GB1371426A - Automatic gain control in radio navigation systems - Google Patents

Automatic gain control in radio navigation systems

Info

Publication number
GB1371426A
GB1371426A GB1705972A GB1705972A GB1371426A GB 1371426 A GB1371426 A GB 1371426A GB 1705972 A GB1705972 A GB 1705972A GB 1705972 A GB1705972 A GB 1705972A GB 1371426 A GB1371426 A GB 1371426A
Authority
GB
United Kingdom
Prior art keywords
circuit
amplifier
gate
logic level
pulse
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
GB1705972A
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 GB1371426A publication Critical patent/GB1371426A/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
    • G01S13/785—Distance Measuring Equipment [DME] systems
    • G01S13/787—Distance Measuring Equipment [DME] systems co-operating with direction defining beacons

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Circuits Of Receivers In General (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1371426 Radio navigation INTERNATIONAL STANDARD ELECTRIC CORP 13 April 1972 [20 April 1971] 17059/72 Heading H4D A known airborne TACAN apparatus incorporates automatic gain control (A.G.C.) of receiving I.F. amplifier 6, the A.G.C. voltage being derived by an integrator 15 (of time constant T 0 about one second) the input to which is taken from an AND gate 15 supplied from a circuit 14 which introduces a delay such that the second pulse of a responding pulse pair overlaps the pulse produced by a monostable 12. If a high amplitude signal is received, amplifier 6 saturates and the receiver may remain blocked at high gain and no further pulse pair can be decoded. According to the invention the blocking is alleviated by adding a circuit between the points a, b. Said circuit (in the embodiment) consists of a circuit 17 which delivers a logic level "1" when its input is a D.C. voltage close to E or otherwise a logic level "0" ; a NOT gate 18; a multivibrator 19 delivering a logic level "1" every T 2 seconds, where T 2 is approximately equal to T 0 ; an AND gate 20; and an OR gate 21. When a distorted output (due to amplifier 6 saturation) issues from decoder 9, 10, 12 cannot operate correctly and no pulse is produced at the output of mono-stable 12 thereby blocking the receiver. After a time logic level "0" issues from circuit 17 thus producing an A.G.C. voltage proportional to the amplitude of the output of detector 7 whereby the gain of amplifier 6 is reduced and the receiver unblocked. Circuit 17 may comprise an operational amplifier (22, Fig. 2, not shown) with a negative feedback circuit of a specified time constant, followed by an inverter (26).
GB1705972A 1971-04-20 1972-04-13 Automatic gain control in radio navigation systems Expired GB1371426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7113919A FR2134773A5 (en) 1971-04-20 1971-04-20

Publications (1)

Publication Number Publication Date
GB1371426A true GB1371426A (en) 1974-10-23

Family

ID=9075579

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1705972A Expired GB1371426A (en) 1971-04-20 1972-04-13 Automatic gain control in radio navigation systems

Country Status (6)

Country Link
JP (1) JPS5124354B1 (en)
BE (1) BE782348A (en)
DE (1) DE2218187C3 (en)
ES (1) ES401904A1 (en)
FR (1) FR2134773A5 (en)
GB (1) GB1371426A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111262539A (en) * 2020-01-16 2020-06-09 磐基技术有限公司 Automatic gain control method based on joint detection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55150737U (en) * 1979-04-18 1980-10-30

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111262539A (en) * 2020-01-16 2020-06-09 磐基技术有限公司 Automatic gain control method based on joint detection
CN111262539B (en) * 2020-01-16 2023-03-24 磐基技术有限公司 Automatic gain control method based on joint detection

Also Published As

Publication number Publication date
DE2218187B2 (en) 1977-10-13
JPS5124354B1 (en) 1976-07-23
DE2218187C3 (en) 1978-06-01
DE2218187A1 (en) 1972-11-02
FR2134773A5 (en) 1972-12-08
BE782348A (en) 1972-10-20
ES401904A1 (en) 1975-03-01

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee