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Track To Train CCTV System

Our proven microwave system transmits high-quality dynamic images from the platform CCTV cameras to drivers of Driver Only Operated (DOO) trains as they approach and leave stations.  In-cab monitors clearly show the entire length of the train and platform interface until the whole train has safely departed the station.  The system is suitable for surface, sub-surface and underground railways.

MTR trains
  • High quality videos - no compromises on resolution or frame rate.
  • Picture quality guaranteed using quantifiable measured parameters.
  • Space diversity with separate antennas ensures best signal is processed.
  • Videos guaranteed to be interference free.
  • No critical installation requirements or adjustments.
  • System not susceptible to environmental contamination.
  • System positively eliminates any possibility of cross-talk between tracks.
  • No need for any manual controls.
  • All equipment can be fitted in or around the station area.
  • Nothing has to be fitted close to the track - not vulnerable to damage.
  • No routine or scheduled maintenance required.
  • Simple depot checks for train-born equipment.
  • Full status information available for all platform equipment.
  • Flexibility for special requirements such as left/right door opening.
  • Spare channel capacity for two way video and data transmissions.
  • Optional simple redundant configuration available for the platform units.

The system has been in continual use since 2001 with an excellent reliability record.
Identical equipments are still in production.

LUL train

Track-to-Train

Frequency1 to 31 GHz bands
Transmission Analogue FM (PAL or NTSC) or Digital DVB-T
DiversitySpace diversity as standard
Analogue video channels2 at 1 GHz, 20 at 31 GHz
Digital video channels 8 at 1 GHz, 75 at 31 GHz
Simultaneous Videos1 or 2
Analogue System RangeUp to 200 metres
Digital System RangeUp to 700 metres
Availability100% in all weathers
Signal to Noise50 dB
Video qualityCCIR grade 4 installed
Operating Temperature-20C to +70C
Radio SpecificationsETSI EN 300 632 or equivalent
Railway SpecificationsRIA12, RIA13 and RIA20
Sealing - Trackside UnitsIP66
Sealing - Trainborne UnitsIP55
EMC SpecificationsETSI EN 300 339
RF HazardNone - safe all distances

Train-to-Track

Frequency1 to 24 GHz bands
Video channels8 at 1 GHz, 30 at 24 GHz
Simultaneous Videos1 per carriage
System RangeUp to 30 km LoS and 2 km NLoS
Availability100% in all weathers
Signal to Noise55 dB
Video qualityCCIR grade 4.8 installed
Operating Temperature-20C to +70C
Radio SpecificationsETSI EN 300 632 or equivalent
Railway SpecificationsRIA12, RIA13 and RIA20
Sealing - Trackside UnitsIP66 and IP67
Sealing - Trainborne UnitsIP55
EMC SpecificationsETSI EN 300 339
RF Hazard None - safe all distances

There are several different options available to meet the diverse operational requirements that exist on railway networks.

Number of Videos

The system can transmit one or two video channels, each of which can be used to show split screen displays of several cameras.
Up to four cameras can be shown on a single screen, but there will inevitably be a loss of resolution as more cameras are used.
The system provides the highest possible level of quality, thereby reducing the loss of resolution to an absolute minimum when it is used in multiple camera configurations.

Coverage Area

The principle requirement is for the system to provide pictures over a distance of around 100 metres when the train is leaving the platform until either the last part of the train has left the platform or until a point is reached where the operator cannot do anything even if he sees a problem.
In most cases a single transmitter will be sufficient to provide the coverage. However, if required, additional transmitters can be installed to increase the coverage, either before or after the primary coverage area.

Digital or Analogue

Either digital DVB-T or analogue PAL FM can be deployed. Both provide broadcast quality video.
Digital modulation is preferred if long range transmission is required and there are many non line of sight conditions.
There is however some latency due to the processing but this is reduced to less than 50 mS.
Alternatively, if the ranges are moderate and there is generally a line of sight, analogue is recommended because there is no latency and no loss of resolution.

Choice of Frequency

Variants of the system can be supplied to enable operation in all the licenced bands up to 31 GHz. Thus, unlike Wi-Fi or Wi-Max based systems that operate in the public, licence exempt bands, the system can be guaranteed to be interference free, which is particularly important for a safety related application of this sort.

Two-Way System

We have trialled a two way system in underground and over-ground environments that allow bi-directional data transmission as well as videos from on-board cameras to be transmitted to a central control point.
Long transmission ranges have been demonstrated.
This together with trackside transceivers installed at convenient sites will enable the videos to be relayed to and from the trains using the existing fixed infrastructure where it is available.
The unique feature of this system is that it provides high data rates using Ethernet interfaces using the licenced frequency bands to ensure interference free operation.
If you have a specific requirement or would like to discuss the system with us, please do not hesitate to contact us.


Applications

  • Underground Railways
  • Metro Systems
  • Mainline Trains
  • Trams
  • Light Rail
  • DOO Driver Only Operations
  • DCO Driver Controlled Operations
  • OPO One Person Operated trains
  • OMO One-Man Operation

Advantages

Unlike platform mirrors or fixed monitors, the in-cab display means the driver can keep watching until the entire train has left the platform.


On curved platforms the cameras can be arranged to give complete coverage.
On some of the oldest London Underground platforms where there are significant curves our system uses 8 simultaneous live video feeds to provide 100% coverage.


Unlike On-Train Camera/Monitors (OTCM), fixed platform camera are always optimised for the platform dimensions.
Fixed cameras do not suffer from vibration like trainborne cameras and can use larger high quality lenses and sensors for excellent video clarity. Platform cameras are positioned to avoid glare from platform lighting and signals.


Driver is directly "in the loop" for fastest response to incidents.


Microwave video transmission system is extremely robust and reliable.


Visual check with live video instantly shows if object trapped in doors, unlike door obstacle detection systems that are not always able to detect small objects.

Image Gallery

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In-cab CCTV monitors in use by driver
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London Underground S-Stock cab showing CCTV monitors
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Trackside equipment typical install
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Trainborne receiver unit
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Trainborne antenna assembly
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Trackside equipment installed for London Underground
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Hong Kong MTR train utilising Ogier Electronics equipment
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Trackside power control unit
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Video transmitter unit
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Trackside transmitter equipment installation

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