The idea of this book on Sensor fusion and its Applications comes as a response to the immense interest and strong activities in the field of sensor fusion. Sensor fusion represents a topic of interest from both theoretical and practical perspectives. The technology of sensor fusion combines pieces of information coming from different sources/sensors, resulting in an enhanced overall system performance with respect to separate sensors/sources. Different sensor fusion methods have been developed in order to optimize the overall system output in a variety of applications for which sensor fusion might be useful: sensor networks, security, medical diagnosis, navigation, biometrics, environmental monitoring, remote sensing, measurements, robotics, etc. Variety.