GB1396284A - Radar monitoring systems - Google Patents

Radar monitoring systems

Info

Publication number
GB1396284A
GB1396284A GB2876071A GB2876071A GB1396284A GB 1396284 A GB1396284 A GB 1396284A GB 2876071 A GB2876071 A GB 2876071A GB 2876071 A GB2876071 A GB 2876071A GB 1396284 A GB1396284 A GB 1396284A
Authority
GB
United Kingdom
Prior art keywords
radar
code
uhf
delay
receiver
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
GB2876071A
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB2876071A priority Critical patent/GB1396284A/en
Priority to DE19722229802 priority patent/DE2229802A1/en
Publication of GB1396284A publication Critical patent/GB1396284A/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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/003—Transmission of data between radar, sonar or lidar systems and remote stations
    • G01S7/006—Transmission of data between radar, sonar or lidar systems and remote stations using shared front-end circuitry, e.g. antennas
    • 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
    • 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
    • G01S13/87—Combinations of radar systems, e.g. primary radar and secondary radar

Abstract

1396284 Secondary radar systems ASSOCIATED ELECTRICAL INDUSTRIES Ltd 19 June 1972 [18 June 1971] 28760/71 Heading H4D In a radar monitoring system for determining the range of craft, each has a radar responder which is energized by a radio transmission unique to that responder, the radio transmissions being completely separate from the radar transmissions. In a surveillance area, e.g. canal leading to dock area, interrogation stations are situated at 4-5 mile intervals. Each ship entering the canal is issued with a radar beacon including a UHF radio receiver and X-band radar receiver-transmitter. Each beacon has a unique two-tone audio coding which is decoded by the UHF receiver to energize the radar receiver-transmitter. This comprises an X-band receiving-transmitting aerial and a delay line canceller to detect the primary radar pulse pairs. 64 Ásec. after reception of a pulse pair, a single reply pulse is transmitted at a slightly different frequency to the interrogation pulses. The system includes a central control station which transmits one UHF code every 1À5 sees. The interrogating station, Fig. 2, receives this at antenna 17 and retransmits the code at a different frequency via up- and downstream aerials 7, 8. Each code is detected and used to trigger a generator 13 which enables sequentially pre-amplifiers 14 connected to up- and downstream radar antennae 1, 2. Generator 13 also triggers transmitter 5 to radiate several hundred primary radar pulse pairs per code. Each transmitted pair resets counter 26 to zero after a 64 Ásec. delay 25. Reply signals pass threshold 28 and gate 20 and read the range measurement into decoder 27 which sets the measurement into one of twenty range cells 19 each of which comprises a counter. At the end of a complete code cycle counters 19 thus contain a distribution of ranges. After a delay 24 unique to each interrogator, selection logic 16 analyses the distribution to pass the most likely range to generator 25, which adds a digit representing up- or downstream, an interrogator identifying code and a parity check digit. This signal is then relayed via the UHF aerial 17 to the control station. Delay 24 ensures that each interrogator replies in the correct order.
GB2876071A 1971-06-18 1971-06-18 Radar monitoring systems Expired GB1396284A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2876071A GB1396284A (en) 1971-06-18 1971-06-18 Radar monitoring systems
DE19722229802 DE2229802A1 (en) 1971-06-18 1972-06-19 RADAR MONITORING DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2876071A GB1396284A (en) 1971-06-18 1971-06-18 Radar monitoring systems

Publications (1)

Publication Number Publication Date
GB1396284A true GB1396284A (en) 1975-06-04

Family

ID=10280710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2876071A Expired GB1396284A (en) 1971-06-18 1971-06-18 Radar monitoring systems

Country Status (2)

Country Link
DE (1) DE2229802A1 (en)
GB (1) GB1396284A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142201A (en) * 1983-06-24 1985-01-09 Plessey Co Plc Radar system
GB2165414A (en) * 1984-10-03 1986-04-09 Standard Telephones Cables Plc Runway occupancy warning system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142201A (en) * 1983-06-24 1985-01-09 Plessey Co Plc Radar system
GB2165414A (en) * 1984-10-03 1986-04-09 Standard Telephones Cables Plc Runway occupancy warning system

Also Published As

Publication number Publication date
DE2229802A1 (en) 1974-04-04

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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