In this contract the modernization of live training requires accurate dismounted soldier trainee position/tracking to enable the convergence of Live, Virtual, and Constructive (LVC) training environments. The position jitter or the random position changes make the training unreliable under the condition of GPS satellite signal attenuation or blockage. In this project, a novel artificial neural network based pedestrian dead reckoning navigation system is proposed to upgrade the real-time navigation information accurately even in a variety of challenging terrains