GB1158759A - Impulse-Pair Detector - Google Patents
Impulse-Pair DetectorInfo
- 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
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.
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)
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 |
-
1957
- 1957-07-04 SE SE6282/57A patent/SE320972B/xx unknown
-
1967
- 1967-04-06 GB GB1579167A patent/GB1158759A/en not_active Expired
Cited By (4)
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 |