Case Study Sector Transportation
Train Driver Subway
Platform Display:
Seoul
Requirement
The project requirement was to ensure that the
train driver has a visual display of the approaching
platform some 300 metres before arrival at the start
of the platform. All stations are built on a curve and
for safety reasons the driver must ensure that the
platform edge is clear prior to arrival.
The Solution
Wavesight developed a bespoke solution combining a
video codec and 2.4GHz radio, based around existing
Wavesight products. This product was manufactured
and supplied as a module for integration into other
systems.
A systems integration company, Eltronix, based in Seoul, won a
contract for the Seoul Subway for CCTV systems both on and off
trains. The compact nature of the integrated product was a key
feature in the selection of the Wavesight solution.
Following extensive trials and tests the product was adopted for
use within the Seoul subway railway system.
These tests included testing the propagation of the RF signal
within the tunnels and the high data rate required for the CCTV
transfer.
Platform viewing
The platform CCTV camera video signals are fed to a Wavesight
unit located on the platform. This then relays the video signal to
two other Wavesight units; one located at the tunnel entrance
and the other at the tunnel exit.
On a display screen located in the train driver cab, the driver can
see the platform from a point 300metres prior to arrival, whilst
stationary and for 300metres after leaving the platform. Any loss
of picture (out of range) results in a black screen to avoid any
worries of an old or still frame.
The network identifiers are arranged so that the approaching
train can only see the relevant platform and not an adjacent
one.
Extensive testing
Wavesight spent a considerable amount of time supporting
the exhaustive test procedures and extensive trials required to
ensure this system worked according to the customer’s exact
requirements.
Eltronix have subsequently proposed similar solutions to other
railway networks.
Communication innovation
www.wavesight.com