GB1158759A - Impulse-Pair Detector - Google Patents

Impulse-Pair Detector

Info

Publication number
GB1158759A
GB1158759A GB1579167A GB1579167A GB1158759A GB 1158759 A GB1158759 A GB 1158759A GB 1579167 A GB1579167 A GB 1579167A GB 1579167 A GB1579167 A GB 1579167A GB 1158759 A GB1158759 A GB 1158759A
Authority
GB
United Kingdom
Prior art keywords
shift register
pulse
gate
input
pulses
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
GB1579167A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1158759A publication Critical patent/GB1158759A/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
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/78—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe
    • G01S13/781—Secondary Surveillance Radar [SSR] in general
    • G01S13/784—Coders or decoders therefor; Degarbling systems; Defruiting systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

1,158,759. Circuits responding to particular signals. INTERNATIONAL STANDARD ELECTRIC CORP. 6 April, 1967 [13 April, 1966], No. 15791/67. Heading G4H. [Also in Division H4] An impulse pair detector for use in radio navigation comprises a shift register 7 to which the first pulse is applied, the shift register being driven by clock pulses from source HD and the outputs 8 from the stages thereof being gated at 9.1, 9.2 &c. with the input line 4b to give a signal when one of the shift register output coincides with an input pulse. When a pulse pair is detected a second source of clock pulses HC and a second group of gates 10.0, 10.1 &c. is coupled to the shift register to generate a modulated reply signal. The input at 1 is applied via gate 2 and/or gate 5 to the shift register. An input pulse, whether one of a valid pair, or a spurious pulse will enter a " 1 " in the shift register and set flip-flop 16. This energizes the third input to gates 9.1 &c. and unblocks gate 14 so that pulses from source HD are applied to stop the register. If a second pulse coincides with the "1" in an appropriate stage of the shift register or gate 9.1 &c. gives an output to set flip-flop 24, closing gate 2 and preventing any more pulses reaching the shift register. A spurious pulse, which is not followed at the proper interval by another pulse passes to the end of the shift register and at output F resets the circuit to its initial condition. The signal on line 25 also resets flip-flop 16 and opens gate 26 to allow pulses from source HC to pass to the stepping input of the shift register for the second phase of operation in which a single pulse entered from flip-flop 30 passes in turn through each stage giving successive outputs from gates 10.0 &c. These are held open by the signal on line 25. The distributed signals from gates 10.0, 10.1 &c. are applied to stages 13.0, 13.1 &c., some of which are set to "1" and some to "0" so that a reply pattern of 1's and 0's is sent in response to the reception of a valid pair of pulses.
GB1579167A 1966-04-13 1967-04-06 Impulse-Pair Detector Expired GB1158759A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR75057406 1966-04-13

Publications (1)

Publication Number Publication Date
GB1158759A true GB1158759A (en) 1969-07-16

Family

ID=9696046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1579167A Expired GB1158759A (en) 1966-04-13 1967-04-06 Impulse-Pair Detector

Country Status (2)

Country Link
GB (1) GB1158759A (en)
SE (1) SE320972B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174223A (en) * 1985-03-15 1986-10-29 T Sa Message receiving devices for missiles
EP0385158A2 (en) * 1989-03-03 1990-09-05 Alcatel SEL Aktiengesellschaft Pulse spacing decoding

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174223A (en) * 1985-03-15 1986-10-29 T Sa Message receiving devices for missiles
EP0385158A2 (en) * 1989-03-03 1990-09-05 Alcatel SEL Aktiengesellschaft Pulse spacing decoding
EP0385158A3 (en) * 1989-03-03 1991-05-08 Alcatel SEL Aktiengesellschaft Pulse spacing decoding
US5093844A (en) * 1989-03-03 1992-03-03 Standard Elektrik Lorenz Aktiengesellschaft Pulse-spacing decoder

Also Published As

Publication number Publication date
SE320972B (en) 1970-02-23

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees