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Satellite systems play an important role in current global communications. New generations of satellite systems can utilize so called multilayered configurations where satellites among various layers (orbits) are interconnected to increase a capacity of overall system. Such satellite systems need to find optimal protocols (e.g. routing protocols) and optimal number of interlayer links. In this paper,...
Two-way satellite time and frequency transfer (TWSTFT) is one of the most precise and accurate long-distance time transfer techniques nowadays. A C band multi-station satellite tracking system is developed based on TWSTFT in China. This system can not only measure the distance between a satellite with transponders and earth stations, but also realize the time synchronization between all earth stations...
Precise point positioning (PPP) software combines dual frequency code and phase GPS observation data with precise information about the satellite clocks and orbits provided by the International GNSS Service (IGS). It is also a very interesting method for time metrology. Error sources like tropospherical path delay and site displacements have to be modeled or estimated, while the error induced by the...
Attitude control system is designed to change the attitude of a satellite, able to meet pointing requirement, eliminating external disturbances, a low-cost controller as well as a high reliability control system which can be applied and embedded to a real time application. An adaptive predictive Mamdani fuzzy logic controller (FLC) is introduced in this paper. A predictive control is needed to estimate...
Satellite systems are part of the global communication system and considerable differ from ground communications networks (such as fixed, mobile, and wireless data networks) mainly in a quality of transmission links. From transmission delays point of view the low earth orbit satellite systems (from all satellite systems) can only compete with ground systems. This contribution is oriented into the...
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