GB1504516A - Interogator/transponder system - Google Patents
Interogator/transponder systemInfo
- Publication number
- GB1504516A GB1504516A GB1462674A GB1462674A GB1504516A GB 1504516 A GB1504516 A GB 1504516A GB 1462674 A GB1462674 A GB 1462674A GB 1462674 A GB1462674 A GB 1462674A GB 1504516 A GB1504516 A GB 1504516A
- Authority
- GB
- United Kingdom
- Prior art keywords
- interrogator
- signal
- vehicle
- returned
- phase
- 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
- 238000001514 detection method Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
- B61L25/04—Indicating or recording train identities
- B61L25/043—Indicating or recording train identities using inductive tags
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
1504516 Interrogator-responder systems PLESSEY CO Ltd 24 March 1975 [2 April 1974] 14626/74 Heading H4L In an interrogator-responder system for use in vehicle detection, the direction of travel of the vehicle is assessed at the interrogator, by comparing the phase of the signal returned from the vehicle responder (this signal comprising a data signal having a frequency related to the interrogator clock frequency) with that of a reference signal derived from the interrogator clock frequency radiated to the vehicle. When the returned signal is at half the clock frequency, for one direction of travel the phase of the returned signal will either be the same or different by # from the reference, while in the other direction it will be #/2 leading or lagging. It is desirable to arrange the transponder receiver end transmitter loops in upright positions in the vehicle perpendicular to the road and also at right angles to the direction of movement. If the relationship between the returned and clock frequencies is some factor other than half, then some other phase relationship will apply.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1462674A GB1504516A (en) | 1975-03-24 | 1975-03-24 | Interogator/transponder system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1462674A GB1504516A (en) | 1975-03-24 | 1975-03-24 | Interogator/transponder system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1504516A true GB1504516A (en) | 1978-03-22 |
Family
ID=10044667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1462674A Expired GB1504516A (en) | 1975-03-24 | 1975-03-24 | Interogator/transponder system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1504516A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4674618A (en) * | 1983-12-06 | 1987-06-23 | Mars Incorporated | Tokens and token handling devices |
EP0618557A1 (en) * | 1993-03-31 | 1994-10-05 | PREH-WERKE GmbH & Co. KG | Information transmitting device for road traffic |
-
1975
- 1975-03-24 GB GB1462674A patent/GB1504516A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4674618A (en) * | 1983-12-06 | 1987-06-23 | Mars Incorporated | Tokens and token handling devices |
US4926996A (en) * | 1983-12-06 | 1990-05-22 | Mars Incorporated | Two way communication token interrogation apparatus |
EP0618557A1 (en) * | 1993-03-31 | 1994-10-05 | PREH-WERKE GmbH & Co. KG | Information transmitting device for road traffic |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19950323 |