FEEIT WSN Testbed: Effective System for Providing Emergency Situations’ Prevention and Surveillance - Application and Multidisciplinary Aspects of Wireless Sensor Networks - page 240

Fig. 11.9 Network architecture

Fig. 11.10 GUI display of the sensors' values in passenger train

11.3.4 Railway Sensor Network: Secure Transport

The scenario for the Railway Sensor Network: Secure Transport is related to a
monitoring system for railway vehicles. The system monitors the conditions of the
critical components for the safety and comfort of the passengers as well as for the
safety of the freight trains. The relevant parameters of interest are then wirelessly
transmitted to the data acquisition center that can be placed either in the locomotive
cab or in some ground station. The wagons' monitoring system comprises a wireless
sensor unit (Sun SPOT) connecting various analog sensors (light [ 10 ], temperature
and humidity [ 5 ], motion [ 4 ], sound [ 7 ], smoke [ 9 ]) that sense different parameters
and transmit gained values to the Base Station. The BS is connected to a local host
machine (PC) that retransmits the data through a particular wireless communication
device to the distant database. The employed wireless devices are Xbee PRO rf
modems (ZigBee [ 15 ]), HPS120 (Bluetooth [ 16 ]), and Avisaro (WLAN [ 17 ])). The
overall network architecture is depicted in Fig. 11.9 .
Figure 11.10 shows the scenario's GUI display with the real-time values of the
sensors parameters deployed in the passenger train.