Diagnosing Parkinson's disease (PD) is often difficult, especially in its early stages. It has been estimated that nearly 40% of people with the disease may not be diagnosed. Traditionally, the diagnosis of Parkinson’s disease often requires a doctor to observe the patient over time to recognize signs of rigidity. In this work, we propose a PDR-based method to continuously monitor and record th...

Collaborative Virtual Environments (CVEs) are real-time applications that require a high degree of responsiveness to maintain an immersive end-user experience. Because of latency and unpredictability in best-effort networks, dead-reckoning algorithms are routinely used to estimate the position of objects within the virtual space. Although traditional forms of dead reckoning work well for applic...

Radio frequency (RF) indoors localization is adopted by automated guided vehicles (AGVs) positioning due to availability of communications framework sub-system (e.g. ZigBee wireless network) in the entire working system. AGV (i.e. a type of wheeled mobile robot) communications sub-system can therefore support RF localization hardware without additional cost. Mobile communications for indoors en...

(ABSTRACT) Students at Virginia Tech have been developing autonomous vehicles for the past five years. The purpose of these vehicles has been primarily for entry in the annual international Intelligent Ground Vehicle Competition (IGVC), however further applications for autonomous vehicles range from UneXploded Ordinance (UXO) detection and removal to planetary exploration. Recently, Virginia Te...

The related fields of mobile robotics and ground vehicle localization lack a linearized theory of odometry error propagation. By contrast, the equivalent Schuler dynamics which apply to inertial guidance have been known and exploited for decades. In this paper, the general solution of linearized propagation dynamics of both systematic and random errors for vehicle odometry is developed and vali...

Rats organize their open field behavior into a series of exploratory trips focused around a central location or home base. In addition, differences in movement kinematics have been used to fractionate the exploratory trip into tour (i.e., sequences of linear movement or progressions punctuated by stops) and homeward (i.e., single progression direct to the home base) segments. The observation of...

The related fields of mobile robotics and ground vehicle localization lack a linearized theory of odometry error propagation. By contrast, the equivalent Schuler dynamics which apply to inertial guidance have been known and exploited for decades. In this paper, the general solution of linearized propagation dynamics of both systematic and random errors for vehicle odometry is developed and vali...

Existing localization techniques have fundamental limitations which make deployment under commonly encountered conditions difficult. Techniques used to augment GPS generally require specialized infrastructure, tedious calibration tasks, or other requirements that make general purpose application difficult, yet may still be unreliable in practice. In this paper, we examine the utility of coopera...

As positioning solutions integrate multiple components to improve accuracy, the number of parameters that require calibration has increased. This article studies a calibration-free technique using Wi-Fi ranging and pedestrian dead reckoning (PDR), where every parameter in system is optimized real time. significantly decreases time effort required perform manual procedures enables solution achie...