GB1300697A - Creation of Inventions and Patents with Artificial Intelligence

GB1300697A – Improvements in or relating to interrogation-reply systems
– Google Patents

GB1300697A – Improvements in or relating to interrogation-reply systems
– Google Patents
Improvements in or relating to interrogation-reply systems

Info

Publication number
GB1300697A

GB1300697A
GB2411071A
GB2411071A
GB1300697A
GB 1300697 A
GB1300697 A
GB 1300697A
GB 2411071 A
GB2411071 A
GB 2411071A
GB 2411071 A
GB2411071 A
GB 2411071A
GB 1300697 A
GB1300697 A
GB 1300697A
Authority
GB
United Kingdom
Prior art keywords
code
interrogation
computer
stores
responder
Prior art date
1970-02-06
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
GB2411071A
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.)

Siemens AG

Original Assignee
Siemens AG
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.)
1970-02-06
Filing date
1971-04-19
Publication date
1972-12-20

1971-04-19
Application filed by Siemens AG
filed
Critical
Siemens AG

1972-12-20
Publication of GB1300697A
publication
Critical
patent/GB1300697A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

Abstract

1300697 Responder SIEMENS AG 19 April 1971 [6 Feb 1970] 24110/71 Heading H4L An aircraft responder protected against interference from an enemy, is interrogated by a friendly station by means of a code which changes from one interrogation to the next according to a pattern known to both station and responder and replies to the correct code with a coded response, the code of which also changes according to a mutually known pattern. When a predetermined situation is determined at the responder, the normal response code is replaced by one which would normally occur at a future time. The interrogating station is then made aware of the situation. A crypto-computer 3 supplies the series of interrogation codes to stores S2Z, S1Z, SG, S1V, S2V; a code passing from one store to the next at the end of an interrogation period. Store SG holds the code expected at the present time, stores S2Z, S1Z respectively hold the codes expected two and one interrogation periods in the future; and stores SIV, S2V respectively hold the codes which should have occurred one and two interrogation periods previously. The computer 3 similarly supplies the response codes to “three, two and one periods in the future” stores S3Z1, S2Z1 and S1Z1, respectively, to present store SG1 and to immediately past store S1V1. The contents of the interrogation code stores S2Z … S2V are compared with the incoming code at 4 in comparators K2Z … K2V. An agreement causes the respective one of the comparators to feed an enabling signal to the corresponding AND gate UG1Z … UG1V and the corresponding response code is transmitted at 5. If however the predetermined situation occurs a special signal device, automatically or manually actuated, feeds an enabling signal to AND gate UGS such that the response code, which should occur three periods in the future, is transmitted. If the computer 3 is in advance of the corresponding computer in the interrogating station, the incoming interrogation code will possibly be the same as that in stores S1V or S2V. The resultant signal from comparator K1V or K2V is fed to a correction unit 2 for resynchronism of the computer 3. The connection of comparator K1V to AND gate UG1V ensures that the interrogator receives the response code he is expecting. A similar computer correction takes place if the computer 3 is lagging, either comparator K1Z or K2Z giving the correction output. The normally transmitted response code may be inhibited when the special signal is transmitted. Fig. 2 (not shown).

GB2411071A
1970-02-06
1971-04-19
Improvements in or relating to interrogation-reply systems

Expired

GB1300697A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

DE19702005448

DE2005448C3
(en)

1970-02-06
1970-02-06

Response device for a radio back-beam interrogation-response system with time-dependent interrogation codes

Publications (1)

Publication Number
Publication Date

GB1300697A
true

GB1300697A
(en)

1972-12-20

Family
ID=5761627
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB2411071A
Expired

GB1300697A
(en)

1970-02-06
1971-04-19
Improvements in or relating to interrogation-reply systems

Country Status (3)

Country
Link

DE
(1)

DE2005448C3
(en)

FR
(1)

FR2079292B1
(en)

GB
(1)

GB1300697A
(en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

FR1461732A
(en)

1964-11-12
1966-02-25
Bendix Corp

Answering system, in particular for aeronautics

FR1519832A
(en)

1967-02-23
1968-04-05
Aero Etudes Conseils

Improvements to vehicle identification systems

1970

1970-02-06
DE
DE19702005448
patent/DE2005448C3/en
not_active
Expired

1971

1971-02-04
FR
FR7103729A
patent/FR2079292B1/fr
not_active
Expired

1971-04-19
GB
GB2411071A
patent/GB1300697A/en
not_active
Expired

Also Published As

Publication number
Publication date

DE2005448B2
(en)

1973-08-09

DE2005448C3
(en)

1974-03-14

DE2005448A1
(en)

1971-08-19

FR2079292A1
(en)

1971-11-12

FR2079292B1
(en)

1974-06-21

Contact information