GB1213630A – Improvements in or relating to vehicle monitoring systems
– Google Patents
GB1213630A – Improvements in or relating to vehicle monitoring systems
– Google Patents
Improvements in or relating to vehicle monitoring systems
Info
Publication number
GB1213630A
GB1213630A
GB5784366A
GB5784366A
GB1213630A
GB 1213630 A
GB1213630 A
GB 1213630A
GB 5784366 A
GB5784366 A
GB 5784366A
GB 5784366 A
GB5784366 A
GB 5784366A
GB 1213630 A
GB1213630 A
GB 1213630A
Authority
GB
United Kingdom
Prior art keywords
signal
code
transponder
interrogator
vehicle
Prior art date
1966-12-24
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
GB5784366A
Inventor
William Spencer Percival
Donald Peter Franklin
Edmund John Gowler
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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.)
1966-12-24
Filing date
1966-12-24
Publication date
1970-11-25
1966-12-24
Application filed by EMI Ltd, Electrical and Musical Industries Ltd
filed
Critical
EMI Ltd
1966-12-24
Priority to GB5784366A
priority
Critical
patent/GB1213630A/en
1970-11-25
Publication of GB1213630A
publication
Critical
patent/GB1213630A/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
1,213,630. Vehicle radar signalling. ELECTRIC & MUSICAL INDUSTRIES Ltd. 22 Dec., 1967 [24 Dec., 1966], No. 57843/66. Heading G4Q. [Also in Division H4] In a land vehicle monitoring system each vehicle carries a radio interrogator/transponder, a vehicle can determine its headway from a transponding vehicle, the interrogator codes its emission in dependence on its path, and a transponder responds selectively to differently coded signals. In the embodiment omnibuses travelling on a special track are restricted to those carrying the interrogator and transponder shown in Fig. 1. A coded pulse train from modulator 3 is transmitted from the interrogator, and if such a signal is received by an aerial 40 from the following omnibus coding circuit 46 affords transmission of a coded signal on a different carrier frequency but only if detector 44 received a correctly coded signal. A signal received by interrogator aerial 11 produces an output from detector 21 only if correctly coded. The output of range unit 19 is compared with the optimum inter-vehicle spacing (i.e. headway) derived from the speed of the omnibus and green, amber and red lights in display 18 are actuated according to whether the actual headway is greater than, near to, or less than, the optimum headway; if the headway continues to decrease when the red light is on, it flashes, and if this is ignored the brakes are applied automatically. Failure detection.-If unit 8 senses lack of magnetron 4 output, switch 2 changes power to the other modulator 3 and magnetron 4; if the supply 1 fails warning signal 15 is operated. A testing arrangement is provided: a portion of the transmitted signal is leaked from the interrogator to the transponder and vice-versa, the circuit incorporating delay line 17 and gate 24; the delayed test signal from the interrogator causes a reply signal from the “own” transponder, unit 12 comparing the amplified reply signal with the interrogator signal as passed by gate 16 and if the transponder is not functioning satisfactorily the warning signal 15 is actuated. Further failure detection units 29, 30 operate a warning signal 31 if the transmitter or receiver respectively of the transponder fail: signal 31 also causes a transmitter 38 to radiate a signal to cause respective displays 18 of nearby omnibuses to warn of the proximity of a vehicle with a faulty transponder. Coding and traffic arrangements. Fig. 2.-In order to cater for a plurality of traffic lanes, each lane (e.g. main highways ME, MW, sidings SE, SW and lanes PE, PW between stations and public highways) has a separate radar pulse code and a further code is provided for fixed transponders at merge points P 2 , P 3 , P 7 ; the coding is r spaced pulses for the rth. code, the 7-pulse code being for actuating the fixed transponders. The transponders on vehicles operate on the same code as vehicles in the same lane but transmit back to their interrogators only a single pulse following the last code pulse, the interval between the latter and the returned pulse being utilized as a measure of the headway. A track transponder always responds to interrogation by a single pulse after the last code pulse. To warn a vehicle of the necessity to change its radar code when changing lane, and to warn of approach to a merge or diverge point, coded sets of magnets in the tracks are provided: e.g. if approaching diverge point P 1 a blue light is produced in the cab and if proceeding along lane ME a second magnetic code switches off that light, but if the driver wishes to go along siding SE, he biases an appropriate switch so causing the radar code to alternate between those appropriate to ME and SE, and after passing P 1 a magnetic code changes the radar code to SE and switches off the blue light.
GB5784366A
1966-12-24
1966-12-24
Improvements in or relating to vehicle monitoring systems
Expired
GB1213630A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB5784366A
GB1213630A
(en)
1966-12-24
1966-12-24
Improvements in or relating to vehicle monitoring systems
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB5784366A
GB1213630A
(en)
1966-12-24
1966-12-24
Improvements in or relating to vehicle monitoring systems
Publications (1)
Publication Number
Publication Date
GB1213630A
true
GB1213630A
(en)
1970-11-25
Family
ID=10480154
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5784366A
Expired
GB1213630A
(en)
1966-12-24
1966-12-24
Improvements in or relating to vehicle monitoring systems
Country Status (1)
Country
Link
GB
(1)
GB1213630A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2222710A
(en)
*
1988-09-09
1990-03-14
John Home
Vehicle monitoring systems
WO2010047588A1
(en)
*
2008-10-20
2010-04-29
Stichting Noble House
A method for determining the presence of a transmitter and a receiver in a vehicle and a system designed for carrying out the same
1966
1966-12-24
GB
GB5784366A
patent/GB1213630A/en
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2222710A
(en)
*
1988-09-09
1990-03-14
John Home
Vehicle monitoring systems
WO2010047588A1
(en)
*
2008-10-20
2010-04-29
Stichting Noble House
A method for determining the presence of a transmitter and a receiver in a vehicle and a system designed for carrying out the same
US8953151B2
(en)
2008-10-20
2015-02-10
Stichting Noble House
Method for determining the presence of a transmitter and a receiver in a vehicle and a system designed for carrying out the same
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Legal Events
Date
Code
Title
Description
1971-05-19
PS
Patent sealed
1973-06-06
PLNP
Patent lapsed through nonpayment of renewal fees
