In recent years, several progressive studies promote the development of aerial tracking. One representative is our previous work Fast-Tracker which applicable to various challenging tracking scenarios. However, it suffers from two main drawbacks: (1) oversimplification in target detection by using artificial markers and (2) contradiction between simultaneous environment perception with limited ...

Mobile satellite antennas are gimbal-mounted with an active control system to keep the antenna pointed at the target satellite. Short time-scale antenna stabilization is achieved with gyroscope feedback. Long time-scale tracking of the satellite is maintained by scanning the antenna: The beam is intentionally nutated and the resulting change in signal strength is used to estimate how well the a...

Abstract With the rapid development of unmanned aerial vehicle (UAV) technology, there are more and fields UAV application. This research mainly discusses patrol path planning based on machine vision multi-sensor fusion. article studies how to apply ultrasonic, a classic ranging sensor, obstacle avoidance UAVs. The designed ultrasonic system is complete set hardware software systems. part consi...

BACKGROUND Our purposes were to compare between the original and current recommended standard methods of three-dimensional scapular rotation descriptions and to examine the prevalence of gimbal-lock for scapular motion during scapular plane abduction. Additionally we compared these standards to an alternative method and a glenoid based description. METHODS Eleven asymptomatic subjects were st...

Control laws for an integrated power/attitude control system (IPACS) for a satellite using variable-speed singlegimbal control moment gyroscopes (VSCMGs) are introduced. Whereas the wheel spin rates of the conventional CMGs are constant, the VSCMGs are allowed to have variable speeds. Therefore, VSCMGs have extra degrees of freedom and can be used to achieve additional objectives, such as energ...

The Short-Haul-Civil-tiltrotor (SHCT) component of the NASA Aviation System Capacity Program is an effort to develop the technologies needed for a potential 40-passenger civil tiltrotor. The variable diameter tiltrotor (VDTR) is a Sikorsky concept aimed at improving tiltrotor hover and cruise performance currently limited by disk loading that is much higher in hover than conventional helicopter...