Ogier Electronics

System Options

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.



Alternate Technologies

System Description