In view of the issue of rapid attitude maneuver control of agile satellite, this paper presents an attitude-tracking control algorithm with path planning based on the improved genetic algorithm, adaptive backstepping control as well as sliding mode control. The satellite applies double gimbal control moment gyro as actuator and is subjected to the external disturbance and uncertain inertia prop...

The paper outlines orbit and attitude control problems of a long-distance two-satellite drag-free formation for the Earth gravity monitoring. Modeling and control design follows the Embedded Model Control and shows how disturbance dynamics and rejection are mandatory. Orbit and attitude control can be treated separately except in the thrust dispatching law of the all-propulsion actuation. Orbit...

Attitudes influence behavior towards urban green spaces. But determining attitudes toward urban green spaces is not well operationalized in urban planning research. A study was conducted in the West Island, Montreal, Canada to elaborate the design and development of a valid and reliable instrument to measure the dimensions of citizen attitudes toward urban green spaces. The use of qualitative a...

Some problems on guidance and robust gyromoment attitude control of agile spacecraft for remote sensing the Earth surface are considered. Elaborated methods for dynamic research of the spacecraft programmed angular motion at principle modes under external and parametric disturbances, partial discrete measurement of the state and digital control of the gyro moment cluster by the few-excessive gy...

This note is devoted to deriving the measurement update of the geometric extended Kalman filter using the multiplicative extended Kalman filtering approach, resulting in the attitude estimator referred as geometric multiplicative extended Kalman filter. The equivalence of the derived geometric multiplicative extended Kalman filter and geometric extended Kalman filter is also demonstrated in thi...

Photoemissive image devices are very useful for low-light applications because of their inherent high quantum efficiency. This paper describes some of the characteristics of a sensitive television camera utilizing the recently developed Secondary Electron Conduction tube. The camera is being considered for a variety of low-light applications, including night-time meteorology and precise attitud...