Abstract:
There is a great potential of wireless sensor networks in real time monitoring of
disaster prone areas. The present work focuses on specially designed
communication link establishment for the first 72 hours just after disaster,
highlighting the capability of wireless sensor network especially in disaster prone
area. The complete network consists of wireless nodes with integrated Xbee as a
sensor to establish a communication link in between the pursuit (rescue) team and
trapped people post disaster. Focusing on post disaster condition, the localization
is done by unilateral algorithm which has an advantage over trilateration
algorithm to help in localization of trapped people. The unilateral technique uses
the state of the art VPM (Vector Parameter based Mapping) protocol to track
trapped people from communication deprived area. Several tests have been
performed on a designed test bed to find the location of trapped node. The results
obtained from network are very encouraging as the trapped nodes are fully
discoverable using a hybrid model having RSSI (Remote Signal Strength
Indicator) as a key component. To optimize the unilateral method hybrid TLBO –
unilateral method have been used. The localization of the anchor node (fixed
node) by pursuit nodes (movable node) in outdoor location has been studied by
performing two experiments. The first method is based on LNSM (Log Normal
Shadowing Method) technique to localize the anchor node and the second method
is based on Hybrid TLBO (Teacher Learning Based Optimization Algorithm)-
Unilateral technique. In the first approach the ZigBee protocol has been used to
localize the node, which uses RSSI (Received Signal Strength Indicator) values in
dBm. LNSM technique is implemented in the self-designed hardware node and
localization is studied for outdoor location.
