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.
The system has been in continual use since 2001 with an excellent reliability record.
Identical equipments are still in production.
Frequency | 1 to 31 GHz bands |
Transmission | Analogue FM (PAL or NTSC) or Digital DVB-T |
Diversity | Space diversity as standard |
Analogue video channels | 2 at 1 GHz, 20 at 31 GHz |
Digital video channels | 8 at 1 GHz, 75 at 31 GHz |
Simultaneous Videos | 1 or 2 |
Analogue System Range | Up to 200 metres |
Digital System Range | Up to 700 metres |
Availability | 100% in all weathers |
Signal to Noise | 50 dB |
Video quality | CCIR grade 4 installed |
Operating Temperature | -20C to +70C |
Radio Specifications | ETSI EN 300 632 or equivalent |
Railway Specifications | RIA12, RIA13 and RIA20 |
Sealing - Trackside Units | IP66 |
Sealing - Trainborne Units | IP55 |
EMC Specifications | ETSI EN 300 339 |
RF Hazard | None - safe all distances |
Frequency | 1 to 24 GHz bands |
Video channels | 8 at 1 GHz, 30 at 24 GHz |
Simultaneous Videos | 1 per carriage |
System Range | Up to 30 km LoS and 2 km NLoS |
Availability | 100% in all weathers |
Signal to Noise | 55 dB |
Video quality | CCIR grade 4.8 installed |
Operating Temperature | -20C to +70C |
Radio Specifications | ETSI EN 300 632 or equivalent |
Railway Specifications | RIA12, RIA13 and RIA20 |
Sealing - Trackside Units | IP66 and IP67 |
Sealing - Trainborne Units | IP55 |
EMC Specifications | ETSI 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.
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.
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.
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.
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.
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.
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.
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