This paper presents two novel six-axis magnetic-levitation (maglev) stages capable of nanoscale positioning. These stages have very simple and ompact structures, which is advantageous to meet the demanding positioning requirements of next-generation nanomanipulation and nanomanuacturing. Six-axis motion generation is accomplished by the minimum number of actuators and sensors. The first-generat...

A number of GPS augmentation systems have recently been developed for different applications in various regions. The manufacturers of these commercial services claim decimeter or near-decimeter level (1σ) horizontal positioning precision. These systems provide different types of correction and integrity signals to users via satellite links. Three services were studied: the NavCom Technology, In...

INTRODUCTION Precision positioning systems are essential in precision industry. These positioning systems often have one or more elements that introduce friction. Friction is well known to cause steadystate errors and limit cycles, and to slow the motion of the mechanism. Thus, it is important to consider friction compensation in controller design. Simple controllers like PID controllers do not...