028060A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/26—Demodulation of angle-, frequency- or phase- modulated oscillations by means of sloping amplitude/frequency characteristic of tuned or reactive circuit
    • 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
    • G01S1/72—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 ultrasonic, sonic or infrasonic 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
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/585—Velocity or trajectory determination systems; Sense-of-movement determination systems processing the video signal in order to evaluate or display the velocity value
    • 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
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/60—Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/14—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of semiconductor devices having more than two electrodes

Abstract

1,028,060. Frequency and phase discriminators; measuring speed by sound waves. BENDIX CORPORATION. Nov. 23, 1964 [Dec. 13, 1963], No. 47612/64. Headings H3A and H4D. Doppler frequency shift in a carrier frequency pulse is measured by applying the pulse over a frequency sensitive phase shift network 15 and also directly (without delay) to a bi-stable phase detector 32-35 whose D.C. output, smoothed, indicates the frequency shift. The bi-stable circuit comprises a pair of crosscoupled PNP transistors 34, 35 and a pair of cross-coupled NPN transistors 32, 33, the emitters of each pair being connected to equal positive and negative voltage supplies 41, 40 and corresponding collectors of each pair being directly connected. Zero phase shift from the phase shift network 15 results in oppositetype transistors 31, 30 being conductive during alternate half-cycles and actuating the bistable circuit so that a symmetrical square wave is produced from the common collector junction of transistors 35, 33, but changes of phase with frequency cause the conduction interval of transistors 35, 33 to vary oppositely so that an average D.C. output results of magnitude and polarity, indicating the magnitude and sense of the carrier frequency shift, e.g. on an oscilloscope and the duration of the applied carrier pulse may also be indicated. The phase shift network 15 may comprise ten sections having in the series arms an inductor L 1k and capacitor C 1k series resonant at the discriminator centre frequency f 0 and in the shunt arms a capacitor C 2k and inductor L 2k parallel resonant at the same frequency f 0 , the arrangement forming a constant - K filter with zero attenuation over a pass-band covering the maximum and minimum frequency deviation and a linear phase-shift over this band; but with the resultant total delay less than the pulse duration. The Doppler pulses may also indicate information by their width. The invention is applied to a sonar system.
GB47612/64A 1963-12-13 1964-11-23 Frequency discriminator Expired GB1028060A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US33034463A 1963-12-13 1963-12-13

Publications (1)

Publication Number Publication Date
GB1028060A true GB1028060A (en) 1966-05-04

Family

ID=23289347

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47612/64A Expired GB1028060A (en) 1963-12-13 1964-11-23 Frequency discriminator

Country Status (4)

Country Link
JP (1) JPS5120863B1 (en)
DE (1) DE1523146B1 (en)
FR (1) FR1421674A (en)
GB (1) GB1028060A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1766820B1 (en) * 1968-07-24 1974-02-14 Philips Patentverwaltung FREQUENCY MEASURING METHOD FOR QUICK DETECTION OF THE CARRIER FREQUENCY OF A RECEIVED SIGNAL IN THE UHF AND / OR MICROWAVE RANGE

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870330U (en) * 1981-07-07 1983-05-13 金城　述雄 foldable can
FR2510324A1 (en) * 1981-07-24 1983-01-28 Radiotechnique METHOD FOR DEMODULATING A MODULAR FREQUENCY SIGNAL, AND DEMODULATOR ACCORDING TO SAID METHOD

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1766820B1 (en) * 1968-07-24 1974-02-14 Philips Patentverwaltung FREQUENCY MEASURING METHOD FOR QUICK DETECTION OF THE CARRIER FREQUENCY OF A RECEIVED SIGNAL IN THE UHF AND / OR MICROWAVE RANGE

Also Published As

Publication number Publication date
DE1523146B1 (en) 1969-10-23
JPS5120863B1 (en) 1976-06-28
FR1421674A (en) 1965-12-17

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