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whether the TETRA network is a valid alternative to
improve the reliability of the positioning system. For
this, a series of tests were done. The tests have been
focused on measuring the delay in sending the
position from the trains to central control. It has also
been counted the number of messages sent
successfully.
The results of the tests confirmed the initial
hypothesis. Therefore, TETRA technology is a good
alternative to increase the coverage of the
communications architecture.
In the future, efforts will focus on the integration
of the TETRA network in the current
communication system. To do this, we must modify
both the hardware and software of the
communications architecture. On the one hand, we
must connect two new TETRA stations to the router
that manages the communications between the train
and the control center. On the other hand, we must
define a scheme for selecting the right
communications technology (GPRS/3G or TETRA)
according to the existing coverage.
ACKNOWLEDGEMENTS
This work would not have been possible without the
collaboration of EuskoTren (which is a railway
company operating in the north of Spain), and
without funding from the industry department of the
Basque Government.
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