GB586115A - Methods of and systems for the demodulation of a wave which is repetitive at equal known time intervals - Google Patents

Methods of and systems for the demodulation of a wave which is repetitive at equal known time intervals

Info

Publication number
GB586115A
GB586115A GB652/41A GB65241A GB586115A GB 586115 A GB586115 A GB 586115A GB 652/41 A GB652/41 A GB 652/41A GB 65241 A GB65241 A GB 65241A GB 586115 A GB586115 A GB 586115A
Authority
GB
United Kingdom
Prior art keywords
wave
signal
comparison
differential detector
derived
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
GB652/41A
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB586115A publication Critical patent/GB586115A/en
Priority to ES0177220A priority Critical patent/ES177220A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse 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
    • G01S13/32—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
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2921—Extracting wanted echo-signals based on data belonging to one radar period
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
    • G01S7/2926—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods by integration
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/19—Arrangements for performing computing operations, e.g. operational amplifiers for forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions
    • G06G7/1928—Arrangements for performing computing operations, e.g. operational amplifiers for forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions for forming correlation integrals; for forming convolution integrals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/08—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements
    • H03D1/10—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements of diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

586,115. Directive wireless signalling. STANDARD TELEPHONES & CABLES, Ltd., and EARP, C. W. Jan. 17, 1941, No. 652. [Class 40 (v)] In systems for obstacle detection by radio pulses or by the frequency sweep method using a wave modulated by a signal wave which is repetitive in character, a favourable signal-tonoise ratio is obtained by feeding to a differential detector, the signal wave and a suitable comparison wave, thus eliminating random noise elements. Fig. 1A shows a receiver for use with the radio pulse system in which the detected signal is applied to one input T of a differential detector D, the comparison wave being fed in at T1. The output is taken from a low-pass filter LP. The comparison wave-is supplied by a generator S at pulse periodicity and is shaped by passage through a phase shifter PS, limiter L, high-pass filter F and half-wave rectifier R. Fig. 1B shows the frequency sweep system in which energy direct from the transmitter T whose frequency is varied cyclically over a predetermined frequency range, is made to beat with a reflected wave in the receiver detector Det. 1, the result after further detection at Det. 2 comprising the principal wave for feeding at A to one input of a differential detector as in Fig. 1A. The comparison wave is derived from the modulator M of the transmitter and is shaped by a network N before being applied at B to the second input of the differential detector. In a modification, the comparison wave is derived from the signal wave by passing it through a network which delays it for an integral number of pulse periods. In a further modification, the comparison wave is derived from the main wave by modulating it from a constant frequency source, the modulated wave being mixed in proper phase with the signal wave in a second modulator. Specification 578,114 is referred to.
GB652/41A 1941-01-17 1941-01-17 Methods of and systems for the demodulation of a wave which is repetitive at equal known time intervals Expired GB586115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES0177220A ES177220A1 (en) 1941-01-17 1947-03-13 IMPROVEMENTS IN DEMODULATION SYSTEMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB286896X 1941-01-17

Publications (1)

Publication Number Publication Date
GB586115A true GB586115A (en) 1947-03-07

Family

ID=10279547

Family Applications (1)

Application Number Title Priority Date Filing Date
GB652/41A Expired GB586115A (en) 1941-01-17 1941-01-17 Methods of and systems for the demodulation of a wave which is repetitive at equal known time intervals

Country Status (5)

Country Link
US (2) US2471418A (en)
BE (1) BE472065A (en)
CH (1) CH286896A (en)
FR (2) FR939300A (en)
GB (1) GB586115A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624652A (en) * 1946-01-16 1971-11-30 Us Navy Pulse generation system
US2786132A (en) * 1946-11-21 1957-03-19 Rines Robert Harvey Power transmission
US2718638A (en) * 1950-01-20 1955-09-20 Itt Signal correlation radio receiver
US2941202A (en) * 1951-08-04 1960-06-14 Sylvania Electric Prod Modified cross-correlation radio system and method
US2802167A (en) * 1952-04-15 1957-08-06 Gen Electric Signal voltage amplitude limiter
US2718546A (en) * 1952-11-26 1955-09-20 Motorola Inc Phase detector
US4176316A (en) 1953-03-30 1979-11-27 International Telephone & Telegraph Corp. Secure single sideband communication system using modulated noise subcarrier
USRE34004E (en) * 1953-03-30 1992-07-21 Itt Corporation Secure single sideband communication system using modulated noise subcarrier
US2790898A (en) * 1953-05-04 1957-04-30 Bady Isidore Weak signal detector using synchronously switched rectifier bridge
US2914762A (en) * 1954-02-24 1959-11-24 Raytheon Co Dual channel noise coherence reducers
US2937273A (en) * 1957-10-31 1960-05-17 Gen Dynamics Corp Detectors
US3112452A (en) * 1959-12-28 1963-11-26 Gen Electric Signal processing arrangement with filters in plural channels minimizing undesirableinterference to narrow and wide pass bands
NL270086A (en) * 1960-10-10

