In recent years, advances in signal processing have led to small, low power, inexpensive Wireless Sensor Network (WSN). Target localisation and tracking problems in WSNs have received considerable attention recently, driven by the necessity to achieve higher localisation accuracy, lower cost, and the smallest form factor. This book includes five studies. The first study leads to the design and implementation of a triangulation-based localisation approach using RSS technique for indoor tracking applications. The second study concentrates on investigating a fingerprinting localisation method...