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1343308A (en) * 1916-09-05 1920-06-15 American Telephone & Telegraph Duplex translating-circuits
US2067021A (en) * 1929-12-12 1937-01-05 Rca Corp Means for converting electrical energy into acoustical energy
US2040221A (en) * 1933-01-04 1936-05-12 Frank C Talmadge Electrical signaling system
US2036022A (en) * 1934-01-26 1936-03-31 Rca Corp Method of and means for receiving signals
BE409533A (en) * 1934-06-02
GB454257A (en) * 1935-03-27 1936-09-28 Marconi Wireless Telegraph Co Improvements in or relating to modulated carrier wave receivers
FR803109A (en) * 1935-06-06 1936-09-23 Soc Et Liaisons Telephoniques Improvement in alternating current transmission methods and application device
US2183714A (en) * 1937-05-13 1939-12-19 Telefunken Gmbh Interference eliminator
BE428656A (en) * 1937-06-18
US2227598A (en) * 1937-07-03 1941-01-07 Sperry Gyroscope Co Inc Radio absolute altimeter
GB507754A (en) * 1937-11-16 1939-06-16 William Spencer Percival Improvements in or relating to wireless systems employing pulses
US2231704A (en) * 1939-03-04 1941-02-11 Hazeltine Corp Homodyne receiver
NL70112C (en) * 1939-10-25
US2233384A (en) * 1939-12-28 1941-02-25 Bell Telephone Labor Inc Radio receiver
US2350702A (en) * 1940-05-21 1944-06-06 Int Standard Electric Corp System of radio communication
US2410223A (en) * 1942-03-02 1946-10-29 Phillips Petroleum Co Treatment of hydrocarbons
US2401416A (en) * 1942-09-11 1946-06-04 Rca Corp Amplifier for pulses
US2398490A (en) * 1944-03-01 1946-04-16 Rca Corp Circuit for removing noise
US2408079A (en) * 1944-06-19 1946-09-24 Standard Telephones Cables Ltd Pulse discriminator

Also Published As

Publication number Publication date
US2471418A (en) 1949-05-31
CH286896A (en) 1952-11-15
FR939300A (en) 1948-11-09
FR69134E (en) 1958-10-01
BE472065A (en)
USRE23440E (en) 1951-12-18

Similar Documents

Publication Publication Date Title
US2421016A (en) Radar testing apparatus
SE7712683L (en) RADAR WORKING WITH TWO TYPES OF PULSE
US2134716A (en) Measuring speed and distance by radiant energy
US2406019A (en) Pulse modulation system
US2392546A (en) Pulse modulation receiver
US2444452A (en) Obstacle detection and communicating system
GB586115A (en) Methods of and systems for the demodulation of a wave which is repetitive at equal known time intervals
US3351859A (en) Communication system employing multipath rejection means
GB579117A (en) Improvements in or relating to means for increasing the signal to noise ratio in radio transmission systems
US3685050A (en) Single antenna signal retransmission device
US2430139A (en) Pulse number modulation system
GB1140590A (en) Electric pulse signalling system
US3396392A (en) Cw radar system
GB555993A (en) Improvements in radio communication systems
US4112368A (en) Constant amplitude carrier communications system
GB541665A (en) Improvements relating to high frequency wave transmission systems
US2416286A (en) Signal transmission system
US3727222A (en) Pseudo-random coded doppler tracking and ranging
US2462061A (en) High-frequency electrical communication system utilizing damped oscillations
US3090953A (en) Pulse burst compression radar
US3720944A (en) Signal system for jamming detection systems utilizing signal correlation
US2406803A (en) High-frequency electrical communication system
US2812428A (en) Passive responder radio system
Tuve et al. A transmitter modulating device for the study of the Kennelly-Heaviside layer by the echo method
GB1605245A (en) Phase-lock loop systems